From owner-freebsd-scsi  Mon Aug 25 21:25:06 1997
Return-Path: <owner-freebsd-scsi>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id VAA05472
          for freebsd-scsi-outgoing; Mon, 25 Aug 1997 21:25:06 -0700 (PDT)
Received: from cyrix.com (cyrix.com [147.5.99.99])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id VAA05467
          for <freebsd-scsi@FreeBSD.ORG>; Mon, 25 Aug 1997 21:25:03 -0700 (PDT)
Received: from hydra.cyrix.com ([147.5.12.23]) by cyrix.com (8.7.1/8.7.1) with SMTP id XAA17806; Mon, 25 Aug 1997 23:25:00 -0500 (CDT)
Received: from mega.eng.cyrix.com by hydra.cyrix.com (4.1/SMI-4.1)
	id AA25786; Mon, 25 Aug 97 23:24:59 CDT
Received: by mega.eng.cyrix.com (SMI-8.6/SMI-SVR4)
	id XAA15735; Mon, 25 Aug 1997 23:24:58 -0500
From: bartling@cyrix.com (Steve Bartling)
Message-Id: <199708260424.XAA15735@mega.eng.cyrix.com>
Subject: Re: Freebsd2.2.2, adaptec 1742A and Ultra SCSI drive
To: gibbs@plutotech.com (Justin T. Gibbs)
Date: Mon, 25 Aug 1997 23:24:57 -0500 (CDT)
Cc: bartling@cyrix.com, freebsd-scsi@FreeBSD.ORG, dietz@cyrix.com,
        gregg@cyrix.com
In-Reply-To: <199708260334.VAA29484@pluto.plutotech.com> from "Justin T. Gibbs" at Aug 25, 97 09:33:08 pm
X-Mailer: ELM [version 2.4 PL25]
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-scsi@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


> 
> >I replaced a defective Micropolis 2217 1.7 Gig Fast SCSI-2
> >drive with a new ultra scsi Micropolis 4743NS.
> 
> You may want to try playing around with mode page two on
> the drive.  I remeber that the Atlas I wouldn't work on the 1742A
> unless you slowed it down a little bit.  It seems that if you
> cut your bus signal times close to the minimum the spec allows,
> the 1742 becomes confused.  There is probably a FAQ entry
> somewhere on Quantum's web site that talks about the problem
> the Atlas I had and hopefully the solution they give is not
> vendor specific and can be used on your 4743NS.
> 
> --
> Justin T. Gibbs
> ===========================================
>   FreeBSD: Turning PCs into workstations
> ===========================================
> 

Gracias Amigo,

I checked the quantum web site ... no mention of this 
issue under their FAQ's, etc. Most of the info there
is very, very tame and generic. No detailed info was
available.

By the way, how to I go about toying with the disk
parameters ( for this drive only ) under freebsd ?

I have started digging through the source code, but
I am clueless where to start.

Thanks for the help so far.

- Steven Bartling

P.S. Again, everyone please respond to me directly as
     I am not currently subscribed to the freebsd-scsi
     mailing list. I'll bounce the responses to the 
     mailing list as appropriate.