I just bought an iMac 27" 4 cores, the one with the Intel i5. Sadly, this computer feels like my first iMac in terms of speed - it is sluggish and the reason for this is that the hard drive is being thrashed excessively. By using iStat Menus, I can clearly see that the disk is being constantly read, constantly at 3 MB/s, which is insane since I am not copying anything: I thought the culprit was Spotlight, so I turned off indexing on my main HD and the problem still persists. I cannot find one utility out there that will let me know what process is beating the crap out of my hard drive. Is there such thing for OS X? Something like Windows 7 resource monitor is exactly what I am looking for. Thanks!