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Date: Sun, 01 Sep 2013 18:40:03 +0200
From: "Thomas Schmitt" <scdbackup@gmx.net>
To: freebsd-stable@freebsd.org
Subject: Re: Lost CAM Access to DVD Writer
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Hi,

> >> :-( Unable to CAMGETPASSTHRU for /dev/cd0 Inappropriate ioctl for device.
>
> Could someone else try to make a 'dump to DVD' backup [...]
> /sbin/dump -0u  -L -C16 -B4589840 -P 'growisofs -Z /dev/cd0=/dev/fd/0' /u

A test with less disk load would be to write e.g. 100 MB of zeros
to e.g. DVD+RW media (in order to reduce waste):

  dd if=/dev/zero bs=1M count=100 | growisofs -Z /dev/cd0=/dev/fd/0


Have a nice day :)

Thomas