I just bought a Western Digital 20GB 7200rpm hard drive for a P133 system cuz the old hard drive died a cruel death on Friday. That old hard drive was mounted vertically in the front of the case, where there are some air holes that i guess allow it to dissipate some heat. Should i mount the new hard drive vertically in the same position as the last one or horizontally in one of the drive bays in my mid-tower? Do "verticalness" and gravity have bad effects on a hard drive? Could they have caused my old hard drive to last only 4 years? Thanks a lot in advance.