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My exam comes in one week, so I need your urgent help

I found out, that one of the problems in the exam will be about convertion between rounds per minute (of a CD or HDD) and megabits per second (as reading speed). I have no idea what is the dependance between those two measures. Does anyone of you know a formula for convertion or have any clues how to derive such a formula.... Help?!

Greatly appreciate your concern