Over the past few days we've been covering issues with various Macs (both desktop and laptop models) not being able to read DVDs. Some readers have reported issues playing commercial movie DVDs, whereas others are Macs are unable to read "burned" DVDs. In all cases, the same DVDs have been playable on home DVD players, or even on other Macs or Windows computers. Gary Squires' email is representative of the issues related to burned DVDs:
"I've run into this issue with my G4 500 MHz AGP Mac. I have some DVDs that were created on a Mac using Apple DVD-R media and they won't play on the internal MATSHITA PD-2 LF-D110 drive. They play fine on my DVD player or on other computers with DVD drives. Have never quite figured it out. The drive does play all commercial DVDs that I have put into it."
John Buono is experiencing the problem with commercial movies, and suspects copy protection issues:
"I have recently experienced a similar problem... I have a G4 Tower, and found that some commercial DVD will not mount, but yet on my PowerBook, it mounts fine. I am beginning to suspect it is the rumored new copy protection that will not let a DVD mount on a RW device."
Finally, Michael Sumin notest that this issue has been reported on Apple's Discussions forums for some time:
"I and others have been having this problem for several months now on our iBook Dual USB's. Just read the the Apple discussion forum to see all of the complaints. We still don't have an answer from Apple.
Audio decoding problems Reader Mark Jeffrey notes another issue reading DVDs, this one relating to decoding the audio tracks:
"There's even a bigger problem with the SuperDrives, which I noticed on my G4. If you play DVD's, especially concert video's, you will notice that it can't handle the Dolby encoding, and therefore creates a sound that appears like someone is messing with the volume switch. At moments of peak information in the music, the whole thing drops down several db, creating a pretty bad listening experience. I've talked to Apple about this, and they say it's a problem with how the Dolby decode works."