backing up dvds

[Roland Smith]

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.
> 
> dd if=/dev/acd0 of=/path/to/filename.iso bs=1024

That should be bs=2048.

AFAIK, data CDs and DVDs have 2k blocks:

slackbox:~/tmp$ dd if=/dev/cd1 of=foo.dvd bs=1024
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=/dev/cd1 of=foo.dvd bs=2048
^C10270+0 records in
10270+0 records out
21032960 bytes transferred in 5.096854 secs (4126655 bytes/sec)

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