On Sat, 27 Jan 2018 17:27:33 -0600 "Martin McCormick" <marti...@suddenlink.net> wrote:
> deloptes <delop...@gmail.com> writes: > > IMO read error means CD is bad, dirty scratched whatever > > > > regards > > Thank you but I think it is confused as the disk is brand new, > part of a set and all of them spew errors when placed in a drive. > They also play flawlessly in a DVD player which is one of those > multimedia types that will play anything from ISO9660 CD's to > DVD's. > > I think there is a deliberate protocol violation in the > control data that is there to discourage copying as there are > just too many brand new disks (6 all together) for them all to be > duds. I do agree that damaged disks do normally throw these > errors but it also looks like one is not supposed to mount them > as file systems. In that way, they are exactly like iso9660 > disks. > > Martin > DVDs -both, video and audio- have been well known to contain deliberately botched track indices, or in case of UDF, directory entries as some sort of copy protection. Usually these indices, written additionally to the valid ones are too complex to be understood by "dumb" standalone-players and therefore ignored by them. When read by computers, however, they appeared mostly unreadable. My money's on some willful violation of the UDF standard, maybe somewhat more sophisticated as the previous scheme. VLC, btw used to be quite good reading these disks, sometimes also lsdvd used to provide at least some info about their content. Cheers, Tom -- "I hate these filthy Neutrals, Kif. With enemies you know where they stand but with Neutrals, who knows? It sickens me." -- Zapp Brannigan
