Ok, looks like upgrading my G4 1.25 GHz PB is out

I've been reading everything I can find here and it looks like my PowerBook optical drive won't work with the Leopard DVD. The drive is a ComboDrive and is a Matsushita CD-RW CW-8123.
OTOH, I haven't seen anything about the SuperDrive in my G5 iMac (yet): Matsushita DVD-R UJ-845
I did notice that Matsushita drives have more reported failures than Pioneer drives, though that may be be because there are fewer Pioneer drives out there.

I strongly doubt that it's happening for even a major fraction of the people who have systems with this model of drive or, given now many have the model of drive, the large majority of people with PowerBooks would be unable to install Leopard, though of course it's early in the release of Leopard so we don't know how many people have tried. Whether nor you you'd have a problem I can't say with certainty, but I'd bet that all would go smoothly for you if your drive is having no problems reading DVDs now (if it can read the Tiger DVD, chances are high it would read the Leopard DVD as well). Up to you, though; unless there's something in Leopard that you badly need or want, there's little penalty in waiting (we may find that it's nothing more than just a run of badly-pressed disks).
I'm beginning to think that PPC machines (and possibly early Intel) should be left at Tiger, and only fairly recent Intel machines should use Leopard.
For what it's worth, I have or know of a number of older systems that have Leopard installed and that are working without problems, so I don't think it's related to older/newer systems per se.

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