Then you can just slap the controller in and attach the drives, assuming you have enough drive bays. This will more or less linearly append the partions together. Or, you might want to use regular software raid 0 and stripe them. Probabaly better performace than a append, though performance will be limited if multiple drives share a channel. There are integrated hardware solutions to do this too.
Some examples follow at the end.
But for 1.2 gig disks, it may not be cost effective to use one of the external solutions. If performance is important, dont put two drives on the same channel. If price is important, double them up. Unfortunately I think the most drives they support is 4. Not sure what level of linux support is available.