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 ci...@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!
