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I recently came across a Macintosh External Disk Drive, model M0130. When I opened it up to check the manufacture date (April of 1984), I also discovered that it had a rather odd model revision: OA-D34V-01. I was under the impression that only the original Sony OA-D34V and its revisions OA-D34V-02 and OA-D34V-22 existed as 400k drives. I tried looking up info about the specific drive revision on mine, but found nothing except the usual info on the 3 known 400k drives. Has anyone else here come across, or even heard of, the -01 revision before?
So I got my parts for restoring my upgraded 128k. The 400k drive was completely seized up which is to be expected. But there is a problem. After lubricating the drive, it was making a continuous clicking noise. I found out that it was the limit switch that homes with head. It was to far away for the little notch to block the light. I loosend the screw holding the switch in place and moved it back a little. The drive homed properly. The drive reads and writes perfectly, But only its own disks. It will not read any disks from any other known working drive. I have multiple 400k formatted disks fr