There is a bunch of movement on the CD and there is spects of dust on it too which I think is going to affect your score. I also think that the title is too specific.
Good concept. I think it might be a tad stronger if the cd was the part in focus. It would help magnify the enormous difference between the two storage methods.
Good concept, although the position of the in-focus field could have been worked better. For example, having the bottom of the disk stack in focus with the top out of focus would imply an immeasurably tall stack. Reversing this arrangement and having the bottom of the stack fade to blur would seem like a row of disks that recedes over the horizon. Just a couple of suggestions.