Well, it's a sad state of affairs but it's true that some DVD players find certain brands of recordable DVD incompatible.

It is happening less and less but it's still a problem.

We went through this with both floppy disks and recordable CDs. Yep, in the early eighties, writing to a floppy disk on one PC was no guarantee you could read it on another!!!. Compatibility issues are still being ironed out for DVDs.

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I'm not young enough to know everything!