15 Nov
2017
15 Nov
'17
9:59 a.m.
> Note that there were always some exceptions.
> Weltec made a 5.25" drive at 180 RPM, to do "HIGH
DENSITY"/"1.2M" at
> 250,000 bits per second on PC/XT.
>
> Sony made some 3.5" drives that were 600 RPM, to use 500,000 bits per
> second.
>
> NEC used 360 RPM 3.5" drives, to have the same format structure on their 8"
> "DOUBLE DENSITY", 5.25" "HIGH DENSITY", and 3.5"
"HIGH DENSITY". Sometimes
> called "Type 3"
>
> Epson (Geneva PX-8) used a 3.5" with 67.5 tpi, instead of the common 135tpi
>
> Can you name another 20 exceptions??? (Chuck and Tony probably can)
>
>
> --
> Grumpy Ol' Fred???????????? cisin at xenosoft.com
On Wed, 15 Nov 2017, Paul
Berger via cctalk wrote:
HP used 3.5" drives made by Sony that rotated at
600 RPM twice the data rate
but same density.
One of my favorite examples; mentioned about a dozen lines up!