Solution to unrecognized USB flash drive

Right-click my computer and select "manage" from the shortcut menu to open the "Computer Management" window. In the computer management window, select disk management under "Storage". If you can see a USB flash drive without a drive letter, right-click the USB flash drive, select the "Change drive name and path" option to enable "change ...... The drive letter and path dialog box. Click "change" to open the "Change drive letter and path" dialog box. In the drop-down list on the right of "specify the following drive letter, select the drive letter you want to assign to the USB flash drive, and select the drive letter as far as possible, such as X, Y, and Z. After selecting the drive letter, click OK to return to the last "change ...... In the "drive letter and path" dialog box, click OK again to return to the "Computer Management" window. At this point, if everything is normal, a long-lasting drive letter is set for the USB flash drive, but it is not affected by the Virtual Drive. We recommend that you add N (R2 W: A-p' t5 l. J Insert the USB flash drive to your computer and check whether the icon is displayed in the taskbar. If yes, right-click my computer and choose Properties> advanced> hardware> Device Manager to check whether there are any devices with question marks, right-click the question mark on the device-update the driver and next-No temporarily not connected to the network-next step to automatically install the software (recommended ). In addition, the system does not recognize the USB flash disk. 1. Disable the motherboard usb device. The Administrator disables the USB device in the CMOS settings and sets the BIOS password, so that the computer will not recognize the USB flash drive after it is inserted into the computer. This method has its limitations, that is, it not only disables the usb flash drive, but also disables other usb devices, such as usb mouse and usb Optical Drive. Therefore, this method is generally not used by administrators, unless the computer is very important, it is worth it to discard the entire usb bus function. However, such blocking can also be cracked, even if a password is set. The entire BIOS settings are stored in the CMOS chip, and the memory of COMS is powered by a capacitor on the motherboard. Capacitor power comes from the motherboard battery, so as long as you unload the motherboard battery, with a wire to the original battery place is short and the negative pole, instantly can clear the entire CMOS settings, includes the BIOS password. Then, you only need to unmount the battery and reset the CMOS to use the usb device. (Of course, this requires the chassis to be opened. Generally, it is not suitable for many users ~~) 1 A6 d9 E 'J "x # Q 2. Modify the registry key to disable USB mobile storage devices. Open the Registry file, expand "HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ usbehci", double-click the "Start" key on the right, and change "value data" in the editing window to "4 ", select "hexadecimal" as the base number. After modification, log out and you will be able to see the effect. To prevent others from using the same method, we can delete or rename the Registry Editor Program. 8 bytes ~ 1 G4 \ # B) J N6 i7 M % G Tip: the "Start" key is the work switch of the USB device. The default value "3" indicates manual, "2" indicates automatic, and "4" indicates disabled. ) D (N7 O9 L (l) p c $ t 3. Disable the permission to use removable storage in Computer Management. Computer Management is a Windows Management component that can be opened on the control panel-management tools-Computer Management. In the tool window, general items in storage -- removable storage -- property can control whether the system tray displays security, and manage the permission to use mobile storage devices. In security, the general user's permission is reduced to disable the USB flash drive. The method of cracking is also very simple. The administrator can reduce the permission of ordinary users to use mobile storage devices, but the permission of computer management may not be disabled. Common users can use this tool to remove the permission restrictions for using USB mobile storage devices. In addition, it is worth mentioning that if a USB flash drive can be driven after it is inserted into a computer, but there is no drive letter in my computer, it is likely that the Administrator has changed the default drive letter of the USB flash drive, this makes my computer unrecognizable. In this case, you can see the USB flash drive in movable storage. You can re-allocate a drive letter to the USB flash drive in the USB flash drive attribute settings, and re-plug the USB flash drive. Then, you can see the drive letter of the USB flash drive on my computer. %