We use DDRescue on Windows installed with Cygwin to read a badly scratched DVD disc. We then use the Parity Volumes/erasure encoding to recover the data that would not read from the scratched area on the disc.
How to install Cygwin – https://youtu.be/_eLHllp1KEI
Quickpar Video – https://youtu.be/OzTrnqdTfkk