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Date:      Sat, 7 Jun 1997 10:36:46 +0200
From:      j@uriah.heep.sax.de (J Wunsch)
To:        scsi@freebsd.org
Cc:        tom@tomqnx.com (Tom Torrance at home)
Subject:   Re: CD-R & SCSI Problems
Message-ID:  <19970607103646.LS18353@uriah.heep.sax.de>
In-Reply-To: <m0waDEz-000A2UC@TomQNX.tomqnx.com>; from Tom Torrance at home on Jun 7, 1997 00:36:37 -0400
References:  <33984DF9.2781E494@whistle.com> <m0waDEz-000A2UC@TomQNX.tomqnx.com>

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(Moved to the scsi list, that's what it is for.)

As Tom Torrance at home wrote:

> You are absolutely correct. ANother unfounded assumption bites the
> dust.  I have absolutely no idea what is causing this, it seems to
> happen every time the tape is either opened or closed - and 'seems'
> to cause no harm.

Turn on SCSIDEBUG, and see which command is causing it.  It might be a
LOAD UNLOAD MEDIUM, or PREVENT ALLOW MEDIUM REMOVAL.

> THe tape drive is an HP Colorado T4000 running off my ahc AHA-2740A.

It wouldn't surprise me if the SCSI implementation of these drives
weren't the brightest.  We've recently seen similar (worse, i think)
examples for a cheap Conner tape.  The behaviour of this drive made me
shout that it's apparently a drive that has a 50-pin connector looking
like SCSI, but it isn't really SCSI.  (It violated the specs all over
the place, they didn't even bother to implement some mandatory
commands.)

-- 
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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