Yeah, but what you want is RAID5 (redundancy built in) not RAID0 (just stripping). Anyway, software RAID is not bad, especially if you do just RAID0.
The OneTouch - and a whole slew of other internal and external solutions, though most are SATA-based - supports RAID1 (mirroring = redundancy).
OK, there are many different types of RAID.
RAID0: This stores data over 2 or more drives: more storage, faster speed, but less reliable as more drives added.
RAID1: Store same data over 2 (or more?) drives: more reliable, but needs a second drive.
RAID5: Store data over 3 or more drives, with 1 (or more) drive having parity information. (Actually, the parity information is not stored on a single drive, but distributed across all of them.) You can recover from failure of a single drive and the array will still work. This has the speed/storage advantages of RAID0, but with more reliability. The disadvantage is that it requires a lot of CPU power to do all the number crunching. This is where you want an hardware controller, either on a PC card or built into the box of disks.
A typical setup for RAID5 would be: four 300G drives, one for redundancy, giving 3*300G=900G of storage. Or eight 300G drives, one redundant, giving 2100G of storage.
Richard