Roland Smith wrote: > 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 > Roland is right, the blocksize is 2048 bytes. In fact the following page is a very nice read:
http://www.troubleshooters.com/linux/coasterless.htm The dd command would do a much more accurate image if you also specify the length. The process is described in the page above. _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"