Re: Blockbusting news, results end

[bill davidsen]

In article <785F348679A4D5119A0C009027DE33C105CDB3CA@xxxxxxxxxxxxxxxxxxxxxxx>,
Mudama, Eric <eric_mudama@xxxxxxxxxx> wrote:
| 
| 
| > -----Original Message-----
| > From: Norman Diamond

| > It is really hard to imagine a physical sector still being 
| > 512B because the inter-sector gaps would take some huge
| > multiple of the space occupied by the sectors.
| 
| We measure these gaps in nanoseconds.  They're not that huge.  But yes,
| moving to a larger standard sector size would get you a significantly larger
| disk drive built from the same parts.

Given that we did that back in the CP/M days (late 70's) on floppy, and
with MFM, RLL and finally SCSI drives in the 70's, I would hope that
current drives use large sectors since the drive now has local cache
and doesn't need a fancy driver to do the caching!

| > I'm sure the physical sectors are not 512B.
| 
| I'm sure you're wrong.
| 
| I'd imagine that since Seagate and WD and Maxtor are constantly duking it
| out to release the next generation of capacity, and we all wind up producing
| nearly-identical products when all is said and done, that they're using 512B
| data sectors also.

Given that the IRG is fixed size regardless of sector size, I certainly
hope I misread what you say or you are incorrect. The difference
between 512B and 4KB sectors should be about 20-40% added capacity per
track (seven IRG sizes). I would expect large sectors would be
standard.

We used to diddle interleave when formatting as well, until we put full
track caching in the device driver.
-- 
bill davidsen <davidsen@xxxxxxx>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
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