Some DVDs aren't recognized in the drive

I have a Mac Pro tower, as well as a MacBook Pro.
Sometimes when I try to use a DVD (custom-made, not a manufactured item) in the Mac Pro, I get a message that the computer does cannot read the disk. This does not happen with all "home made" DVDs - I recently got 5 DVDs with QuickTime files on them, 3 were rejected, but 2 worked fine.
Yet, I take the same rejected DVD and put it into my MacBook Pro, and it works fine.
Any thoughts on this?

Maybe it's the media itself rather than anything you're doing of your hardware. Try using good quality branded media and see if things improve.

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