1. There are files in the USB device that are used by other programs, and the corresponding programs need to be closed before they can be deactivated. You can simply log out once and the problem will be solved. 2. If you copy something and then stop it, there may be links in the USB flash drive in the memory. You can choose to copy other files and then stop the USB flash drive. It will usually stop. 3. Confirm that the data copy between the USB device and the host has stopped, and data is still being transferred. Of course it cannot be stopped. 4. Sometimes the explorer.exe process often causes USB devices to fail to be deleted and certain files and folders to fail to be deleted. The solution is to open the process list in the task manager, close explorer.exe, and then add a new task. explorer.exe (the interface has been restored), and finally try to delete the USB device. This method is the most commonly used. 5. Sometimes, some programs are accessing files on the USB flash drive or mobile hard disk. For example, a xxx player is playing a movie in the mobile hard disk. The player has not been turned off, so of course the mobile hard disk cannot be deleted. Sometimes, even though the player is turned off, the player process still remains in the task manager. You can delete it by stopping the process. This is not only true for players, but also for other programs. For example, when you use QQ to transfer files and directly select a USB flash drive to save the address, if you don't close the QQ dialog box after the transfer, you cannot safely delete the USB flash drive immediately. If closing the dialog box still doesn't solve the problem, just close QQ. 6. Shut down the rundll32.exe process. 7. If you have no choice, restart it. Method 2

Change the "Turn on all monitoring" of the anti-virus software to "Turn off all monitoring" and then exit. USB device, you can successfully. Take out the USB flash drive and then turn on all monitoring. The third method

You can try to enable the "Optimized for quick deletion" function. The specific steps are as follows:

(1) Insert the flash drive into the USB interface, and then click on the system desktop Right-click on the My Computer icon.

(2) Expand "Properties→Hardware→Device Manager→Disk Drive" and find "USB Flash Drive USB Device" (the names of flash drives of different brands may be different).

(3) Double-click to open the "USB Flash Drive USB Device Properties" dialog box, and then switch to the "Policy" tab.

(4) Select the "Optimize for quick deletion" item, click the "OK" button to save and exit.

After doing this, you can directly unplug the flash drive from the USB interface when there is no data reading or writing operation on the flash drive (that is, the indicator light of the flash drive does not flash).