PC won't mount or open drive, it simply says 'Do you want to format now', what can I do?

I've created a Xbox Usb by join the end of a Xbox and the end of Usb Cable.

It was working fine like a removable disk. Dashboard says 'controler 2', the EVO thing display as 'drive J'. I'm very happy that worked, but at my PC it doesn't want to mount or open, is simply says 'Do you want to format now'. And I checked the format, is in RAW not FAT or NTFS. what can I do?

Please help!

 

it's xfat .. you need something that understands that file system... x360explorer should read it... ..or nice linux that understands it out of the box as long as it's told the file system at the mountpoint.