Odd floppy drives (was: Orbis
ard at p850ug1.demon.co.uk
Mon Sep 26 17:37:20 CDT 2005
> On 9/25/2005 at 10:34 PM ard at p850ug1.demon.co.uk wrote:
> >Since both 720K and 1.44M 3.5" disks (on a PC) rotate at 300 rpm, I am
> >trying to figure out why you'd want a 360rpm 3.5" drive. I've never seen
> >(600 rpm is another matter...)
> You've obviously never run into a NEC 9800 PC (or just about any other
Indeed I haven't.
> version of Japanese MS-DOS) diskette. 77 cylinders of 5x1024 sectors,
> spinning at 360 RPM, just like an 8" drive.
I am puzzled as to why that would spin at 360rpm. The format would be
possible on a '720K' drive turning at 300 rpm using the normal 250kbps
double-density data rate. If you double the data rate to 500kbps, you
should be able to get more that 5 sectors, even at the faster spindle
What was the data rate at the interface connector of these Japanese machines?
> Most USB drives understand this format automatically.
Not having got anything that supports the useless serial botch interface,
I've not looked at such drives.
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