Hey , So my MBP i7 with a 500GB 7200 rpm disk. The system has been freezing randomly for up to 20 - 35 seconds at a time, the same as many other people on here. i have used superduper to clone my disk to a usb hd. I have not had 1 single freeze so far running of the usb drive. I boot back to the internal drive and with in minutes i get a freeze. This is just what i have found, would be good if anyone else with the freeze issue could try the same. My hdd is Model Number: ST9500420ASG Revision : 0008APM2 serial : 5VJ5AN23 just wondering if all the people that have this issue have the same hard drive ??????