Date: Sun, 14 Jul 1996 10:04:15 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-scsi@freebsd.org Cc: Stephen.Couchman@imagenet.on.ca, freebsd-questions@freebsd.org, n_melhor@Telebit.COM Subject: Re: Jaz drive questions Message-ID: <199607140804.KAA15641@uriah.heep.sax.de> In-Reply-To: <199607132245.IAA03964@godzilla.zeta.org.au> from Bruce Evans at "Jul 14, 96 08:45:47 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 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. ;-)
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