Using 'dd' to copy a dvd used to work and now doesn't - any idea why?
I had to replace my system after a disc crash. Previously (Ubuntu 12.04) I was able to run
dd if=/dev/sr0 of=xxx.iso
and I got a usable copy of the disc.
Now, (Xubuntu 12.10) the same command, on the same dvd, with the same hardware, fails with "Read of scrambled sector without authentication". I know this is a low level hardware message, and most of the responses I see on the we relate to viewing the dvd with a player. However, just to be sure, I have installed libdvdreader and libdvdcss. I can play the disc in question quite happily with vlc.
Oh, and it's not just the one disc, either. I mention a specific disc to as an example of one that worked before and now does not. Other discs also fail.
Any thoughts? What did I install on the old system that I have forgotten about? What other difference might there be?
I had to replace my system after a disc crash. Previously (Ubuntu 12.04) I was able to run
dd if=/dev/sr0 of=xxx.iso
and I got a usable copy of the disc.
Now, (Xubuntu 12.10) the same command, on the same dvd, with the same hardware, fails with "Read of scrambled sector without authentication". I know this is a low level hardware message, and most of the responses I see on the we relate to viewing the dvd with a player. However, just to be sure, I have installed libdvdreader and libdvdcss. I can play the disc in question quite happily with vlc.
Oh, and it's not just the one disc, either. I mention a specific disc to as an example of one that worked before and now does not. Other discs also fail.
Any thoughts? What did I install on the old system that I have forgotten about? What other difference might there be?
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