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From: src@scuzzy.in-berlin.de (Heiko Blume)
Newsgroups: comp.periphs.scsi
Subject: Re: Adaptec AHA-1740 on ISC 2.2 ?
Message-ID: <1991Apr01.003702.2929@scuzzy.in-berlin.de>
Date: 1 Apr 91 00:37:02 GMT
References: <28017@jet.uucp> <283400085@adaptx1> <1991Mar30.060122.24469@ajfcal.uucp>
Organization: Contributed Software
Lines: 31

tony@ajfcal.uucp (Tony Field) writes:
>Why does the 1740 spoof head/cylinder numbers? I have a 670 MB Hitachi
>drive tied to the Adaptec. When the hard disk setup shows you the drive
>configuration, it indicates 64 heads and ~630 cylinders. This looks like
>a "1024 cylinder spoof" since the Hitachi drive has more than 1024
>cylinders.

yep, that is for MESS-DOS, of course.

> Unfortunately, you cannot enter the drive defect table unless
>you know the spoofing algorithm.

there is no point in using the unix defect tables for scsi disks.
the drives themselves handle all that for you (although you
might have to tell them with SCSICNTL). most even reallocate
defective sectors transparently on the fly, but the block numbers
do NOT become invalid, so there's no need to tell unix.

>The Adaptec bios cannot be turned off - if it is turned off, it will
>not run under ISC.

nothing can run if it's turned off :-)

>Is there any way to turn off the spoofing???

no. just verify the drive with the bios routines to make sure.
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