From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pat LaVarre <p.lavarre@ieee.org>
Subject: Re: [PATCH] fix cdrom mt rainier probe
Date: 16 Jul 2004 10:19:11 -0600
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To: Jens Axboe <axboe@suse.de>
Cc: linux-scsi@vger.kernel.org

Jens A:

> Have you tested it works as expected as well, with
> rw and ro media?

Ouch, yes, please, never assume I've tested unless I say so explicitly.

So far I've just seen the expected, with one rewritable and one
read-only disc, in a pair of USB and PATAPI drives:

$ sudo plscsi /dev/scd0 /dev/hdd
export PLSCSI=/dev/scd0       // B Iomega   RRD              DB76
export PLSCSI=/dev/hdd        // @ Iomega   RRD              74.B
$
$ sudo blockdev --getro /dev/scd0 /dev/hdd
0
0
$
$ sudo dd of=/dev/scd0 bs=64K seek=0 count=1 if=/dev/zero
dd: opening `/dev/scd0': Read-only file system
$ sudo dd of=/dev/hdd bs=64K seek=0 count=1 if=/dev/zero
1+0 records in
1+0 records out
$
$ # swap discs
$
$ sudo dd of=/dev/scd0 bs=64K seek=0 count=1 if=/dev/zero
1+0 records in
1+0 records out
$ sudo dd of=/dev/hdd bs=64K seek=0 count=1 if=/dev/zero
dd: opening `/dev/hdd': Read-only file system
$

> looks perfect!

Excellent, I conclude I have understood correctly.

> Have you tested ...

I trust you will tell me if I can help further.

Pat LaVarre