28 Dec
2010
28 Dec
'10
12:17 p.m.
On 28 Dec 2010 at 11:48, Holley, Michael wrote:
The original Shugart SA400 minifloppy (August 1976)
only allowed 35
tracks. In early 1977 Wangco announced the Model 82 Micro Floppy that
allowed 40 tracks with new media.
Here is a photo of both disks.
http://commons.wikimedia.org/wiki/File:Verbatim_5.25_minidisk_tracks_1
97 8.jpg
I was about to mention that I seem to recall that the SA400 could
indeed write and read 40 cylinders, to the best of my recollection,
but that some early media didn't permit it.
And, to add a bit of stuff to the mix, the Micropolis 100 tpi 5.25"
floppies used 77 cylinders, with cylinder 0 offset outward a bit from
where a 96 TPI drive would put it.
And I don't recall how many cylinders the Shugart/Dysan 3.25"
floppies supported. 40? I could format one up and see...
--Chuck