You can always tell when I am about to spend some money. I always jump on here and start shotgunning questions. Well, here comes another one. Now that I have my SSD issues sorted out, I am looking at spinning hard drives for use as bit buckets for my mac pro 3.1 I been looking pretty hard at the western digital stuff and succeeded an coming up with more questions than answers. Whats with all the colors? so far I have identified black, red, green and blue. Also, since the drive(s) will be used as bit buckets for my iTunes library, time machine back up and so forth, does the spindle speed difference between a 5400 and 7200 rpm's really mean anything.