Exam Problem: Rounds per minute into Megabits per second

[Ramses The Pharaoh]

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 dependence 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

 

[WhirlwindMonk]

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.

 

[Ramses The Pharaoh]

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]

No, that's not what he said. he said you need to know how many bits can be read in one revolution. I presume that by "rounds per minute" you mean "revolutions per minute". Multiply that by "bytes read per revolution".

 

[Ramses The Pharaoh]

Hehe... nice point of view! :rofl:
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
Thanks for your answers :shy: