• Subject: Re: Record Length - Trivia
  • From: email@xxxxxxxxxxxxxxxxxxx (James W Kilgore)
  • Date: Thu, 14 Oct 1999 16:17:31 -0700
  • Organization: Progressive Data Systems, Inc.

Sector size, multiple of, or evenly divisible into was the rule I
learned when the Earth's crust was still cooling.

Since then, it's been the amount of data a disk arm can read without
introducing a rotational delay or evenly divisible into.  The "evenly
divisible into" is because any subsequent reads don't actually perform
any disk IO.

Like you, I stopped worrying about it long ago.  AFAIK, different
drives/controllers are optimized for either a high number of short
bursts or a low number of large bursts.

Oh, oh, I've got the answer: It depends! <VBG>

Pat Barber wrote:
> John P Carr wrote:
> >
> > >>John P Carr wrote:
> > >> If there were such a thing as an optimal record length what would it be ?
> >
> > Something like that.  On the CISC machines,  John Sears once said it would
> > be 31 bytes because of something like you said.
> John:
> I can't remember that "cute" number(nobody cares anymore) but I "think"
> it was 256 for the CISC and it jumped to 512 for the risc... but I been
> wrong before. Back before we had machines with a gazillion disk bytes,
> I paid attention to that sort of thing..
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