non-PC Floppy imaging

Lyle Bickley lbickley at
Mon Jan 8 00:33:38 CST 2018

Hi Guy,

I just copied several IBM 8" Maintenance Device (MD) Diskettes - and
verified that the copies work on the IBM MD. They seem to be in an IBM
3x0 format (with a standard IBM VTOC).

Track 0 on the diskettes is 128 byte sectors,
Tracks 1 through 76 are 256 byte sectors.
The diskettes are DSSD.

(So you need a Shugart 850/851 (or equivalent) to make the copies).

I used both Teledisk and IMD - and both successfully captured and
re-created the diskettes correctly.

More in editing IBM images later...


On Fri, 5 Jan 2018 11:52:56 -0800
Guy Sotomayor via cctalk <cctalk at> wrote:

> Hi,
> I now have a number of uCode diskettes for my IBM 4331.  I would
> somehow like to image them so: a) I have backups in case the floppies
> themselves go bad b) be able to investigate their contents in case I
> have to “merge” the contents of multiple floppies to make a single
> good one
> These are all 8” diskettes.
> The complicating factors in all of this are:
> a) any text (e.g. strings) are going to be in EBCDIC rather than ASCII
> b) each uCode diskette was presumably serialized to the CPU it was for
> c) not sure what the “on-disk” structure looks like
> d) the only 8” diskette drives that I have are in IBM (non-PC)
> equipment
> Any ideas/comments would be welcome.
> Thanks.
> TTFN - Guy

73      AF6WS
Bickley Consulting West Inc.

"Black holes are where God is dividing by zero"

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