backing up dvds

Roland Smith rsmith at
Sun Jul 1 10:13:32 UTC 2007

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)

[plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
pgp: 1A2B 477F 9970 BA3C 2914  B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url :

More information about the freebsd-questions mailing list