another find is this WD-2120D, a 120MB drive meant for the first IBM Thinkpads, like the 700 and 720. it is not IDE nor SCSI -- it is IBM ESDI, a poorly named drive interface that is effectively IDE but over Micro Channel and with a different register interface.
i imaged the drive, but it just contains the same garbage sector over and over again. the only thing that changes is this 32-bit number, which increments. i suppose it's been wiped.