Re: [gentoo-user] dd if=/dev/dvd of=backup.iso

[Nick Rout <nick@rout.co.nz>]

On Wed, 15 Mar 2006 15:55:17 -0700
Joseph wrote:

> On Thu, 2006-03-16 at 11:19 +1300, Nick Rout wrote:
> > On Wed, 15 Mar 2006 15:04:06 -0700
> > Joseph wrote:
> > 
> > > > > If I use:
> > > > > dd if=/dev/dvd of=backup.iso
> > > > 
> > > > First of all, I would add the "bs" option to increase the buffer and therefore 
> > > > speed. Something like:
> > > > dd bs=100000 if=/dev/dvd of=backup.iso
> > > 
> > > No, this command didn't work either, I got about 700Mb and it quit,
> > > though the light in the drive was flashing nothing was copied to ISO
> > > file.
> > > 
> > > > 
> > > > > I only get about 2Gb file and it stops or freezes, the disk is bout
> > > > > 4.3Gb
> > > > 
> > > > That would indicate read errors. Is the dvd scratched or dirty? Wash it with 
> > > > lukewarm water and dishwasher liquid and try again.
> > > 
> > > DVD is brand new, no scratches. 
> > 
> > could be the reader then? Do you have another computer with a dvd drive
> > and 4.7g available space?
> 
> Yes, I've tired on two different systems, one is x86 and the other amd64
> with similar result on both of them; the copying stops at some point and
> doesn't go any further.
> One system has Philips DVD drive and the other one has BenQ DVD 
> 
> I can burn perfect DVD every time but getting it back in form of ISO
> from DVD is a pain - IMPOSSIBLE. 
> 
> > these things are fiddly, there are billions of little holes and a laser
> > light reading them. There are manufacturing tolerances in the reader and
> > the disk. There are imperfect firmwares in the drives. In short,
> > sometimes a particular disk and a particular drive just don't get on.
> > The drives also get old and tired. IMHO you need to be prepared to throw
> > the drive out after some indeterminate (but not long enough) period and
> > get a new one.
> > 
> > Is this a movie or data? Have you tried just mounting then copying the
> > files to your hard drive. This might identify where on the disk things
> > are going wrong. If it is a small or unimportant file you might still
> > have an effective backup.
> 
> I can mount the DVD without any problems.  I created the DVD using
> dvd-slideshow and it worked perfectly.
> I can rip VOB's from the DVD using k3b or dvdrip; works in both
> programs. 
> So I can recreate the DVD but what bugs me that I can not make a backup
> to an ISO file using command line.

OK I see you have considered most of the possibilities i considered.

how about: 

mount /dev/dvd /mnt/dvd
mkisofs -o mydvd.iso /mnt/dvd  

(disclaimer, other options might be needed. is mkisofs even the right
program for dvd's? k3b is making me lazy)


> 
> -- 
> #Joseph
> -- 
> gentoo-user@gentoo.org mailing list

-- 
Nick Rout <nick@rout.co.nz>

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