Optical drive does t recognize disk

I have a 2009 MBP running Lion 10.7 .  The optical drive recognizes some disks CD and DVD but always shows that they are blank .

Hi Roger,
You could purchase a CD/DVD drive cleaning kit, or you can try with materials you may already have on hand. Use a credit card, or something similar, and wrap it with an LCD cleaning cloth type product (basically a thin micro-fiber type cloth). Gently slide the "cleaner" in and out a few times in the left side of the optical drive opening. Make sure you can hold onto the cloth so it doesn't get stuck inside the drive. This cleans the lens, which may be all you need.
The drives Apple uses are notoriously picky about which brand of disc they'll read/write, so try some different brands and see if they work.

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