MBP read commercial disks but not its own

My Mac Book Pro will read commercial disks (DVDs) like movies, books on CD, etc. And it can write disks (DVDs). But lately it cannot read the disks it writes. I tried the disk the MBP wrote on another computer and it read just fine. So I am confused. Why can  it read and write DVDs but not the ones that it writes?
Any ideas

Only idea is that your SuperDrive just may not be that "super" any longer. Take the machine to an Apple Store or an AASP and have them run diagnostics on the optical drive. Be sure and take some of the DVDs that you've been able to write but cannot read.
Good luck,
Clinton

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