# Exam Problem: Rounds per minute into Megabits per second

Hi, guys! 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 Related Introductory Physics Homework Help News on Phys.org
You would need to find out how many megabits can be read in one revolution. Then it should be pretty easy, but without that information, I have a feeling this problem is impossible.

OK, if the question asks about how many megabits are read in one revolution, you say that "it should be pretty easy". Still, it is very foggy for me :-). Perhaps you could provide a small tip? ;)

HallsofIvy
However, this, being an exam problem, is assumed to be a little bit more complicated than simple arithmetics. I think it is enough to know the radius, the angular velocity (or frequency) and the time to read one bit (or distance b/n bits)... Once having these variables, how should I combine the megabits and the revolutions?! This is my problem