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Well, I bought a new Blu-ray drive, and it can read the Cosmos discs, so I guess my trusty Plextor drive must move onto greener pastures.

I don't know. Of the dozens of Blu-rays I've tried, Cosmos is the only one that doesn't work.

I think the PX-B310U supports dual-layer Blu-ray. The manual says:

For BDs, the PX-B310U and PX-B310SA:
• Reads BD-ROM, BD-R, BD-RE, and BD-R DL media at up to 6X speed

Well, I figured that much. I was just wondering if there's some fancy new Blu-ray technology that would cause the disc to be unreadable on some Blu-ray drives. If so, then this would justify buying a new drive.

I have a Plextor PX-B310U that has never failed me. However, when I insert any of the Cosmos: A Spacetime Odyssey Blu-ray discs, the discs are not recognized. All other Blu-rays that I've tried are seen just fine, and the Cosmos discs also work on my Samsung Blu-ray player. So there is something wro...