I can't copy any files to the drive. When I plug in the flash drive I get a popup saying that the drive needs to be formatted before it can be used. Most of the time I can't format it (gives errors - cannot format this drive), but even when I'm able to I still can't copy any files to the drive. I get the error "file or directory is corrupted and unreadable". I can't even run chkdsk on the drive. I've tried a number of programs to fix the drive: flash_repair 2.0, testdisk 6.14, icaredrs from here: http://freeware-fix.blogspot.com/2013/02/pen-drive-unreadable.html WinToolKit's USB boot prep reads the drive as RAW format, 1 partition, correct size, bootable false, status OK. Running it through the Quick or Full(format) options don't seem to change anything.