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I have a friend who has a SuperDrive that is very slow when reading DVD and coping from a DVD on a Mid 2010 Mac Pro.

This is NOT A SUPERDRIVE FAILURE issue. The is another thread complaining of this issue.

but a nagging, and painfully slow performance problem

SuperDrive are supposed to read at 8x speed for CD-R
and are supposed to read at 18x speed for DVD-R

I have an MacBook Pro with OS X, 10.6.6
and my superdrive works fine

I believe the problem is not an OS issue
but with a specific set of models of superdrives being used on new Mac Pro models

I am trying to get confirmation from Apple on this issue