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Subject: Re: Jaz drive questions
To: joerg_wunsch@uriah.heep.sax.de
Date: Sun, 14 Jul 1996 03:04:02 -0700 (PDT)
From: "JULIAN Elischer" <julian@ref.tfs.com>
Cc: freebsd-scsi@freebsd.org, Stephen.Couchman@imagenet.on.ca,
        freebsd-questions@freebsd.org, n_melhor@Telebit.COM
In-Reply-To: <199607140804.KAA15641@uriah.heep.sax.de> from "J Wunsch" at Jul 14, 96 10:04:15 am
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> 
> As Bruce Evans wrote:
> 
> > >  sd1(ahc0:2:0): ILLEGAL REQUEST asc:24,0 Invalid field in 
> > >  CDB sd1 could not mode sense (4). Using ficticious 
> > >  geometry 1021MB (2091050 512 byte sectors)
> > 
> > This means that FreeBSD _did_ recognize the drive.  Iomega apparently
> > didn't bother to implement the SCSI mode sense command, so the driver
> > can't determine anything about the number of heads or sectors/track
> > on the disk (if any).
> 
> That's not true.  Of course, they did implement a MODE SENSE command
> (it's optional per the SCSI specs, but certainly implemented in any
> disk drive).  It's possible that they didn't implement mode page 4
> ("Rigid disk drive geometry page"), or that FreeBSD has some other
> incorrect setting when performing the MODE SENSE.  You will only be
> sure after turning on debugging, and comparing step by step with
> IOmega's SCSI specs.
the geometry is in fact unimportant..
the ficticious one should work just fine..

> 
> The claimed number of sectors looks highly suspicious: it's IMHO
> 10 x too large.
> 
> -- 
> cheers, J"org
> 
> joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
> Never trust an operating system you don't have sources for. ;-)
>