What to do if usb. The computer does not see USB devices, what should I do? Repair of computers and laptops. Data error message

In case you are getting USB Device Not Recognized error every time you plug in a USB keyboard or mouse, you can use the methods below to fix such an error in Windows 10.

USB Device Not Recognized Error in Windows 10

The error is not only noticed when connecting new USB devices, it can also appear when USB devices, such as a keyboard or mouse, are already connected to the computer.

Regardless of the situation when such an error occurs, you have the option to fix it using one of the following methods.

Disconnect the USB device and restart your PC.
Disconnect the power cable from the computer.
Update your device drivers.
Check for updates.
Disable the USB Port Temporary Disable Option.
Change the power plan setting.
Remove faulty device drivers.

Make sure you don't skip the first and second methods, which are listed below.

1 Disconnect the USB device and restart your PC

Disconnect all USB devices, and then restart your computer.

Once the computer restarts, plug the USB device back into the same USB port that did not recognize it. If this doesn't work, try connecting the device to a different USB port on your computer.

2 Unplug the power cable from the computer

The reason for the unidentified device error in Windows 10 could be because your PC is facing minor software glitches.

To fix it, simply turn off your computer and also disconnect it from the power source. Wait 5 minutes and restart your computer.

Sometimes this simple step can resolve the error.

3 Update your device drivers

Your Windows computer should automatically update software for all device drivers. However, this may not always happen, causing device drivers to become outdated.

After installing the updated driver, check if your computer can recognize the USB device.

4 Check for Updates

Check to see if updates are available for your computer. If updates are available, Windows will also install the latest available drivers for your computer.

In case updates are available, latest updates Device drivers will also be installed on the computer.

5 Disabling the USB Port Temporary Disable Option

By default, Windows computer configured to conserve energy by suspending power to external USB devices while they are inactive. However, this energy saving setting can lead to problems, such as error Code 43 or USB device Not Recognized error in Windows 10.

6 Change power management settings for USB root hub

In case you have many USB ports, you need to do these steps for each of them.

Note: If this step does not help, you can return the checkmarks in the line Allow the computer to turn off this device to save energy.

7 Remove faulty device drivers

The error issue may be due to faulty, corrupted or missing device drivers.

This can be resolved by removing faulty device drivers and allowing Windows to automatically reinstall them on your computer.

Note: In rare cases, Windows may fail to install Device Drivers and you will be left with no working USB ports.

Once your computer restarts, Windows will automatically load necessary drivers on PC.

Over the past few years, flash storage media have become very popular and are used by us literally every day, due to their advantages over disk media. It is hardly possible to overestimate its usefulness as a flash drive, because you can quickly record or read information on it, it does not take up much space in a briefcase or bag, and the price segment is pleasantly pleasing.

Despite all the positive aspects, sometimes there are situations when it is impossible to read the data due to the flash drive or computer itself. After all, at the very important point you may lose access to stored files, and to quickly return everything to normal you need to have certain knowledge. In this article we will analyze all possible problem situations and find ways to solve why the computer does not see the flash drive.

The most common problems why the computer does not see the flash drive:

The flash drive itself does not work

This is the worst situation for a person whose documents are stored on a flash drive, because it is almost impossible to bring it back to life. A flash drive can be damaged by mechanical impact on the device chip or its controller, by shorting electrical circuit, damaged contacts on the USB board. This is what a flash drive looks like after the electrical circuit is closed or moisture gets inside the drive.

It is quite easy to determine whether this happened to your drive. The very first thing you need to do is check the flash drive for mechanical damage, chips, cracks, etc. If it is completely broken, you can look for a replacement in the store. computer peripherals. If you doubt its inoperability, you can check it using a practical method.

Connect the flash drive to the USB connector of the computer, if the LED on it lights up and you hear a sound on the computer that is typical for connecting a new device, then everything is in order, it makes sense to look for the problem further. If this does not happen, the flash drive is most likely no longer suitable for use.

You can try to take the flash drive to service center, where the technician will try to resolder the contacts or replace the controller, but it will be very expensive, and this action will be justified only if you store important documents on it. If no fatal malfunction was detected and the flash drive shows signs of life, try the methods to restore its functionality, which will be described below.

The USB port on the front panel of the computer is de-energized

This problem is very common among desktop PC users. Most computer owners are accustomed to inserting a flash drive into the front USB ports, because it is fast and convenient.

But there is a situation when, during PC assembly, for some reason the front panel is not connected to the power system; usually this happens due to the forgetfulness of the computer technician. Accordingly, your flash drive will not be displayed, despite its full serviceability.

This problem can be solved in two ways. If you urgently need to use information on removable media, you can connect it to the back panel of your computer. The front connectors will still remain inoperative, but you will have access to documents. Such manipulations cannot be called a full-fledged solution, so let’s consider the second option.

Method No. 2 involves connecting the power cable to motherboard to the front panel of the computer. Depending on the computer case model, the connection connectors may differ. But don’t be afraid, they all have markings and you won’t be able to connect the wrong connector due to design features. The most common wire types are “VCC”, “D-”, “D+” and “GND”. Moreover, the color markings of the cable and the connector on the motherboard are the same, but it is better to keep a guide by the inscriptions.

The first step is to gain access to the motherboard; to do this, unscrew the mounting bolts on the case and remove the cover. Find the cable that leads to the front panel and find the same connector on the motherboard. In the image below you can see what the connector should look like.

It is not recommended to make the connection yourself; it is better to call a specialist. If you connect the cable and connector incorrectly, you can burn these contacts and even devices. If you decide to connect front USB connectors, then it is better to tell us the model of your case and motherboard, and we will tell you how to do it correctly and explain what the connector and cable look like.

The USB port on the computer is faulty or disabled

Sometimes the problem of unreadability of information on removable media is not related to the problem of the flash drive itself, but to the connector into which it is connected. Definite USB port may not be working, and this condition can be caused by simple damage to the connector contacts. Then not only the flash drive, but also other USB devices will not work in this port.

Decide this problem you can, armed with a regular soldering iron and minimal knowledge of circuit design. If you don’t have such knowledge, skills and equipment, then it can be fixed at the nearest service center for a low fee.

However, if there is no reaction to USB connection device is not observed on all connectors, then the problem may lie deeper. Ports can be disabled in BIOS settings.

To connect ports to BIOS menu, you need to get there initially. To enter the BIOS in the first seconds of booting the computer, you need to press the corresponding key on the keyboard, which is responsible for calling up the menu. Most often, the default key is F2 or Del, but depending on the motherboard brand and BIOS version, it may be different. It is indicated in the first image that pops up when loading.

After you have entered the BIOS itself, we need to go through the following route: “”.

Find the line “USB Controller”, so that you are allowed to use the ports, the value opposite should be “Enabled”.

Once you have enabled the USB ports on your computer, press the F10 key. This will save your settings and exit the BIOS.

The USB flash drive connector is dirty

Flash drive is mobile device storing information and is therefore often carried in pockets, briefcases or as a keychain. Due to such operating conditions, dust and small debris may accumulate in the connector. This does not happen often, but it can cause the flash drive to malfunction. Dust and small debris accumulate on the contact and prevent connection from the contacts to the port on the computer. Such a flash drive may not only not be displayed at all, but also freeze, transfer or read information slowly and may not be detected the first time.

To clean the USB connector of a flash drive, arm yourself with a match and a cotton swab. Using a match, remove all debris from the connector, and then moisten a cotton swab with alcohol and wipe the contacts of the flash drive. This way you will rid it of debris and oxidation.

Virus infection

Nowadays, the issue of storage device security is becoming more and more urgent, because viruses are in full force. You can visit your usual site social network on the Internet and get infected, not to mention downloading files from unverified sources.

Modern computer viruses They can also reproduce, no matter how strange it may sound. They infect files located on your flash drive or computer hard drive, and their number grows exponentially.

Very often, the problem of a flash drive not working is infection with viruses. The drive is detected by the system, you can hear the characteristic sound of connecting the device to the system, but when you try to read the information, you will see the message “” or “ Application not found».

Before solving this problem, you should install anti-virus software on your computer and conduct a full diagnostic of the files. To access the data on the drive, we need to delete the file with the virus and scan it. To do this, go to the “Start” menu and enter the following phrase “” in the search line.

Click on the found element with the left mouse button. You will see an open window called “Folder Options”, here you need to do the following:

Uncheck the " Hide protected system files»
Check the box ""

After this, be sure to press the “Apply” button and only after that “Ok”, otherwise the changes will not take effect. It should look like this.

After that, go to “My Computer” and go to the folder of the drive itself. There you will see the “Autorun” file, you need to delete it, and check the flash drive for viruses with one of free antiviruses, the Dr.WEB Cure It utility can handle this perfectly.

Now you can fully use the flash drive and no problems should arise. If nothing has changed, then the problem lies in the lack of drivers; we’ll look at it below.

Drivers failing or using outdated drivers

A very common problem is when the computer does not want to display the flash drive due to outdated drivers or their system failure. The failure may occur due to a power surge or unexpected shutdown of the operating system. Or older computer models may not work with drives with a capacity of 32 GB or more. One thing can be said, the problem can only be solved by updating the drivers.

The first thing you need to do is go to "". You can do this in several ways, for example, through “ My Computer" or find this section in the system search, which is what we will do.

Let's go to this menu, after which we connect the flash drive to the computer, after which we open the “USB controllers” subtab. Select the line " Memory", right-click to open the system menu and click “Delete".

Such manipulations allow you to remove the drivers installed on the system for your storage device. As soon as you remove it, feel free to remove the flash drive from your computer and connect it again. Then the driver for the flash drive will be installed again and the problem will be solved.

If the problem is not solved, you may need to update the drivers for all USB chipsets; this is quite easy to do. You can use the special disk that came with the motherboard, it contains all the necessary drivers. If you don’t have it, download the DriverPack program, it will automatically select all the drivers for which there is an update and carry out this procedure after your agreement.

Moreover, most users have doubts about the correctness of their actions when they learn about the different USB formats. Don't be scared!

Drivers for USB 2.0 and USB 3.0 are installed according to the same principle. And the only difference between the ports is maximum speed reading and writing information.

File system errors

The computer may also not recognize your flash device due to file system errors. Let’s check if this is true, go to “”, how to do this was described above. Now you need to open the subtab " Disk devices“If you see your flash drive there, it means it is working, and the file system does not perceive it as it should, and, accordingly, does not display it in Explorer. In my case, the flash drive was displayed, which means it is working.

To fix this problem, you must format your flash drive, but this action has several nuances, so we will consider this process in the next paragraph of the article.

If you don’t see your drive there, then the problem lies in the malfunction of the flash drive itself, which means either the controller is burned out or the contact has become unsoldered. Specialists at service centers can try to bring it back to life. However, this is an expensive exercise; it’s easier to buy a new one, of course, if the faulty one was not recorded important information and you need to recover the data on the flash drive.

File system conflict

Quite often, the contents of a flash drive are not displayed due to a conflict between the file systems on the computer and the removable media itself. For example, if the computer operates on a file NTFS system and the flash drive uses FAT32, a conflict situation is possible. Moreover, this problem is common not only in Windows environment, but also Mac OS. For example, if you format a flash drive on your Mac device to ExFAT or the standard MacBook file system, the flash drive is unlikely to be readable on Windows devices.

The very first thing you need to do is find a computer that uses a different file system, open the flash drive and save the information that is important to you, because after formatting it will be lost.

To solve this problem, we need to carry out the process of formatting the flash drive. First you need to find out what file system is used on your computer. Go to “My computer”, right-click on the hard drive, open the submenu and select “Properties” in it.

In the window that opens you will see information about free and occupied volume disk space, and also find out what file system is used. In my case, the NTFS system is used.

After you know the computer's file system, we need to format the flash drive into the same system. To do this, right-click on the flash drive and open the “Format” tab.

In the tab that opens, select the file system into which we will format, check the box next to the “Fast” attribute and click “Start”.

A few words about why we use the “Fast” attribute. Firstly, formatting a flash drive will happen much faster. But there is another side to the coin. If there were any documents on the flash drive, then only with quick formatting will you be able to recover this data using special utilities. If you do not check the box, then the information that was on the flash drive will be lost forever.

The flash drive is not formatted

A fairly common problem is when you insert a flash drive into your computer (mostly a new flash drive and its first use), and the operating system gives you a warning that says that before using, removable disk needs to be formatted. And if the flash drive has been used before and there is data recorded on it, then there is no way to access it. Moreover, the volume of the flash drive becomes 0, i.e. as if there was nothing there at all, not even a storage device.

If you have already used a flash drive and this is not the first time you have connected it, then try connecting it to another computer, perhaps the problem will go away and you will be able to save the data. But in any case, the flash drive must be formatted. How to do this was discussed in detail in the “File system conflict” section.

But I want to draw your attention to two points. To avoid problems with the file system (FS) after formatting, find out what FS is used on the computer and install the same one for the drive. And second, if the flash drive had the information you needed, then be sure to use the “Quick” attribute, so the flash drive will be formatted only according to the table of contents, and the lost information can be returned using special utilities.

Problem with partition or flash drive automatically assigned a busy letter

There are situations when the operating system incorrectly detects your removable media. Everything seems to be fine, the device connection is displayed and a flash drive icon appears in the tray, but there is no way to use it for its intended purpose.

The problem may be that the system has not assigned the partition a letter under which the removable drive will appear, or it has assigned it, but this letter is already occupied, and this results in an address conflict.

The solution to this problem will be to force the assignment of the partition letter that we choose, everything happens in manual mode. So let's get started.

First of all, you need to hold down the key combination “Win + R", a window will open in front of you with the name “Run".

In the line we need to enter a simple command diskmgmt.msc, which will take us to the disk and storage management section.

In the storage media manager that opens, we need to identify our USB device. This can be done simply, disconnect the flash drive and connect it again, the partition that first disappears and then appears is what we need.

In my case, the flash drive is a drive with the name “20151114_17”, you can also identify it by a special icon. Now you need to right-click on it and select “Change letter” in the menu that opens.

Now one more thing will open before us additional window, smaller. In it you need to click on the button “Change” and “Ok”.

Now another auxiliary window will open, where you must select any letter of the English alphabet, and after clicking on the “Ok” button, the letter will be assigned to the section.

It is worth paying attention to one important point! When choosing a letter to assign to a partition of your flash drive, look at which letters are already in use by the system. This is very important, because we may not fix the problem, but leave it. This will happen if, for example, you designate a flash drive partition with the letter “D”, which is already assigned to the local disk.

Malfunction of the power supply or excessive current overload of the USB portal

This problem is very common these days. The fact is that the computer may simply not see the flash drive due to a faulty power supply. Let's look at it in order, the power supply consumes electrical energy from the network, and then converts and distributes it to all nodes of the computer. It has a power limit, for example, a 400W power supply will not be able to give you 600W. This means that the consumption of the entire system must be balanced.

This problem may appear if you have recently replaced some important component in the system, let it be the processor. Now it consumes much more energy compared to the past, which means it simply does not reach somewhere, and in this case this “somewhere” is USB network computer. Accordingly, the energy consumption parameter must be calculated in advance, and if such a situation has already occurred, you will have to replace the power supply with a more powerful one.

Moreover, the problem may lie in a malfunction of the power supply; it may produce much less power potential than stated and than it produced before. You will not be able to solve this problem, since you risk the performance of the entire computer. The only solution is to replace the power supply.

There is one more feature this issue. IN lately USB devices for computers have become very common, let’s say the following devices are now powered: a mat for warming a cup, desk lamp, wireless mouse, removable hard drive, and in addition, the smartphone is also charging. And you want to connect a flash drive, but bad luck, the computer sees it. The fact is that there was an overcurrent on USB ports. Those. all your devices are already consuming maximum quantity current and you cannot connect one more. Therefore, to use a flash drive, you need to disconnect several devices from the computer’s USB ports and then the problem will disappear.

If the computer does not see the flash drive in Windows XP

There are many reasons why a flash drive may not be detected in Windows XP. Moreover, the problem may lie in the operating system itself, or in a faulty flash drive, or even in the computer hardware.

If the problem is related to operating system, then it can only be eliminated by making additional changes in the settings; this is best done manually, despite the abundance of special utilities that can help in this matter.

However, if the drive itself is faulty, then the only thing you can do is try to save the data recorded on it. And after that, purchase a new and more reliable device.

If your computer cannot detect the flash drive, it notifies the user with the following signals:

Your flash drive is inserted and you try to access the data on it, the message “Insert disk” pops up.
The system notifies you that the drive must be formatted for further use.
Errors appear about the impossibility of gaining access to data.
The system may freeze as soon as you plug the USB flash drive into the computer's USB port.

In this section we will look at all the most common reasons for the non-functionality of a flash drive in Windows XP and give practical recommendations by their decision. Carefully read the description of the problem, if it is not similar to yours or its solution did not help you, move on to the next point until the problem goes away. The first thing you need to do is try to determine whether the flash drive is working. This is indicated by a light indicator located on it. If you connect the drive and it blinks or lights up, then the flash drive is working and the problem lies either in the system or hardware of the computer.

Try changing the port into which you connect the flash drive or even the computer; perhaps only the port or the entire system is faulty, but on another PC the flash drive will work properly. For example, if, when connecting a flash drive to a port, you observe a complete system freeze, this means this port is faulty and should not be used.

If you are using USB hubs or extension cables and the flash drive is not displayed, perhaps the problem lies in the device itself, and not the flash drive. If this turns out to be the case, you can take the hub to a service center or try to repair it yourself. To do this you will need a soldering iron, solder and a little experience, because most often you just need to solder one or two contacts and everything will work as expected.

Perhaps the problem lies in the lack of electric current in the USB port system. To check this, you need to disconnect all USB devices on the computer (camera, printer, lamp, etc.), leaving only the keyboard and mouse. If after such manipulations the flash drive appears in the system and you can access it, then the problem lies in a weak power supply. This problem can only be solved by replacing the power supply with a more powerful one, but using a USB hub with its own power source will help delay the purchase of a power supply.

However, if the problem is not resolved after disconnecting all other devices, the problem may still be related to the lack of power from the power supply and an outdated USB port. In other words, on older laptops you will not be able to open a flash drive with a capacity of 36 GB or larger. There is no way to solve the problem; you can only buy a more modern laptop or computer.

A very common situation occurs when the user connects a flash drive to the front port of the PC, but the system does not see it. This means that the ports are not connected to the power supply on the motherboard, or too little power is allocated to them. You can connect the front panel yourself using the instructions located above in the section of the same name.

Can't see the flash drive due to Windows XP errors. Troubleshooting

The flash drive may also not be detected due to operating system errors. For example, Windows XP SP2 lacks updates and software packages that provide normal USB operation devices. Moreover, it is possible that only several USB devices can work in one port.

The solution to this issue will be to update the system to SP3 and install the necessary updates. Even a new user can do this, since we only need a couple of clicks, and the system will automatically download, install and launch the update. So, let's get started, we can move in two ways - this is an official download from Windows Update or installing SP3 from a disk or flash drive. The first step is to check which package you already have installed.

Click on the “My Computer” icon with the right mouse button and select “Properties”. The following window will open in front of you, where information about your system will be indicated.

To install SP3, we need to allow the operating system to search and update the computer system. To do this, just go from the Control Panel to Windows Update.

As soon as you do this, the system will begin searching for updates, after which it will offer you to update everything at once or select only the ones you need. If you don't understand what update changes what, then it's better to let the system update completely.

After downloading all the updates, the operating system will require you to restart your computer to apply the new settings. Click “Ok” and wait patiently. That's all, now you can connect the flash drive and use it.

If you decide to choose which updates to install rather than download them all into automatic mode, then here is a guideline that will help improve your perception USB drives system.

Driver conflicts in Windows XP

There is also the problem of driver conflict. The fact is that some have already outdated drivers can cause errors at the system level, moreover, they can prevent the normal operation of new drivers. A striking example of such a problem is a situation when a user inserts a flash drive into a computer, tries to access the data on it, and the system immediately displays an error message asking to insert the disk. Or, the system simply freezes, and even assigning an existing letter to a flash drive partition is possible.

The reason for such errors is as follows. Let's say you have two flash drives, you connected one of them to the system. In automatic mode, all necessary drivers for this device are immediately installed. You're done necessary manipulations to write or read files and remove the drive. After that, you insert a second flash drive, which is completely working, and one of the above errors pops up. This means that the system is trying to use the already installed driver from the first flash drive to launch the second, but they are not compatible.

Reinstalling Windows XP drivers for USB devices

This problem can be easily resolved in several ways. Reinstalling drivers automatically or manually. Let's look at a little theory: a driver from one USB device can be mistakenly used by the system to launch another USB device. To eliminate these problems, we need to first remove all existing drivers for USB drives, and then reinstall them.

Such a problem may display the message “USB device not recognized,” or unexplained processes occur at the system level that block access to data or cause the system to freeze.

Remove via DriveCleanup

You can effectively remove all existing drivers for USB devices using the DriveCleanup utility. Its advantage is that it searches the entire system for installed drivers and only after that deletes them.

First of all, turn off the computer and disconnect all USB devices from it in order to avoid conflict situations while the program is running. Turn on the PC, go to the official website of the program and download the executable file. The utility is compatible with any version of Windows, including different bitmaps. When downloading, pay attention to the file version.

Automatic installation

You have removed all drivers from your computer. In order for a device to function normally, the operating system must have drivers for it. Process automatic installation The driver is incredibly simple, you just need to plug the USB flash drive into the USB port, after which the installation will begin immediately. A window will pop up that will display the installation progress; on some systems this may occur in a mode invisible to the user. Within one to two minutes, the installation will be completed and you will be able to use the device.

Manual installation

Under manual installation This means installing drivers not directly from the storage medium itself. We can also install drivers for a flash drive from third-party Internet resources, but to avoid conflict situations, we will install drivers for a flash drive using another computer.

So, we take our problematic flash drive and insert it into another computer, where it is recognized. A prerequisite for this process is that the versions of Windows on both computers match. We use the system search and find two files.

By any means we transfer them to problem computer, whether by mail or using other removable media. You need to place these files in a folder with the same path that was on the first computer and confirm the replacement when the corresponding window pops up. We reboot the computer and enjoy its performance with FLASH disks.

We looked at only the most common reasons why a flash drive is not visible on the computer. In fact, there are many more of them. Moreover, there are problems that are expressed by other system messages, and their solution is already described in the paragraphs of the article.

The “Insert disk” message appears even if the flash drive is already connected to the USB port

This system error occurs if the drivers overlap each other and interfere normal functioning USB devices. In order to fix this error, you need to remove all drivers for USB devices and install them again. This process is described step by step in this article.

Message about the need to format the disk

This message appears if you are using a flash drive for the first time or if it has experienced a system failure. In addition to the message, you can make sure that it is not suitable for use, because it does not display either free space or occupied space. The solution to this issue is described in detail in paragraphs 8 and 9.

Data error message

This problem occurs in 3 cases. This is a driver conflict, a file system conflict, and a failure of the flash drive itself. Solved by reinstalling the drivers, if that doesn’t help, then quick formatting to preserve the ability to recover data on a flash drive. Step-by-step instructions are above.

Complete system freeze immediately after connecting the flash drive to the computer

This issue has already been discussed in the article, but I would like to point out that this error can occur for two reasons:

Driver conflict.
Faulty port.

It’s easy to check what problem you have, insert the flash drive into another port, if the freeze continues, it means there’s a problem with the drivers. Instructions and tips for reinstalling them were given as part of this article.

Why does the computer not see the flash drive when the indicator on it is lit?

The contact on the flash drive, which is responsible for transmitting information, may be damaged. A driver conflict and the assignment of a busy letter to a partition cannot be ruled out. If the problem does not go away after connecting the flash drive to another computer, try checking the availability of the partition. If everything is fine here, then reinstall the drivers and the flash drive will work.

Error 43 / Error 43

This error immediately stops reading information from a removable device, which means we won’t be able to immediately access the data. There are several problems that can cause Error 43.

Malfunction of the device itself is the first of them. Check on another computer to see if this situation happens again.
Driver conflict - solution described above.
Updating the hardware configuration - simply roll back the driver version in the Task Manager.

Conclusions

We have reviewed in detail the reasons that may prevent a computer from reading a flash drive and the information on it. Described solutions with step by step instructions will definitely help you get rid of this problem. An unreadable flash drive can be a death sentence only if the flash drive is faulty. In other situations, this is an easily reversible process. If you have any questions or couldn’t find a solution to your problem in the article, leave a comment and we’ll try to clarify the situation together.

In progress computer equipment Various failures and malfunctions may occur from time to time. Many users often look for an answer to the question: why doesn’t the USB port see the device? In fact, connecting USB devices to your computer may not be detected by the Windows operating system due to an error occurring.

Who is to blame and what to do?

The first place to start to find out the reasons for this “behavior” of the system is to check the serviceability of the device connected to the computer. You can use another device for this.

If the error repeats on another computer, we can conclude that the cause is the connected USB device. Whether to send it in for repairs or buy a new one is a decision at your discretion.

One of the reasons for the error may be the presence of bad contacts. Long-term use of wired mice and keyboards is usually to blame for this. Repeated kinking of the cable can damage the inner wire and lead to this problem.

Very often the error occurs due to static electricity. USB devices are a kind of storage of electrical charge, so when they are connected to computers, an electrostatic field often arises and the voltage increases. In this case, the protection system is activated, and all ports for connecting USB devices are automatically disabled.

How to fix the problem?

There are several ways:

First of all, you need to disable computer device from power supply. If such a problem occurs with your laptop, you need to free it from battery. When the above steps are completed, wait 5-10 minutes, return the battery to the laptop, and connect the computer to the network. To your surprise, the ports will work!

You can use another method to solve the problem. If the error occurs due to several simultaneously connected USB devices, you need to disconnect them. Then the device that was not recognized must be connected to the computer again. As practice shows, this method is effective.

If the above methods do not provide the desired result, you can use another one. One of the reasons for the error may be incorrect driver installation. The problem can be resolved by disconnecting all USB devices from the computer ports. After this, you need to find Windows 7 C:\Windows\System32\DriverStore\. and delete the INFCACHE.1 file on your computer.

The next time you connect the flash drive, a new correct file with exactly the same name is created.

We hope that the above information will be useful to you and help you solve the problem.

Text/html 05/05/2009 13:52:48 hpaler 0

article taken from "Yromam"

If you don't have it installed Windows hotfix package Q810400" And "Windows hotfix package KB822603"- then install immediately ( http://windowsupdate.microsoft.com/) and I hope you don’t need to read further.

Symptoms.

The device itself WORKS. You checked this on another machine .

When connected specifically to your computer, it is either not detected at all, or is detected incorrectly, or is even detected correctly, but does not work as it should.

Are you sure that all the necessary drivers for all devices connected to the system are installed.

Are you sure that reinstalling and updating USB drivers controllers and USB devices are made correctly.

In "Device manager" - shows that all devices are working normally and there are no conflicts.

The device still does not work, nothing helps and you are ready to reinstall the system.

Reason.

Typically, this situation can arise if the USB 2.0 Enhanced Host Controller uses one interrupt together with some other device (IRQ Sharing), such as audio or video. In this case, the correct transfer of parameters (FDO, PDO) from drivers is disrupted USB (usbhub.sys, usbstor.sys, usbport.sys) to drivers logical devices, for example from usbstor.sys to disk.sys in case "USB 2.0 mass storage device".

Possible solutions.

REQUIRED DISCLAIMER:

ALL further actions You do so at your own risk, and neither I, nor our company, nor any third party does not bear any responsibility for the consequences of your actions. If you do not understand at all the meaning of the actions described below, it is better not to give it to you. In any case, save everything you can, make a backup, create a restore point, etc.

The following is written based on the answer " Microsoft Windows Support Professional" to Mr. rosest, which he published in the conference site http://www.experts-exchange.com/Hardware/Q_20790258.html with permission from MS support. Although it mentions a digital camera, this applies to all USB mass storage devices (cameras , card readers, USB HDD, etc.).

Step 1: Disconnect all USB devices from the computer and boot the computer in SAFE MODE ( Safe Mode) - press F8 when the computer starts.

If you use a USB mouse and/or keyboard, you don’t have to disconnect them, but if you remove either the USB controller, or the hub, or them themselves, they will not work. So, it is better to boot with a non-USB keyboard and mouse.

Step 2: Removing hidden devices

1. Click START. Click Run. Type cmd and click OK.

2. Type "set DEVMGR_SHOW_DETAILS=1" (without quotes) and press Enter.

3. Type "set DEVMGR_SHOW_NONPRESENT_DEVICES=1" ( without quotes) and press Enter.

4. Type "start devmgmt.msc" (without quotes) and press Enter r.

"should appear" Device Manager", or "Device Management" in the Russian version.

5. Click View. Click Show hidden devices.

6. Click "+" to expand Imaging devices, Unknown devices, USB devices, Disk Drives, Storage Volumes, DVD/CD-ROM and other classes that may be related to your non-working device.

For example, USB 2.0 HDD includes classes Disk Drives, Storage Volumes, USB devices

7. If you see your device (including the gray ones) in the expanded classes, right-click on it and click Uninstall in the drop-down menu.

For example, for a USB 2.0 HDD you need to remove everything "USB 2.0 Storage Device USB Device" from class " Disk Drives", all " USB mass storage device" from the "USB controllers" class and gray "Generic Volume" from the "Storage Volumes" class.

Be careful not to remove devices serving your hard drives from which Windows boots.

Step 3: Delete all oem*.inf files

1. Click START. Click Run. Type cmd and click OK.

A command prompt window should appear.

2. B command line, print the following ( without quotes ) and press Enter after each command:

"cd\windows\inf"
"ren infcache.1 *.old"
"ren oem*.inf *.old"
"del C:\windows\setupapi.log"
"exit"

You can do the same using any shell, you just need to enable the ability to view hidden and system files(the inf directory is hidden).

NB! If you have multiple copies of Windows installed, you must do this procedure FOR ALL Windows installations.

Step 4: Delete all keys in the registry key HKEY_LOCAL_MACHINE/Enum/USB that begin with VID

Deleting VID_.... keys from the registry will cause USB devices to be recognized again when the system is restarted.

WARNING: If you have a USB mouse or keyboard, do not delete their registry branches, otherwise Windows may glitch upon restart.

You can identify these branches by clicking to "+" VID_.... key and click on the key on the step below. If on the right in the value of the DeviceDesc variable you see something like “Human Interface Device” or HID, then this is just a mouse or keyboard.

1. Click START. Click Run. Type regedit and click OK.

The Registry Editor should open.

2. Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USB.

3. Select and delete all (except HID) VID_.... keys.
It doesn't work?! Right! First the access rights to the corresponding key must be set VID_.... registry To do this:

right-click on the corresponding key, open the menu and select Permissions.

choose Everyone (Everyone) and assign Full Control (full access).

Click Apply, then OK.

4. Close everything and turn off the computer.

Step 5: Connecting your device to your computer:

While the computer is OFF, connect your device to the USB port.

Turn on the computer.

AFTER Windows has FULLY loaded and stops furiously rustling the hard drive, connect power to your device.

The process of detecting a new device and completely reinstalling the drivers for it should begin.

PS: If after step 2 step 3 is not executed, I warned you.

Notes

The procedure described above can also be applied to root_hub branches, but only if you do not have a USB keyboard and mouse.

The USBSTORE branch can also be deleted in step 4.

Finally, you can try completely removing the USB subsystem and forcing Windows to recognize and install all USB drivers again. In this case, you need to remove all USB devices in step 2 in the order in which they are located when viewed in Device Manager when viewing devices by connection. For example for USB Flash:

first Generic Volume,

then whatever-it-is-called-USB device,

then USB mass storage device,

then USB Root Hub,

In the registry, too, accordingly, completely delete the keys HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USB and HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USBSTORE .

Text/html 05/05/2009 13:58:42 hpaler 0

This article is taken from "YROMAN"
USB device problems, diagnostics and solutions.
The thread is dedicated to problems with flash drives initially - identification, data recovery, restoration of performance. But the advice given here ultimately concerns USB devices and storage media in general.
In the title I will try to track interesting solutions and summarize the information.
We ask those asking questions to first read, think and try the solutions given BEFORE asking a question.
So.... there is a lot of detail in the posts below, but I’ll try to summarize, and the overall result applies to almost all USB devices (we’ll skip the exotic stuff about incorrectly connected USB panels to the ports on the mother right away):
1. Data recovery
With a reference flash drive, this is not a problem with modern operating systems. They are recognized by software and processed as hard ones, so we’ll forget about it, okay???
2. Software that can unlock flash drives, format them, etc.
and so on is somewhat individual, highly dependent on the controller in the flash drive, and we will encounter the search problem a little later.
3. Much can be solved
through DOS commands... and drivers. Advice from Linux experts is welcome. It’s easy to find DOS drivers...type USB-DOS in any search engine...and you’ll find it
4. Quite often
Flash drives locked under XP are formatted normally under 98, and then live normally in other systems. To work smoothly with most different types of devices in 98, you can use the link:
http://lemnews.com/drivers/
there are working natives...
5. Non-essential addition
at the moment - it is confirmed that the fights on 98, for example, are made using the same technology... is there a native one? How can I make the device appear without the native voice or if it is not identified? It’s simple - using USBView, read the vID-pID of the device...and in the info file of the drives from another normally working device, correct the required one to the required one. And this applies not only to flash drives, but to everything growing under USB.
6. The flash drive is visible on one computer, but does not work on another.
A problem that pops up quite often. To partially solve the problem, I recommend going to:
http://www.krn.ru/support/FAQ/Last_C...B_in_WinXP.htm
I think it will work under 2k with minor changes...
7. Is the device working?
You connect the device... and it goes into confusion... either it doesn’t show up, or it asks for a fight..... WHAT to do? It's simple - we try to use USBView and read the information here:
http://www.krn.ru/support/UDsearch.htm
Perhaps the device is simply not understood normally by the system. The solution options are to find the right fight, look higher in the top, find the right software..... everything is in the link...
For work, I can give you a link to the ID file:
http://www.linux-usb.org/usb.ids
And one more thing... when working with USBView, I recommend checking the Config Deskriptors checkbox in Options so that the program provides more information on the connection... it will help! And don’t be lazy to press refresh with your hands... and look for a fresher version of the program, if there is one!
Advice from Linux specialists and their data are welcome!
If the device is not detected by this method at random... that's it, read below.... and then based on the results - either a wooden jacket and a funeral in the trash, or go to the craftsmen to resolder the controller and, along the way, planar inductances , transformation chains and so on... it all depends on the decency of the specialist and your facade of the muzzle...
For example, my BUS makes current at cost.... well, sometimes we shoot about it, however good decision this or that problem... but this does not apply to the top!!!
8. You don’t have to read... ..
But problems were noticed under XP and 2K with intermediate card reader hubs. The flash drive device suddenly breaks off... only reconnection restores the connection. I see a problem in one thing - the interpretation of data flow codes between the hub on the mother and the intermediate host...
And also due to lack of nutrition... such hosts often feed from the mother herself... which is no good! As an example, screws that live through unstable power adapters can suddenly, out of fright due to a power surge, either be cut off or become locked....tested in practice. This may also apply to USB devices. Think for yourself, decide for yourself....
Clarifications to the end of paragraph 8
Just in case, I’ll allow myself one more lyrical digression.
Well, this is so, for greater clarity, although it is greatly exaggerated, I think it is accessible.
We must remember that in addition to the main power circuits of the motherboard, there is also a very necessary reference +5VSB.
According to the basics of power supply and mother-building standards, it provides standby currents in the mother’s standby mode, a signal of readiness to start, the launch itself and feeding of the peripherals that can start the computer, such as:
-mice-keyboards
-networking devices-modems-like hardware that has WOL\WOR functions to wake up the mother
-memory in STR mode
-quartz on mother (clocks, timers, etc.)
-saving data in CMOS
-USB peripherals in standby mode - shutdown of the computer
- Well, and about the little things.....
So, if we follow the canons, then in the form of this power supply branch we have a low-current constant reference.
And according to the same canons, after startup, at a certain moment, the automation MUST switch the power of peripherals and others to the main +5 volts. In this case, measurements will show that after some dip further the +5VSB branch will be exactly 5 volts with minimal fluctuations.
We also remember that when the current threshold for this interface reaches 750 milliamps, the automation MUST also briefly turn off the interface and not turn it back on until the consumption currents drop...otherwise it’s a mess.
But... alas, now mothers blurt out all sorts of things, so there is no need to look for a standard.
Now you can think for a minute what happens if the automation does not switch the power to the main source upon startup. The currents may be enough for the main work, but connecting each new consumer to this power circuit will drain it... and depending on the solution of the circuits, either the next consumer will not receive sufficient power, and as a result, it is simply not recognized... or a jump and how BSOD option or even turning off the mother.
It’s very easy to observe power references if you have a head and an oscilloscope (well, a normal probe is also good), or programs like Sensor. And the dancing of this reference may indicate that either the sensor on the mother is dying, and this is very unpleasant, or we have a problem with the power supply.
A partial solution to the problem lies in the reading of phages to mothers. Quite often there was this option - some ports with jumpers on the motherboard can receive power not only from the duty bus (+5VSB), but also from the main power circuit, which receives current after the computer is started. This is done by installing jumpers (look for it in the descriptor). Sometimes, but very rarely, such switches are present in the BIOS-CMOS settings.
Http://www.rdm.kiev.ua/flashutil.php utilities for usb

The error message “USB device not recognized” appears when connecting via the interface USB flash drives, printer, keyboard or any other equipment may be due to a number of factors. Therefore, it is impossible to suggest any one way to resolve the problem: you may have to try all the methods presented below.

Equipment diagnostics

First of all, you need to make sure that the connected USB device is working properly. Try connecting the equipment to another computer (if possible).

If the error appears on all machines, then you need to look for the cause of the problem in the device itself, the computer has nothing to do with it.

The ports may also be broken. If the equipment is detected on another computer or when connected to another USB connector, then you should. If there is no second computer, you can try the following troubleshooting method:
1. Remove the USB device from the port.
2. Disconnect power from the computer by turning it off and unplugging the plug from the socket. Press the power key on the system unit and hold it for 10 seconds to relieve residual voltage.
3. Turn on your computer and try connecting the equipment again.
Do not forget also about the basic rules for working with devices connected via the USB interface.

Devices should be connected to the ports located on the rear panel system unit, directly to the motherboard (this does not apply to laptops, they have all the ports on the motherboard).

Also, if you are using a splitter that has many devices connected to it, then unplug the unnecessary devices.

Checking drivers

If the hardware is working properly, then the cause of the problem is probably a software error, which can be fixed through the device manager. To open the manager, press the Win+R key combination on your keyboard and enter “devmgmt.msc”.

Unidentified equipment should be looked for in the “USB Controllers” and “Other Devices” sections. If the connected device is marked as " Unknown device", right-click on it and select "Update Drivers". It is important that you have an Internet connection: the system will independently search for suitable drivers.

If the connected device is located in the “Controllers” section, and next to it you see exclamation mark, that is, there are two ways to fix the problem. The first is updating the configuration:

The second method is to prohibit the device from turning off to save energy:

If the drivers are not installed automatically, you can reinstall them manually:

The list will display compatible driver, which is already installed. Select it and continue adding. After such a peculiar reinstallation, the problem with identifying the equipment will be solved. If it doesn’t help, download the device driver from the manufacturer’s website (applies to printers and some keyboards) and add them to the system manually. The procedure is the same, only you do not need to select from the installed ones, but specify the path to the downloaded driver.

Changing power settings

On laptops running Windows control 8.1 and Windows 10, the “USB device not recognized” error occurs quite often when connecting external drives and flash drives using USB 3.0. This problem is solved by changing the power supply parameters:

After a reboot, the problem with detecting USB devices on a laptop usually disappears. If we are talking about a flash drive, then sometimes using special software for recovering removable media helps: