How does makemkv identify and get around intentionally bad sectors as part of copy protection on dvds

[Lucyy]

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?

[Ezatoka]

I can confirm, that MakeMKV has no problems with RipGuard or ARccOS. I myself had many DVDs (on BluRays there is no such copy protection) with that and MakeMKV read them without problems.

As much as I know, e.g. RipGuard has a certain string in the first sectors of the discs sectors, thus MakeMKV knows, how it should proceed.