Not scratching,  but a lovely chainsaw noise?

Not Scratching, but a lovely chainsaw noise?
It's not happening on every disc I put in, but maybe 4/5 discs will have a lot of grinding noise when I play them and it's worse when I try to import them.
Even more annoying is when I try to burn a disc and half the time the chainsaw noise starts and the operation has to be cancelled.
What is happening to my pretty macbook???
m
MacBook   Mac OS X (10.4.6)  

Chainsaw/Helicopter/Jet Engine is usually a balance issue.
You could be putting in a bunch of media that is warped (heat, improper storage, etc). You might have labels on the media (bad idea). You might have received a bad batch of media that you are trying to burn unsuccesfully.
A 4 out of 5 failure with original video DVD's would be unacceptable to me. I would consider trying to burn with some different media, but if you get this with most of your disks then I'm guessing there's an alignment problem w/ your drive. I would contact Apple if it continues and return or service the machine.
Good Luck,
-j

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