USB device mouse is not recognized. The flash drive itself does not work. Rare reasons why a usb device is not recognized

Probably everyone has at least once encountered a problem when, when connecting a USB device, an error pops up: USB device not recognized. A similar error occurs when using both USB 2.0 and USB 3.0 devices.

Let's try to figure out the reasons.
There can be many reasons for such an error. And there are many solutions too. Therefore, we do not guarantee that you will be able to solve this problem using our recommendations.
Perhaps this article will help you solve the problem.

Resolving the “USB device not recognized” error.

Also sometimes (rarely, but it happens) such a problem can occur if you connect a USB 2.0 device to the USB 3.0 port.

Method 1. This error often occurs when using a USB extension cable. In this case, try connecting a USB device without an extension cable. Or replace the extension cord. The second common reason is a malfunction of the device itself or the USB port. Try testing USB devices on known working USB ports.

Method 2. This method can help if everything worked fine before and such failures have never happened with this device. Disconnect the problematic USB device. Turn off the power to the computer, unplug the cord from the outlet and hold down the PC power button for a few seconds. If you have a laptop, unplug it and remove the battery. This action will remove residual charges from the computer motherboard.
Then turn on the computer and connect the problematic device. There is a chance that the device will work.

Method 3. If you have too many USB devices connected to your computer, and moreover, some through a splitter, try disconnecting some of the equipment, restarting the computer and turning on the required USB device. Also note that if the USB device has an external power source (for example, some removable hard drives), connect it.

Software solution to the problem

Now let's try to solve the problem using software.
Run "Device Manager". (For Windows 7 - “Computer” - “Management” - “Device Manager”)

The unidentified device will most likely be located in the following sections device manager:

USB controllers
-Other devices (and be called “Unknown device”)

Method 1. If the unknown device is in partition D other devices, you can right-click on it and select "Update drivers" and perhaps the operating system itself will install everything that is needed. Or select menu "properties" unknown device and open the tab "Intelligence". Select an item from the list Equipment ID. Try to find on the Internet by ID (simply typing the ID into a search engine) what exactly this equipment is and what driver it may require.

Method 2. Right click on the device, select "Properties", then on the tab "Driver" Click the "Roll Back" button if available, and if not, click the "Uninstall" button to remove the driver. After that, in Device Manager, click “Action” - “Update hardware configuration” and see what happened to the unknown USB device.

Method 3. Try going to the properties of all devices with names Generic USB Hub, USB Root Hub or USB Root Controller and tab "Power Management" uncheck “Allow this device to turn off to save power.”

Another option is that a USB 3.0 flash drive or external hard drive is not recognized in Windows 8.1.

This problem is solved like this:
Go to Windows control panel - power supply, select the power plan you are using and press "Change advanced power settings". Then, in the USB settings, disable temporary disabling of USB ports.

We hope you were able to resolve this issue. If not, most likely the problem is with the device itself.

Users regularly connect modern Android smartphones to a laptop or PC to dump music, photos or other necessary files. In some situations, the computer does not detect the phone via USB, which makes working with it very difficult. There is a certain list of reasons that prevent the device from being recognized.

The computer does not recognize the phone via USB - reasons

All possible problems that users encounter can be divided into software or hardware. In the first option, the problem is in the settings, drivers or computer system, in the second - in the cable, USB port of the smartphone or laptop. Almost all problems can be fixed, but before you try to fix connecting your phone to your computer via USB, try restarting your PC and device. This simple procedure often helps, especially with device models from Lenovo, Samsung, HTC, FLY, LG, Nokia.

The phone does not connect via USB to the computer, but is charging

A very common problem with devices is when the phone is not displayed on the computer via USB, but the battery charge indicator is on. The smartphone responds to the connection, but the system does not want to display it. To identify the cause of the failure, you can do the following:

Move the power cord to a different port on the laptop. Now most models are already equipped with version 3.0 connectors (blue), but you need to use 2.0. For stationary versions, the connection should be made from the back of the case, and not from the front panel.
Try using a different cord if the sockets are the same. This will help identify problems with the cable. If one of the twisted pair wires breaks, the smartphone may continue to charge, but not be detected.
Inspect the device socket to see if there is any debris or dirt inside that disrupts the connection of the contacts and makes it difficult to find the device.
Try connecting the device to another PC. If it is detected there, then the problem is definitely in your system: there are no drivers, a virus, or the power supply on the laptop is incorrectly configured. This problem will be described in more detail below.

The computer stopped seeing the phone via USB

It often happens that the device was previously detected, but for some reason it suddenly stopped. A common reason why the computer does not see the phone via USB is that the port drivers have crashed. Due to software glitches, the latter stop functioning correctly and are unable to find any connected devices. In this case, there is no need to reboot the device. You need to do the following:

Find the “native” drive for the motherboard. The set must contain all system files for the correct operation of the USB ports.
If the disk is lost, find the developer’s website on the Internet. Manufacturers, as a rule, make all the necessary software freely available.
Reinstall the drivers.

After the PC has finished installing the files, you need to restart the computer. Only at this moment is it time to check whether the system can recognize the device. If these steps do not help, make additional settings:

In the Control Panel, go to the "Power" section.
Select "Set up power plan" (for laptops).
Click "Change advanced settings..."
From the list, select “USB Settings” and click the plus sign.
Then expand the “Temporarily disable USB port option” section.
Set to “Disabled” for battery or mains operation.
Click “Apply” and “Ok”.

In addition to problems with port drivers, files for the Android device itself may be lost. To check this, you should open the device manager and see if there is an exclamation mark in the “Portable devices” section. Check the list for your phone. If it is not there or there is a warning sign, you should do the following:

open the device and click “Uninstall driver”;
turn off your mobile device;
connect it again;
wait until the system installs the connected device again.

The computer does not find the phone via USB

Sometimes the situation is such that the laptop initially does not find the device. If the reason is not a broken cord or port, then you should carefully check why the computer does not see the phone via USB. The causes of problems may include the following:

Android system settings. Modern mobile devices have several connection options: charging only, storage, modem. By default, most of them are set to the first value from the list. As a result, the device is charging, but is not displayed by the system. As a rule, the top menu of the device when connected suggests changing the connection type; you just need to select the required option. If this does not happen automatically, you need to follow the following path: Settings -> Memory -> Properties. Here you must set the required connection type.
Sometimes a smartphone is used as a modem, which prevents it from being recognized as a storage device. Disable this option through Settings.
Turn on Windows Update, which will allow the PC to download fresh, up-to-date drivers for all connected devices. When connecting, do not forget to unlock your mobile device.
When sold together with the smartphone, a disk is provided that contains a program for connecting the phone to a computer via USB. Use it to discover your device.

The computer does not recognize the phone via USB - viruses

Malicious programs that have entered a PC system can behave in completely different ways. Sometimes they become the reason why the computer still does not see the phone via USB. Virus scripts disrupt the operation of various devices, remove drivers, and block data transfer. The risk of infecting a smartphone is extremely low, because viruses for Android are written extremely rarely. However, to protect yourself from infection, you should check Windows using specialized programs:

Dr.Web;
Antivirus Kaspersky;
Malwarebyte.

What to do if your phone does not connect to your computer via USB

If your system, after all the steps described above, still does not see the device, but you are 100% sure that the problem is not in the USB cord or socket, the device was previously detected, there is only one way out - Hard Reset. A hard reboot will lose all data from the phone's internal memory and reset it to factory settings. This will eliminate the possibility of a software failure on the part of the mobile phone.

All data that you save on the SD card or cloud services will remain unharmed. This option should be used as a last resort - provided that all other methods did not give the desired result, and you are sure that the problem is in the settings of the device, but not the PC. For each model, be it Samsung or NTS, the manufacturer has programmed hardware buttons that make it possible to perform a hard reboot. You can enable it from the settings, if the device turns on and you have access to them.

Video: how to connect your phone to a computer via a USB cable

When you connect a mobile phone, flash drive, external hard drive, printer, scanner or any other device to your computer or laptop via the universal serial bus, you may encounter a very common error - USB device not recognized with the comment “One of the devices connected to this computer is not working correctly or cannot be detected.” It is found both in Windows 7 and on the most modern version of the Microsoft operating system - Windows 10. It looks like this:

In English versions this is the “USB Device Not Recognized” error:

Why this error appears and what ways there are to fix and eliminate it - we’ll talk today.

Reason 1. Cables, extension cords and hubs

Poor quality of cheap USB cables, adapters and splitters (aka “hubs”) are the most common source of various problems for devices connected via a universal bus. Therefore, when the error “USB device not recognized” appears, the first thing you should try is to exclude the intermediate link in the video of the extender or hub. That is, we connect a flash drive, 3G/4G modem and similar things directly to the USB port on the computer’s motherboard. The front connectors on the system unit case are also not suitable because they are also often the cause of malfunctions, which means you shouldn’t “trust” them.

In the case of a printer or scanner, pay attention to the integrity of the cable. If there is visible damage, use a different cable. It is inexpensive and will not stretch your budget at all.

Reason 2: Faulty USB port

The second very common cause of problems with the operation of external devices is physical damage or even breakdown of the USB port. It’s a paradox, but often people who wash themselves two or three times a day do not at all monitor the cleanliness of the equipment with which they interact every day. System units especially suffer from this. They often like to be “pushed” into the dustiest and dirtiest corner. As a result, dust accumulates in all possible places, including USB ports. I even happened to discover mummies of various beetles and insects there. And dirty contacts also do not contribute to stable operation of the connector. In addition, there were cases when users plugged in a mouse, printer or flash drive so zealously that they simply broke the port.

Therefore, if the error “One of the devices connected to this computer is not working correctly” appears, carefully inspect the connectors for dirty contacts or damage. Try switching to the neighboring one and see if there are any errors on it. In addition, it’s worth opening Device Manager and looking at the USB controllers to see if any of them have a red cross. This usually means that it has failed and the motherboard needs to be repaired. Sometimes, however, installing an additional controller in a PCI slot helps.

Reason 3. Drivers and software failure

Problems when installing the driver for a particular gadget are another possible cause of the Windows error “USB device not recognized.” If you open Device Manager, then in the list that appears you will see a yellow triangular icon in the list of controllers.

In this case, it will be signed as “Unknown USB device (enumeration failure)”. This may happen because the operating system cannot find suitable drivers (for example, when upgrading the OS to Windows 10), or a conflict arises between already installed and new ones. To correct the situation, you must first find the latest version of drivers for the connected device on the Internet, download and try to install.

If you don’t know what to look for specifically, then go to the device properties, open the “Details” tab and select the “Hardware ID” property from the list.

Identification lines will appear in the field below. We find two identifiers in them - VID And PID. We remember or write them down. We go to the Internet (for example, to the site pcidatabase.com) and look for detailed information about the connected removable disk, phone, mouse, printer, scanner, etc. And then you need to search for and install the current version of the driver.

But if you think that the “USB device is not recognized” error is due to a possible conflict between old and new drivers, then to eliminate it you will have to completely remove both. This is done either again through the Device Manager, or using third-party utilities. After you clean the system of faulty software, you will need to install the latest version and check the operation of the device.

Reason 4. Malfunction of the device itself

Yes, unfortunately, such troubles happen. This happens especially often with flash drives and external hard drives. Their controller either completely fails, or the area on which the microprogram for the chip is written is faulty. It cannot boot and therefore the computer does not understand what it is and labels it as “Unknown USB device”.
Check it works on another computer. If the same error appears there, then take it to a service center or to the trash. For example, my wireless mouse malfunctioned this way. On another PC it worked without problems. Most likely there was a conflict between her radio module and something else in the room.
Sometimes a malfunction may occur due to insufficient power. This happens with external HDDs. In this case, they must be connected not through one, but through two ports at once. There is a special cable included for this purpose.

Note: If, when you turn on various equipment or gadgets via USB, your computer or laptop begins to behave strangely: it turns off, reboots or freezes, then immediately unplug it and take it to a service center. As a rule, this indicates a malfunction of the connected device itself, and further independent diagnostics can lead to even more dire consequences.

There are cases when you connect your phone to a personal computer or laptop via a USB cable, the first one does not recognize it. It becomes impossible to reload files from your phone to your computer and vice versa. It's a shame.

However, there are ways to recognize the cause of this type of incident and ways to correct it. If your phone is not just a mobile phone, but a gadget with an operating system, then reloading files via USB is not possible in the usual way, i.e. The phone is no longer like an ordinary flash drive - it is a computer itself. In order to transfer files from your phone, you will have to either reflash it or send files by mail.

I recently encountered a similar problem on a Samsung Galaxy phone: until the gadget was configured in computer mode, reading files and downloading them to a PC via a USB connection was impossible, after “resetting” this became impossible.

However, there are cases when the phone operates in normal mode and acts as a flash drive, but the PC still does not “see” it. Why? What can you do in this case to try to fix the problem. Read below.

Music, movies, photos, applications - all this is simply necessary for a modern person in his phone. Without communication with a PC, the mobile phone will sharply lose its functionality. Close interaction is ensured through a connection via a USB cable or via Bluetooth. Since file transfer via Bluetooth is quite slow, the USB connection is the most common.

But the user, having decided to use data transfer via a USB connection, suddenly cannot do this. Understanding his disappointment, let's give him some advice. To do this, consider two options: when the computer does not respond to the mobile connection at all, and also if the phone is detected as an unknown device. So, now in more detail.

How to detect a problem

When you connect to the computer, your phone is not detected in any way, nothing lights up on it, and there is no message on the monitor about connecting the device. This is a fairly common malfunction, with several causes. Let's try to list them and give recommendations for eliminating this problem. This assumes that the USB port you are connecting to is working. That is, other devices work normally through it.

1. If the phone used to connect normally, but then suddenly it didn’t want to, then you should, first of all, suspect the quality of its connection to the computer. Try removing the connection cable from both the mobile and the USB input and then reconnecting them. It often happens that the contacts of the telephone connector simply become loose or dirty. This problem is inherent to a greater extent to the Sony Ericsson brand, whose models stand out in the mobile communications market with a completely illiterate and often faulty connector.

Tip: if possible, try to clean the telephone connector with an eraser, after which remove any remaining rubber from the surface of the contacts.

If cleaning does not help, then connect the phone via another USB cable. Take it from friends or relatives. Cable failure is not the most common cause of trouble, but this option also needs to be taken into account. If it helps, then you just need to buy a new accessory.

2. Restart your computer. Oddly enough, this method helps in most cases without any additional measures. The reboot process resets the system settings and redefines the USB ports. By the way, when the computer does not see the tablet, the best way to help is to restart the computer, as is the case with the phone.

3. Rebooting your PC didn't help? Then, to be on the safe side, restart your mobile phone. Unplug it, remove the battery for 10 minutes, and then put it back in. Turn on the device. Nothing happens? Go ahead.

4. Disconnect the cable from one USB and connect it to another USB input. This simple action often helps, since the computer sometimes confuses the ports. To ensure that the OS sees the connection, you can use the following method. Go to Device Manager and find a list of used ports there. Typically this information includes all USB bus controllers. Open the list. In it you can see all the working ports of the computer. Find in this list the port to which the phone is currently connected (this can be seen in the “Power” column). All other ports, except the one found, can be temporarily disabled. The computer will have no choice but to see your mobile.

There is, of course, the possibility of a breakdown of the phone itself or its connector. This is the most difficult option, in which you cannot do without contacting a service center. There they will be able to tell you exactly why the computer does not see the phone and how to fix it.

USB device not recognized

We go further, considering the second case, in which the computer identifies the phone as an unidentified device. Of course, the OS does not want to work with an unknown device. And the question is not that Windows itself is imperfect, because the same problems often arise with Linux and other operating systems. Therefore, we must help the computer identify our mobile phone. We list the reasons for this phenomenon and possible user actions:

The problem may be with the phone itself. Connect the device to another computer. If the problem persists, then the reason lies inside the mobile device. You may need to enable one of the computer connection modes in the settings. For example, the “Data transfer” or “Storage” mode. Experiment with these modes;

Tip: Check your phone settings. In some mobile models, you must manually enable synchronization mode, which is disabled by default. Or disable the current blocking. If there is a blocking, open access must be established.

a) restart your PC and phone as described in section 1;

b) often the mobile phone is not recognized by the OS in case of lack of power supply. If you connect the phone to the front computer panel, then try connecting it directly to the motherboard, into the USB slot located on the back of the system unit;

Tip: In the Device Manager section, find the port you are using and open the Power Options tab. Check to see if the “Allow device to turn off to save power” checkbox is unchecked. If the checkbox is checked, remove it.

Sometimes crashes occur in the OS, as a result of which the “native” drivers of some devices are lost. Reinstalling drivers for the motherboard and connected devices helps solve the problem. If your phone came with a driver disk, use it to connect the device;

Tip: You can check whether your device needs drivers in Device Manager. If there is a yellow question mark before the device name, you can conclude that there are no drivers for this plug-in. How can you determine that an unidentified device is a mobile phone? Very simple. Disconnect it from your computer and the question mark will disappear.

We also cannot exclude the possibility of the OS being infected by a virus that sets its own rules on the computer. Check all drives (including the system drive) with a good antivirus with up-to-date databases.

If none of the above helped you, and there is still no connection between your mobile phone and your computer, then you can use a radical treatment. If the phone is detected perfectly on another PC, then the cause of the problem most likely lies in the operating system. You'll have to reinstall the system. Then everything will surely work. Moreover, such errors in the system accumulate gradually, it is impossible not to notice. Thus, reinstalling the software will not only solve the issue of connecting the phone, but will also eliminate other possible errors.

Every computer and flash drive user has at least once found himself in a situation where the flash drive failed. That is, it is impossible to view the information that is stored on it. The flash drive does not work, the computer does not see the flash drive, files are either not written or are not transferred from the flash drive, or it shows a discrepancy in the storage capacity of the storage device.

But first things first.

The computer does not see the flash drive

In fact, there are a lot of problems that affect the computer’s detection of a flash drive - even the version of the operating system itself.

And so, you inserted a flash drive into the computer, it is not detected. How does this manifest itself?

The computer tells you what you need " insert disk" Even when you did.

The computer says that the disk needs to be formatted because it is not formatted;

A data error has occurred;

The computer freezes when a flash drive is inserted;

The device is not recognized.

Now you will read a short instruction on how to solve the problem when the computer does not see the flash drive. But this does not mean that this instruction will help you 100%. If one method does not help, move on to another until the problem goes away.

Go!

The first thing you can do is check whether the utility sees " disk management» your flash drive. To do this, run this very utility:

Click Start → Execute (Win+R)→ enter → diskmgmt.msc→ press Enter. OR

Control panel → Administration → Computer management → Disk management.

In the disk management window, pay attention to what happens when you connect and disconnect a flash drive to the computer - does the disk disappear and appear again, or not?

The best option is when the computer sees the flash drive, and all the partitions on it are in the “ OK" If this is the case, then do the following: right-click on it and select “ make the section active" You may need to assign a letter to the partition.

Well, in principle, this will be enough for the computer to see the flash drive.

Well, what if suddenly this utility displays the message “ Unknown" or " Not initialized", as well as one partition in the state " Not distributed", this will mean that the flash drive is damaged. Therefore, the computer does not see the flash drive. You need to perform data recovery (more on that later).

If you connect your flash drive through an extension cord or USB hub, then try connecting it directly. Also try connecting to all available USB ports. Next, as an option, you can turn off and restart the computer, disconnect other devices from the computer (well, except for the keyboard and mouse, of course), and then restart the computer. In this case, if the flash drive is detected and starts working, then the problem is obviously in the power supply to the USB ports, there is simply not enough power. There is only one piece of advice - replace the power supply with a more powerful one.

Option to remove old drivers

Use this option when the computer does not see the flash drive and writes “ Insert disc", provided that the flash drive is already inserted. This problem and more can be caused by old drivers that are available in Windows. For example, when you connect a flash drive to your computer, your PC turns off or reboots.

The reason is that Windows installs drivers for flash drives the first time you connect them to the port, and when you unplug the flash drive, the drivers remain in the system and do not go anywhere. Then you connect a new flash drive, a conflict arises, which is caused by the reaction of Windows when trying to use the old driver that was installed when connecting the first flash drive.

How to remove old drivers?

First, turn off the computer. Disconnect all memory devices and peripherals and accessories from it.

Turn on your computer.

Download the utility DriveCleanup.

We copy, depending on your version of Windows, a 32-bit or 64-bit version drivecleanup.exe to daddy C:\Windows\System32.

Launch the command line as administrator (right mouse button on the menu “ Start") and enter drivecleanup.exe . Click Enter and watch how the computer deletes all drivers and entries.

After the removal is complete, simply restart your computer, insert a new USB flash drive and Windows will install new drivers on it.

USB device not recognized

When you connect a flash drive, printer or any other device that connects via USB in Windows 7 and Windows 8.1, and you see an error, an unidentified device - read these instructions and we will try to figure it out.

There are actually many reasons why Windows cannot recognize a USB device, and therefore there are also quite a few solutions.

The device is not recognized. What to do?

If you encounter a problem when you insert a USB flash drive and a message appears that you have connected an unidentified device when connecting any device via USB, make sure that the USB itself is in good condition. This will save you and me time. To make sure the USB plug is working properly, you can try connecting it to another computer or laptop. If everything also does not work, then the problem is in the device itself. If it works, read on.

This method is for those cases where the device previously worked without comment. Everything was determined.

We disconnect our USB device, which the computer cannot recognize, disconnect all devices that we do not need at the moment, and connect a device that is not detected to the rear panel of the system unit and see if the problem is solved.

Correction of the message " Device not recognized" through Device Manager and USB Drivers.

Let's go to device Manager(press Win + R keys) enter devmgmt.msc what field do we click on? Enter.

The connected device will most likely be in the list USB controllers or Other devices(and be called " Unknown device»).

If it is in the list with other devices and you are connected to the Internet, you can right-click on it and press the button update drivers.

If an unidentified device is still in the list USB controllers, then right-click on it, and on the Driver tab, click the button roll back or Delete.

Another option is in the USB properties in the “ Power management"Uncheck the box" Allow this device to turn off to save power».

You can also try for all devices that are in the " USB controllers» do the following:

Click " Update driver».

Click search for drivers on this computer.

Select a driver from the list of already installed drivers.

In the list you will see that there is a driver that is compatible with the device. Select it and click " Further" The driver will be installed, after which the computer may recognize the device.

In Windows 8.1, this problem occurs with external hard drives and flash drives that operate from a USB 3.0 port.

This problem can be solved in the menu for managing the parameters of the laptop power supply circuits.

To do this, go to the Windows Control Panel in the Power Options section, select the power plan you are using and click “Change advanced power settings.” In the USB settings, you need to disable temporarily disabling USB ports.