Well I got back my old Hitachi 160 GB HDD as a replacement. When inserting I noticed a huge difference in thickness compared with my new Seagate 500GB SATA. The Hitachi's thickness is double of the Seagate's. Both are of 7200 rpm's. May I know why there is a big difference in thickness?
Attaching a pic.
^^ shouldn't be difference in performance. main difference are: eats more power (slightly more), makes more noise & gets warm (the one with more platter). non of them will cause any problem but a small drawback.