May I ask a silly question - have you seen the physical switch on a USB flash drive? I tried a number of things and finally realized that the physical switch was not unlocked, causing the disk is write-protected on all my computers.
Sometimes, when the USB drive’s physical switch is locked, the device becomes write-protected on all PCs and devices you connect. You should locate and turn the physical switch from ON to OFF on your USB.
If the data on your USB flash drive is not important or you have a backup, you can format the drive, which could disable the USB drive’s write protection.
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