See the spoiler for a full explanation. [spoiler]My Xbox 360 came with a 20 GB HDD and I stuck with it for a long time until about a year ago when I picked up an Xbox 360 120 GB HDD for super cheep at a pawn shop. After transferring over all my data to the larger HDD for the Xbox, I took the old one apart and now I use it as 20 GB of external storage for my computer. But now that I don't play my Xbox 360 as much as I used to, I'd like to switch back to the way things used to be so I can use the larger 120 GB HDD as externals storage for my computer. Unfortunately, I don't know how to reprogram the 20 GB HDD so my Xbox 360 can use it, and that's where I'm looking for help.[/spoiler] [b][u]TL;DR:[/u] How do I reprogram a 20 GB HDD for a PC so it works with my Xbox 360?[/b]