You might try a lens cleaner disk. These are generally available at most
stores that sell CD/DVD media for a few dollars, and they clean any dust and
debris that is on the lens. This is a frequent cause of read failures in
optical media.
It's also possible that the drive is bad. Here is what a poster said just
yesterday:
" I have had two Lite-On SH-16A7S drives, and I have returned them both
to the retailer. With both of them I found a significant number of my DVD
movies were not recognised at all when inserted into the drive. [The discs
are perfectly fine, and are recognised immediately by my 10-year-old Hitachi
drive that has never had a lens cleaner through it since it was new]. The
Lite-On website has no downloadable firmware for this model (or didn't at
the time I returned the first one) and their technical support suggested it
was a drive fault and that I should return it. Either it is a fault with a
batch that the retailer received, or it is a problem with the design of the
whole model."
I just copied and pasted that. Don't forget to consider that possibility.
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