QUOTE
You can use an MP3 player as an xbox memory card, and it could work very well, just expect not to use it again to listen to your new Green Day album. It's because the way that the player if formatted: For example, you format you player to the FATX file system (the type on your Xbox), but, usually, your MP3 player maybe on a FAT to FAT32 file system, and you might not know which one. So, if you don't know what system to put it on. and if you use Windows XP, it will usually only allow you to format it to FAT or FAT32. So, IF you screw up the way you format it, you could be down $150 to $400. So, i wouldn't recommend using an MP3 player or any other USB storage device that has any other purpose than a storage device. This includes MP3 players, PDA's, gaming systems, GPS modules, etc.
Dont do it:)