PowerBook 190cs at work. I think it uses a SCSI drive. Next week I'll extract the HDD and give it another go.
If you have the SCSI Dock cable (like a normal Powerbook SCSI cable, but with a switch at the Powerbook end for docking mode) you can use the 190 as a bootable external drive without dismantling it.
my little 2.5" SCSI drive that I pulled form a non-working PowerBook is dead.
One thing I have heard discussed as a possibility, but not tried myself, is to find a matching IDE drive - same exact size, same manufacturer, same everything - and swap the controller boards over. I have vague memories of that working for someone, but, of course, at your own risk/further research is encouraged/YMMV etc.
