You said Mac.
Did you format it in Mac at some point?
If you did, you're never going to get Windows to format it until you clear out the boot sector.
You can use KillDisk (freeware) to write a single pass of 0's to the drive, and then Windows will format it.
Did you format it in Mac at some point?
If you did, you're never going to get Windows to format it until you clear out the boot sector.
You can use KillDisk (freeware) to write a single pass of 0's to the drive, and then Windows will format it.