The Pinnacle Micro MO stuff offered two types of media; 512 byte and 1024
byte sectors. I've got an Apex 4.3GB 512-byte sector cart around here
someplace. The drives would die if you looked at them cross-eyed--and I
think the miserable field record of the Apex drives contributed to the
eventual bankruptcy of Pinnacle.
Youi can still find the drives on ePay. In my experience, if you find one
that looks like a good deal, the seller will not warrant that it works.
Cheers,
Chuck