Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!jato!vsnyder
From: vsnyder@jato.jpl.nasa.gov (Van Snyder)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Bad.sector.list on HD-s?
Message-ID: <1991Mar8.214255.11914@jato.jpl.nasa.gov>
Date: 8 Mar 91 21:42:55 GMT
References: <9103080835.AA07030@grape.ecs.clarkson.edu>
Reply-To: vsnyder@jato.Jpl.Nasa.Gov (Van Snyder)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 26

In article <9103080835.AA07030@grape.ecs.clarkson.edu> cae@sdfvm1.vnet.ibm.com (Cornelius Caesar) writes:
>In article <1991Mar8.003618.25646@jato.jpl.nasa.gov>
>  vsnyder@jato.jpl.nasa.gov (Van Snyder) writes:
>>The SCSI protocol allows one to send a defect list with the Format
>>command.  But I don't know any low-level HD formatting programs for the ST
>>that allow you to specify the defects, so the program can put them in the SCSI
>>Format command.  Anybody out there know of such a formatting program?
>
>The easiest way to use a partially bad HD is to just mark the bad sectors
>in the FAT as used (FFF7 or something) so they will never be allocated
>again. Of course an optimizer might find them as lost clusters again...
>
>Cornelius                                        cae@sdfvm1.vnet.ibm.com

My disk drive has numbers like "cylinder head bytes-from-index" in the
defect list that accompanied it.  How do I turn these into FAT indices?  I
don't want to rely on high-level read\write tests to discover them, because
the manufacturer applied stricter tests than one can do with ordinary I/O.
I'd rather not write data where the manufacturer thinks his product is
marginal, only to have it disappear without warning (that is, between being
written and the first subsequent backup).

-- 
vsnyder@jato.Jpl.Nasa.Gov
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