Several reasons and solutions that cause the computer to prompt that access cannot be accessed and access is denied after inserting a U disk are as follows:
1. There is a problem with the permission setting of the U disk, resulting in denial access. You can right-click the drive letter of the USB flash drive, then click Properties--Security--Permission Edit---Set the read and write permissions from Deny to Allow.
2. There is a problem with the computer USB interface, resulting in access being denied. You can try using other USB interfaces to connect the USB flash drive. If necessary, you can use a USB extension cable to connect the USB flash drive.
#3. The U disk file system is damaged and access is denied. You can right-click the USB flash drive, click Properties and select Check Disk to let the computer system automatically repair the system errors of the USB flash drive.
4. The U disk is damaged and access is denied. You can only use another U disk.
5. Computer or USB flash drive is poisoned and access is denied. You can install anti-virus software for anti-virus and then return to normal after removing the virus.
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