2-Drive RAID enclosures.

I bought a 500 GB LaCie Big Disk a couple of months ago, but I didn't do enough research: it's two 3.5" 250 GB IDE drives, inside a nice aluminum case with a circuit board that makes the appear as a single volume on my desktop. The problem? I haven't really solved my redundant data issue. I'll be able to store a bunch of information to it, but it'll still be just one copy of the data. Worse yet, since the drives are written to randomly, I now have two sets of drive hardware that can fail. I've basically made my system no less fault-tolerant, and twice as fault-prone. Back to the drawing board.

I'm now in the hunt for a cheap, true RAID case. At this point, I'm still open to software (OS-level) versus hardware (in-case circuit board) RAID control, and I've found a couple of options.

Link: MINI 3.5'' SATA Dual Drive Aluminum Enclosure with SATA Output.

Link: DUAL DRIVE FIREWIRE 800/400 OXFORD 912 ALUMINUM MINI RAID ENCLOSURE .