[aklug] Re: AV Utility: ddrescue is a handy disk, image DVD tool

On 8/17/13 10:45 PM, Greg Schmitz wrote:
>
> Since much of what I do involves audio-visual materials I thought I'd
> pass on a positive experience with GNU ddrescue
> <http://www.gnu.org/software/ddrescue/> We recently rec'd for deposit
> a DVD from a donor who indicated there were problems with the DVDs
> they had had made from video tape copies of some old film. I was
> unable to copy the DVD using conventional means on an Apple "Mac Pro,"
> a Pioneer PRV-LX1 (a dedicated linux based DVD duplicator/digitizer)
> or under Windows XP using a variety of tools. All of the tools I tried
> indicated that some of the files (.vob files) were damaged and
> unreadable.
>
> There was a thread on a list I read, "ARSC Recorded Sound Discussion
> List" <http://www.arsc-audio.org/arsclist.html> in which several folks
> suggested that CD and DVD burners and players can be out of alignment
> and this can lead to playback problems. Several folks said they'd had
> good luck with ddrescue so I thought I'd give it a try. I followed the
> instructions I found here:
> <http://sumofungus.wordpress.com/2010/01/19/making-backup-copies-of-damaged-dvds-using-ddrescue/>
> and after reading the ddrescue manual I successfully created a 9660
> iso disk image of the problem DVD (films from Alaska c. 1940). I'm
> wondering if anybody here has used the program and what your
> experience might have been?
>
> --greg
>

I should have noted that if you try to use ddrescue on a disk or DVD
that it is imperative that the disk should NOT mounted when you image
it. ddrescue will not complain if the target is mounted and the
resulting image, if the disk is mounted, might be of no use.

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Received on Sat Aug 17 22:54:04 2013