Thanks to all those who replied to this post. There were so many It takes too much time to reply to you all individually. It seems we can proceed with some confidence that these drives are _not_ UniDisks, and will work quite happily on a IIgs, or a IIe with a UDC card. That's just what I wanted to know. Peter Hinchliffe --> hinchlif@csuvax1.murdoch.edu.au WAppleII, Inc Western Australia