Help needed identifying old MFM drives from the excavation

Bill Degnan billdegnan at
Sun Dec 6 21:00:18 CST 2020

All IBM XT era drives.  I have, have had or have given away at least one of
these before.  Find a good working ibm xt and a genetic controller with a
manual and a copy of Spinrite software and test 'em.  These are all
stiction prone and bad cap vulnerable.

On Sun, Dec 6, 2020, 9:25 PM Chris Zach via cctalk <cctalk at>

> As the excavation of Bob's junkpile continues I have finally hit the MFM
> layer. Specifically about 10 5.25 hard disks that look to be old style
> MFM drives.
> Vertex V150
> Miniscribe 6085
> ST 4038M Seagate Franklin telecom AT-40
> Miniscribe 3650 HH
> Seagate ST4096
> Priam ID45-H
> Rodime RO203E
> RD54
> Real ST506
> Pair of ST412's.
> Anyone recognize what kinds of systems may have used these? The RD54 is
> of course DEC, and I'm guessing the ST506 and 412's were from either a
> Rainbow or a Professional/350. But the rest are weird. Maybe Convergent
> miniframes? Probably not PC's as Bob had a lot of weird stuff.
> Thoughts? I'll see if I can get a mfm reader and suck data into files I
> can post for others to read/try/giggle at. But as there isn't much
> labelling I have no idea what is on them.
> Also did find Wordperfect and speller for what I think is Rainbow on
> 5.25 floppies. Let me know if you need a copy, or if a copy exists in
> archives (also two DEC disks for Learning the Rainbow or something like
> that)
> Chris

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