avoid intentional bad blocks

[Benjamin Drung]

Report from Don Mahurin:

I modified dvdbackup to avoid unused blocks according to pgc traversal.

For the source of the change and for details see:

http://dvdbackupx.openright.org/

It uses libdvdvm from libdvdnav. While libdvdvm is not exactly prepared to function as a stand alone library, it is sufficient for most cases.

I don't know the specific details of ARccOS, but this modification can avoid such intentional bad sectors.

By default, the behavior does not change.

Using '-r u' will calculate and skip unused blocks.

[vandyswa (ajv-cauriumbin)]

I've tried this version with a DVD which appears to have these sorts of blocks.
The copy in its entirety failed... let me know if more details are of interest.

Andy

[Preston Crow (pc-ubuntu15)]

I'm hitting this problem more and more often now. I also tried dvdbackupx, and it didn't work for me, but the idea sounds like the right approach.