slackbuilds_ponce/system/recoverdm

This program will help you recover disks with bad sectors. You can
recover files as well complete devices.

In case if finds sectors which simply cannot be recoverd, it writes an
empty sector to the outputfile and continues. If you're recovering a
CD or a DVD and the program cannot read the sector in "normal mode",
then the program will try to read the sector in "RAW mode" (without
error-checking etc.).

This toolkit also has a utility called 'mergebad': mergebad merges
multiple images into one. This can be usefull when you have, for
example, multiple CDs with the same data which are all damaged. In
such case, you can then first use recoverdm to retrieve the data from
the damaged CD's into image-files and then combine them into one image
with mergebad.