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Date:      Sun, 1 Jul 2007 12:13:26 +0200
From:      Roland Smith <rsmith@xs4all.nl>
To:        Jonathan Horne <freebsd@dfwlp.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: backing up dvds
Message-ID:  <20070701101326.GB63587@slackbox.xs4all.nl>
In-Reply-To: <200706301739.29249.freebsd@dfwlp.com>
References:  <000301c7bb60$264eee30$0200a8c0@satellite> <200706301739.29249.freebsd@dfwlp.com>

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On Sat, Jun 30, 2007 at 05:39:29PM -0500, Jonathan Horne wrote:
> On Saturday 30 June 2007 16:46:36 Dave wrote:
> > Hello,
> >     I've got a 6.2 box with a dvd writer in it. I want to back up some =
dvds
> > to iso files so i can recreate the dvds at a later time should it be
> > needed. I can use dvdbackup to backup in to a directory structure, but =
i'd
> > rather not mount, create the directory, and iso, i'd rather make the iso
> > directly from the dvd. Any pointers on this?
> > Thanks.
> > Dave.
>=20
> dd if=3D/dev/acd0 of=3D/path/to/filename.iso bs=3D1024

That should be bs=3D2048.

AFAIK, data CDs and DVDs have 2k blocks:

slackbox:~/tmp$ dd if=3D/dev/cd1 of=3Dfoo.dvd bs=3D1024
dd: /dev/cd1: Invalid argument
0+0 records in
0+0 records out
0 bytes transferred in 0.000146 secs (0 bytes/sec)

slackbox:~/tmp$ dd if=3D/dev/cd1 of=3Dfoo.dvd bs=3D2048
^C10270+0 records in
10270+0 records out
21032960 bytes transferred in 5.096854 secs (4126655 bytes/sec)

Roland
--=20
R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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