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good tool to recover scratched CD's/DVD's?

I'm currently using dd_rescue to attempt to recover as much as I can from
some scratched DVD's. Thankfully, everything is burned with SHA1 sums, so
i'll know exactly what i managed to recover and what is definately lost.

dd_rescue works okay, but is there something that tries "harder" to recover
a dvd/cd?

  - seeks back to failed blocks and retries them later?

  - tries reading random ranges of a cd/dvd instead of reading the whole
    thing in sequence?

  - ejects and re-loads a cd/dvd if it seems "stuck" reading back blocks?

  - etc...

Is there a tool available that does stuff like that?


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