> I realized I also don't know the RD31 and RD32. The rest of the list I found long ago is: RD31 Seagate ST-225 20 MB RD32 Seagate ST-251 42 MB RD51 Seagate ST-412 10 MB RD52 Quantum Q540 31 MB It's clearly incomplete, as you found there were two different devices used for one of th RD models. De