29 Sep
1999
29 Sep
'99
10:31 a.m.
On Wed, 29 Sep 1999, Tony Duell wrote:
Tandon made some also. Some of the Vector Graphics machines used them.
I have been told that these were an early attempt at "quad density" that
was soon dropped in favor of the 2x48(96)tpi format.
- don
Now, do you
mean Tracks, or Tracks per Inch? TPI is the density of the
tracks themselves, with 35/40 track 5.25 inch drives usually used 48TPI.
8" drives were also normally 48tpi (and 77 tracks/side)
80-track 5.25 inchers (720K & 1.2M) used
96TPI, and all 3.5" drives that I
There were also some 100tpi 5.25" drives. Micropolis made them (for what
reason %deity only knows) and Commodore used them in things like the 8050. know of are
135TPI. I don't recall what TPI the old 2" drives in the Zenith
Is it 135tpi or 3/16mm between tracks (which works out at 135.46666
(135+7/15) tpi? I would suspect the latter, actually, based on the
manauls (and measurements) for a Sony drive I repaired a few months back.
-tony