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SubjectRe: [OFFTOPIC] Re: disk head scheduling
> On Sun, 21 Mar 1999, Guy Sotomayor wrote:
>
>> (not a terribly fast drive) that has ~10000 cylinders (yes 10^4), 28 heads
>
> I was talking about physical cylinders. There is no way in hell you
> have 10,000 cylinders on a disk drive.
>
So was I. Why don't you think you can't have 10K cylinders on a disk?
From Seagate's own specs, there are 8334 TPI (tracks per inch). It's a
5.25" drive, so for the sake of argument, the disks are 4.5" diameter.
Reserve about an 1" for the center hub, halve, and you have 1.75" of
usable surface x 8334 TPI = 14584. The drive has 9996 cylinders, so in
actuality it's using about 1.2" of radius (or about 2.5").


TTFN - Guy


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