I'd hazard a guess that this contains information about the specific USB device it was placed on originally. This has to do with the way the Xbox 360 formats USB drives if you inspect the numbered 'Data' files on the 360 formatted USB drive, you'll likely find one in particular that seems especially small. If you lose that USB drive, the saves you backed up are useless – for now, anyway. If you back up saves from a USB device on to your PC or some other location, you can only put those saves back on to the original USB device. Since your PC just sees the files created by the 360 as unreadable archives, you can't explore those file folders (yet, though we're sure enterprising hackers will address that at some point), but you can copy them, meaning you can, in a manner of speaking, back up your saves. Back Up Your Saves When you put in an Xbox 360 formatted drive into your PC with hidden folders set to visible, you can actually see the folder created by the 360 to store your saves. Just make sure that you choose 'Configure' if there's stuff on the USB drive you want to save. After selecting it, you're given the option to format it for the 360 or configure it, which allows you to adjust the amount of space the 360 will reserve on the drive. From there, your USB drive should appear as an unformatted memory unit.

After inserting a USB device, I simply navigated to the system settings area and selected 'Memory'. It's Easy It's surprisingly effortless to format a USB device for the Xbox 360, once you know how to do so anyway.

How to format usb drive for xbox one