Im in the process of ripping my old dvd collection, but some of them are a bit scratched up. I was successful in ripping some of the worse offenders using ddrescue where makemkv would fail (even with 50 retrys set). But unlike makemkv, ddrescue cant really rip any dvds which have intentionally bad sectors as part of their copy protection, since it gets hung up on trying to read these bad sectors, making the ripping process take days instead of hours.
I tried some things to get around this, with known good dvds that have intentionally bad sectors, but was unsuccessful. How does makemkv know to ignore these bad sectors?