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I have a video DVD that I'm trying to extract but that is very hard to read (takes several days and not finished).

Is there any way to find out if the problem is a physical damage of the surface of the optical disc, or some corruption in the file system?

I'm asking because the disc has no visible physical damages, and I want to take proper action in the continued tries to extract it data. E g need to know if a polishing of the surface of the disc might help.

PetaspeedBeaver
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    Does dmesg contain any related messages? You could try dumping it as an ISO file with `dd if=/dev/dvd of=disk.iso`, this reads the disk's raw data, so if the problems persists, it should be with the disk or the drive. – crater2150 Dec 20 '16 at 11:50
  • Have you tried copying it with `dvdisaster` first? – Andrea Lazzarotto Dec 24 '16 at 17:07
  • @crater2150 `if=/dev/dvd of=disk.iso` is indeed very slow, and gets stuck, so I guess that means that the drive has a hard time to read time DVD. – PetaspeedBeaver Dec 27 '16 at 11:38

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