I don't really think the hdds have a key "per xbox" to say. If you really think about it, remember how they made memory cards so you could move gamesaves? Wouldn't a 20G hdd the size of a laptop hdd be easier? Then instead of JUST game saves, you've got music, video clips, everything you've saved on it.... I think they chose a mini-hdd because they WANTED you to move it. Look at how they did the psu, it's not tiny, I really don't think they were like "were going to make some uber psu so you can move the system wherever you want....". I think there idea is that everyone will want the xbox360.... So why not just give people small hdd's so you can move them! On the note of a FS, I would seem it feasable that they could have made an XBFS, that doesn't seem like a bad idea. FAT32 had many problems, quite a few when it came to organizing data...