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need to recover usb drive

Posted: 23 Oct 2014, 18:32
by cfli1688c1
i have a 8bg usb drive that was damaged when i removed it from a windows 8.1 machine, without waiting for it to finish.
I used testdisk and it said both boot sector and backup is bad. I did the repair boot sector option, but it still come back as both bad on the boot sector and backup.

what can i do more to fix this?