What 2.5-inch IDE hard drives are known to work with the A1200?
A. Most do, although you may have to adjust the MaxTransfer value (see above). I personally dislike the Seagate drives included with many A1200s (which seem to be of low quality), but they work fine for many people. My own Toshiba worked fine, although, like many drives, it had the slow spin-up problem.
