Usually the first time you connect the device to USB port, Windows automatically installs a driver for this device. Drivers allow the computer to interact with devices: without them, a USB device connected to a computer, such as a mouse or webcam, cannot work.
Before installing the device
Check the device documentation to see if you need to install the driver before connecting the device. Although typically Windows automatically installs drivers after connecting new devices, some devices require manual installation of drivers. In such cases, device manufacturers provide a software disc and instructions for installing the driver before connecting the device.
If a USB device shipped with the manufacturer’s software, check if it is compatible with the current version of Windows. If it is incompatible or it is not known which version of Windows it is designed for, try connecting the device first to see if Windows can find a compatible driver.
Follow the instructions in the device’s documentation, even if they contradict the information in this section.
“USB device not recognized” - what to do in Windows 7, 8
Any computer can suddenly throw such an unpleasant surprise with any device: USB-drives, smartphones, tablets, computer mice, keyboards, accessories, printers, scanners ... With everything that can be somehow connected via USB, such a problem may occur, but for almost any device, this error is solved in the same way.
The first thing to do when Windows does not recognize the device is to verify that it is working. Connect the gadget to another PC or laptop. If the error remains on the other device, then the whole problem is in the device itself (or the cable through which you connect it) and, most likely, nothing will help you except going to the store for a new analogue.
Also, try connecting the device to another USB-connector, disconnecting unnecessary equipment for a while. If all else fails, continue to the next paragraph.
Go to the device manager. Press Win + R and enter the devmgmt.msc command. In the window that opens, try to find your device (it will be located either in the "USB Controllers" or in the "Unknown Devices"). If it so happens that it falls into the “Unknown devices” tab, right-click on it and update the drivers. In the event that the gadget is in the "Controllers", then right-click on it again, go to "Properties" - "Driver" - "Update". If the update button is not available, then go back to the dispatcher and click "Delete." After that, open the “Action” tab and select “Update Hardware Configuration”, after having selected your USB device.
The above algorithm of actions usually works both when a conventional flash drive is not recognized, and when “USB device is not recognized” when the phone is connected to a computer.
The computer does not see the USB flash drive
Firstly, your personal computer most often does not detect a USB flash drive due to the fact that it is faulty. To verify this, insert the USB flash drive into another device. If it does not work and not it, then feel free to buy another flash card.
Secondly, check the connector for dirt. Naturally, if banal dirt got into the connector of the flash drive, it will not work correctly.
Thirdly, try inserting a USB flash drive into another slot on the computer (usually there are several).
Next, try formatting your flash drive for the computer's file system. You can see which file system on the PC by going to the properties of the local disk. Now you just need to specify when formatting which file system you need.
Phone is not detected via USB (Android)
A smartphone is usually connected to a PC in order to transfer data and files to it, which are difficult to transfer in another way. You connect the smartphone via a special cable, but nothing happens, and Windows does not react to the new connected device and just charges its battery.
But why does the computer not see the phone via USB on the android, only charging and nothing else? How to solve this?
1. If you bought a new smartphone and try to connect it to an old version of the operating system (Windows XP, for example), which is currently not supported, you must either upgrade to a newer OS, or download Media Transfer Protocol from the official Microsoft website, install it and restart the PC - everything should work.
2. If you have several USB ports on your computer, try connecting your smartphone through a different port.
3. Try changing the USB cable. Faults in the cable are one of the possible obstacles to the USB connection.
4. Check the connector of the smartphone itself. Remember if you dropped it into the water?
5. Connect the smartphone to any other device (PC, laptop). If the phone also stubbornly does not want to work correctly, then the problem is either in it or in the USB cable. If everything worked, then the whole problem is in the computer options - go to the next step.
6. Try plugging another device into the computer (a USB flash drive, for example). If an error also occurs with other flash drives, then go to the “Control Panel” and select “Troubleshooting”. In it, click on "Device Settings". Auto tuning will occur.
7. If the computer still does not see the smartphone, then only the driver update remains.
Note: the newest phones are now configured by default not to transfer data, but to charge. To check what type of USB connection is used, use the simple instructions from the screenshots below.
Problem connecting a USB card to a tablet computer
Some tablets now have the ability to connect a USB drive. Through a special adapter, you insert a regular USB flash drive, the tablet does not react in any way. So why doesn’t the tablet see the USB flash drive through the adapter?
The main reason for this error is different standard file systems. Then you need to format the flash drive in FAT32 (it is for such a system that modern tablets are sharpened) through a computer.
If this does not help, then you need to get root access to the device and download StickMount application from Google Play, through which you can install the USB drive virtually after inserting it into the tablet.
If none of the above methods helped, then think about repairing the tablet.
Connect and turn on the device
Most USB devices are equipped with switches; turn them on before connecting. If the device has a power cord, connect the device to a power source. Turn it on before connecting.
Select the USB port to which you want to connect the device. If the USB ports are located on the front panel of the computer case, then use one of them if you plan to often connect and disconnect the device. (The next time you connect the device, you can use any port).
Plug the device into a USB port
If Windows automatically finds and installs the device driver, a message appears stating that the device is ready for use. Otherwise, you will be prompted to insert a driver disk.
After installation, refer to the device documentation to learn about the need to install additional software.
Sometimes USB devices are not recognized by Windows and do not have a driver disk. In this case, you can try to find the device driver on the Internet yourself. Start your search from the manufacturer’s website. Typically, on such sites, drivers can be downloaded from the support page.
Notes: Before connecting the device to the USB port of a USB hub, monitor, or other device connected to the computer, make sure that the USB port provides proper power to the device. Small devices, such as USB flash drives and mice, as well as devices with their own power cords, such as printers, usually work properly even when connected to a USB hub that does not supply power. Some devices need more power, such as scanners and USB webcams — a hub with its own power cord is required to function properly. If the device connected to the hub does not work correctly, try connecting it to one of the computer's USB ports.
Devices that transmit a large amount of information, such as external hard drives, scanners and video cameras, work more efficiently when connected to high-speed USB 2.0 and USB 3.0 ports.
Some older computer models only have USB 1.x ports or USB 1.x and 2.0 ports. If the device requires a high-speed port for proper operation, check the accompanying documentation for your computer to find out if it supports USB 2.0. If your computer only has a USB 1.x port, you can add USB 2.0 by installing a USB 2.0 card.
Disconnecting a USB device
Most USB devices can be removed or disconnected. Before disconnecting and removing storage devices, such as a USB flash memory, make sure that the storage of information on the device is completed. If the indicator on the device is still on, indicating the use of the device, wait a few seconds until it goes off, and turn off the device.
If the Safely Remove Hardware icon is displayed in the notification area in the right corner of the taskbar, you can use it to make sure that the device has completed all operations and is ready to disconnect. Click to see the list of devices. Select the device you want to remove. A notification about safe removal of the device will appear on the screen.