[Bug 540582] Re: Creating isos of some DVDs fails with "Data could not be written"

Cefn launchpad.net at cefn.com
Sat Apr 10 21:28:10 BST 2010


Turns out there was corruption in the DVD I was trying to backup. A
workaround for the corrupted DVD I was reading was to do the copying
from the command line with a different tool.

To install the tool run...

sudo apt-get install gddrescue

...or install gddrescue through a graphical package manager like
synaptic then use the following to copy the stream in a way which
abandons the corrupted sectors, rather than allowing them to junk the
copy. In the terminal unmount the drive and start the copy process like
this...

umount /dev/sr0
ddrescue -d -n -b 2048 /dev/sr0 /home/cefn/out.iso /home/cefn/out.log

...where /dev/sr0 should be replaced with the raw path to your DVD
device, and the other two paths are the disk image file and the log file
respectively.

I got the raw path /dev/sr0 of my DVD device by running...

mount -l

...after the DVD had first automounted. It reported the line; /dev/sr0
on /media/cdrom0 type udf (ro,nosuid,nodev,utf8,user=cefn). Note it's
the first path in this line about the cdrom drive which you should use.

Depending on your permissions you may need to prefix commands with the
word sudo to elevate your privileges so you can access devices directly.

I thought this was really weird since I could view the DVD in VLC fine,
but not copy it.

It seems that DVD players already know how to handle corrupted sectors,
but copy programs typically do not. Copies made of corrupted disks, even
if they appear to work as far as the menu, come out as junk when you try
to play the part of the video which is stored with corrupted sectors,
since the copy program produces a disk image with different kinds of
error than the corrupted original, and so the player can't use the same
tricks to skip over corrupted sectors.

Given the nature of this problem it would help if the error showed 'Data
could not be read' rather than 'Data could not be written' since I spent
a bunch of time checking my hard disks which were fine.

-- 
Creating isos of some DVDs fails with "Data could not be written"
https://bugs.launchpad.net/bugs/540582
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