Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!amdahl!kevin
From: kevin@uts.amdahl.com (Kevin Clague)
Newsgroups: comp.sys.amiga
Subject: Re: 15 Head Hard drive and the A2090(a)
Message-ID: <5a=x02hZ2cqg01@amdahl.uts.amdahl.com>
Date: 25 May 89 06:07:50 GMT
References: <1735@dciem.dciem.dnd.ca> <680@dialog.UUCP> <040b02ba29ZN01@amdahl.uts.amdahl.com> <1750@dciem.dciem.dnd.ca>
Reply-To: kevin@amdahl.uts.amdahl.com (Kevin Clague)
Organization: Amdahl Corporation,  Sunnyvale, CA 94086
Lines: 38

In article <1750@dciem.dciem.dnd.ca> chk@dretor.dciem.dnd.ca (C. Harald Koch) writes:
>In article <040b02ba29ZN01@amdahl.uts.amdahl.com> kevin@amdahl.uts.amdahl.com (Kevin Clague) writes:
>>The moral is that you can lie all you want about the physical
>>configuration of a SCSI drive.  The only NO-NO is to tell the
>>system that the drive has more blocks than it has.
>
>There is a problem with this: someday The Powers That Be may come up with a
>file system for the Amiga that tries to optimize disk layout and disk block
>allocation. (A simple optimization is avoiding track to track seeks wherever
>possible.) If this happens, you would get the best performance out of your
>drive by *not* lying to the file system.
>
>The moral? DON'T lie to the system unless you have to. (I seem to remember
>that the 2090 does not like >63 sectors/track or something like that, in
>which case you *do* have to lie.)

Or in my case I have a Quantum Prodrive 80S which has two zones of block 
density.  The inner zone has less blocks per track than the outer zone.
I cannot tell the system the truth about my drive.  

I choose the factors that gave me the best performance for the current system.

>
>-- 
>C. Harald Koch		NTT Systems, Inc., Toronto, ON Canada
>chk@gpu.utcs.utoronto.ca, chk@dretor.dciem.dnd.ca, chk@chkent.UUCP

Kevin


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[  Any thoughts or opinions which may or may not have been expressed  ]
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