Path: utzoo!attcan!uunet!mcsun!ukc!strath-cs!cs.glasgow.ac.uk!icdoc!inmos!inmos-is!gary
From: gary@brb.isnet.inmos.co.uk
Newsgroups: comp.sys.atari.st
Subject: Adaptec 4000A Bad Sector List Query
Message-ID: <186.270cc984@brb.isnet.inmos.co.uk>
Date: 5 Oct 90 17:57:24 GMT
References: <1363@tnosoes.izf.tno.nl> <1990Sep28.195230.9880@cbnewsl.att.com> <3139@medusa.informatik.uni-erlangen.de> <1990Oct2.131933.18588@cbnewsl.att.com>
Organization: Inmos Limited
Lines: 29

In article <1990Oct2.131933.18588@cbnewsl.att.com>, hojo@cbnewsl.att.com (HC Johnson) writes:
> 
> I have never heard of an Adaptec problem.  I have 2 Adaptec 4000A and the
> Atari clone (in a SH204).  All of them properly accept the bad bit map
> (could be called bad sector list) and map them out perfectly.  I know they
> are doing it right because I have drives that completely died using the old
> HDX and that is why I wrote my own formatter.
> 
> Howard Johnson

I am intrigued by this. 

Does the Adaptec 4000A have some non-volatile memory in which the bad 
sector list is stored?
-or-
Does the Adaptec have some RAM in which the list is stored, which is stored
on the disk and automatically read by the Adaptec on power-on?
-or- 
Does the Adaptec have some RAM ... , which has to be initialised by the
driver software (booted from sector 0?), which knows where the bad sector
list is stored on the disk?

--Gary 
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Gary Morton   Inmos Ltd, Aztec West, Bristol | EMail(UK) 
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The opinions above are my personal views     | EMail(ROW)
and may not reflect Inmos policy.            | gary@brb.isnet.inmos.com
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