Well, not only do I need some for my PC, but I need to replace my moms in her old stone age PC, it's about 6-8 yrs old and could die any second, she has a lot of irreplaceable stuff on it so I'm gonna put one or two in it, then there's the hp one Im using now till I get all my stuff, I may put one in it, and all the others are for me. I wanted more than one for backups, seperation and what not, I think I'm gonna set it up like this: OSes "XP,Vista, maybe 7 soon, possibly OSX too" on one, games and programs on another, pictures/files like pictures and stuff on another one, and backup/recovery data on the last one.