So you wanna graduate up to a RAID setup do ya? Well how are you going to hook those dual drives onto your system? Head on over to PC Hardware to see if they found the answer for you as you check out their review of the Promise FastTrack100 TX2 Controller. Will this be the ticket for your mega storage desires? here's a snip:

"RAID 0 is based on idea to write/read data from multiple harddisks in the same time. The controller strips a file in smaller fragments of the user defined strip size and sends the fragments to every harddisk in the array. Supposing that you configure the controller to use a 32Kb strip size and you deal with a 256Kb file and you have two harddisks in the array every one of them receives simultaneous 4 fragments."