Comment by account42

> maybe my drive is more sensitive to defects than my player is, or there's some stupid copy protection scheme

FYI for UHD disks in particular common ripping software does not include "player" keys (because they are hard to come by and would be blocked by future releases) but only the disc-specific decryption keys. This means that new releases can't be ripped until someone submits a dump of the copy protection data, which can sometimes take a while if you don't do it yourself.