Why are thery no 600Gb drives? The gaop bewtwwn 500 and 750 is too mauch and no copetetive choices. Por example is older days we had from 30Gb the progressin:
30, 40, 45, 60, 80, 100, 120, 160, 200, 250, 300 (320), 400, 500, now gap to 750Gb. In each case the difence was no moare than 1/3...