It takes a special bridge board to handle two drives at one time. I have one case like that, but it only handles drives up to 128GB. If you get a case like that, you HAVE to have one drive master and the other set as slave because you have two drives on the same IDE bus. They can't both be a master and work properly. If you haven't worked a lot with PCs, you may not be familiar with this as most Macs that use IDE have the drives set to cable select. In that scenario, the location of the drive on the chain determines whether or not it's master or slave.

As far getting two enclosures or one, there are benefits and pitfalls to both. For your scenario, where you are going to get one drive for storage, and another one to back that drive up, I'd get separate enclosures. Separate enclosures mean more power cables, but usually the are less noisy than the ones that hold two drives. Personally I have one case with a single 160GB drive in it, one case with a single 80GB drive in it, and then a 3rd case that contains both a 120GB and an 80GB drive. (plus a couple of 2.5" cases for good measure :) )

Steve


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