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SubjectRe: [OFFTOPIC] Re: disk head scheduling
Date
In article <19990322111545.21395@twilight.ucw.cz>,
Vojtech Pavlik <vojtech@twilight.ucw.cz> wrote:
>On Sun, Mar 21, 1999 at 11:15:30PM -0500, Richard B. Johnson wrote:
>
>Interleaving died fairly soon, and as far as I know was never needed since
>that time.
>
>> In recent years, the emphasis has been upon increasing the storage
>> capacity of these Disc drives. The storage capacity, which used
>> to be specified in terms of kilobits per square inch, called
>> areal density, is now specified in terms of gigabits per linear
>> centimeter.

>It's more likely a necessity. Any other interleave would slow the
>drive down, which isn't at all what manufacturers wish. They could
>just let it spin slower ...
>
>> Expensive disk drives now do full track buffering. This costs

Exactly. They read and write from a full track buffer. The ordering of the
sectors on the physical media can be in a totally random order. The drive
electronics simply start reading or writing the appropriate sector to or from
the appropriate buffer location when the head is over the start of a sector
that needs to be read or written.

--
Stuart Lynne <sl@fireplug.net> 604-461-7532 <http://edge.fireplug.net>
PGP Fingerprint: 28 E2 A0 15 99 62 9A 00 88 EC A3 EE 2D 1C 15 68

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