what operating system? What are you trying to accomplish? Is this a recovery disk you are trying to use to reload the system?
That kind of error usually indicates either a media error or a hardware fault.
If a media fault, get a new copy. If it is a restore disk the computer manufacturer should be able to replace it. You might also try copying it on someone elses machine that has a CR/W. If it succeeds and you get an error on the reproduced media, it might be time for a new CD drive.
My hunch is that "drive N" is my CD, and that there is a scratch or mar that wont allow transmission of data from part of it.
Is that what "drive N" is?
If it _is_ a scratch, whats the best way to remedy it in your opinion?
If that isnt the problem, what is?

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