IBM 8" Disks - What are they?

28 Apr 2000

...
  3340 MICRO
DIAGNOSTIC DISKETTE   **M.T.=5412**  I don't know about the others, but the IBM
3340 was the *original*
 Winchester drive.  (Not "a" Winchester, but *The* Winchester.) 
If so, wouldn't those be the original IBM "Minnow" diskettes, which
are not compatible with the later 3740 and System/3 formats that became
industry-standard?

The Minnow was a 90 RPM read-only drive.  It was hard-sectored, and the
index/sector hole was near the edge of the diskette rather than near
the hub.  It was specifically designed for loading microcode on System/370
CPUs and peripheral controllers (such as disk systems).

The IBM Figaro drive, later shortened to "Igar", was the first
"modern"
read-write 360 RPM single-density 8-inch drive.

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IBM 8" Disks - What are they?