My USB Still does not work since when i try to format it, it says that I need to insert a disk into drive F: and when i try to access my usb it also says to insert a disk into drive F:. My USB did not work after I had left it in while I was compressing the C: drive to save space. Under file systems in the USB properties it says that it is "raw" and its capacity is "0 bytes". Any ideas on how to fix it.