I was thinking of building a PC with 4 500GB hard drives. And haveing a 2TB drive as a backup my question is, would it be better to use 4 500GB drives or just get 2 1TB drives. I'm worried because i read that RAID0 is limited by the smallest drive on the array and if i want to upgrade i don't want to have to swap out all my drives just to get more space. I figured if i use 1TB drives now when i want to upgrade i just need to buy one more TB drive instead of buying like 2 more 500GB drives. Also the case i'm getting only has 5 HD slots so that also poses an issue cuz if i upgrade in the future i need a bigger backup. Main question is would i get better performance with 2 1TBs or 4 500GBs. The TB drive has 32MB cache and the 500GB has 16MB cache. And how risky does it get when you have a big array i've never gone above a 2 HD RAID 0.