Since an incremental update to Mountain Lion (now 10.8.5) neither my internal SuperDrive, OR my external LaCie DVD burner/player will show a mounted DVD disk icon on the desktop. Never had any problems burning or reading DVD's up to this point.
Immediately after inserting a disk (in either drive) will cause a dialog box with: "The disk you inserted was not readable by this computer. IGNORE / EJECT" to appear. This happens with a blank DVD, burned on this computer DVD or a commercial movie DVD. CD's will read and play.
I have: repaired permissions, cleaned all my caches, reset my PRAM and SMC, trashed the Finder preferences, restarted in Safe mode. Only difference was when in Safe mode, Disk Utility ID'd a commercial movie DVD with it's correct title and UDF format, instead of showing it as a MS-DOS(FAT 16) in the Format heading.
After I clicked the Repair Disk button in Disk Utility, it showed the error code:
"Invalid BS_impBoot in boot block : 66671c". This same code comes up in Disk Utility for every DVD I try to mount. Only difference is that the bad boot block number is different for each disk.
Apple's online discussions show this problem has happened to several hundred people… with iMacs and PowerBooks. No replies from Apple. This goes back to 2011.
Anyone have some insight into this? Apple may feel that optical readers/burners are obsolete in their new iMacs and PowerBooks, BUT I still need to be able to at least read my own DVD archives.
Thanks in Advance,
C.C.