3.5" floppy drive question(s)

[Philip Pemberton]

Fred Cisin wrote:
> Nobody has successfully used a 3.5" at 150RPM.  Yet.
> Besides the "normal" 300RPM drives, there are some 600RPM (old Sony), and
> 360RPM (NEC and a few others)

What about the old Amiga high-density drives that ran at 300RPM for DSDD and 
150RPM for DSHD?

The story I heard was that it worked out cheaper for CBM to get a bunch of 
speed-switching floppy drives made up instead of modifying the disc controller 
to support multiple data rates. I'm not sure I believe that...

But yes, there were 600RPM 3.5" drives -- some Hewlett-Packard logic analysers 
(1650A/B series mainly, IIRC) used them.

-- 
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/