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Mine started doing that, it meant the superdrive was broken.

Try different media, if that doesn't work, take it in to be fixed.
 
If other media works, then it's probably safe to assume that your drive just doesn't like the media you're using plain and simple?

Has it worked alright with that media before, or has this suddenly just started happening?
 
it always worked fine the only thing i can think of is I just did a clean install not to long ago
 
That shouldn't really be a reason for it to start happening...

I'm assuming you've done all the available updates? (i.e. everything that shows up in Software Update)

I can't think of much else, perhaps it's faulty. Ring apple and see what they say?
 
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