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Date:      Sun, 1 Jul 2007 09:39:09 -0500
From:      Jonathan Horne <freebsd@dfwlp.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: backing up dvds
Message-ID:  <200707010939.09739.freebsd@dfwlp.com>
In-Reply-To: <46878DCD.8060604@otenet.gr>
References:  <000301c7bb60$264eee30$0200a8c0@satellite> <20070701101326.GB63587@slackbox.xs4all.nl> <46878DCD.8060604@otenet.gr>

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On Sunday 01 July 2007 06:19:41 Manolis Kiagias wrote:
> 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.
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hehe, shame on me for trying to recall that memory, instead of actually 
looking it up (which is exactly what i do, each time to run an .iso file 
off... just to make sure im remembering correctly!)

cheers,
-- 
Jonathan Horne
http://dfwlpiki.dfwlp.org
freebsd@dfwlp.com



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