Hi Sorry to jump in like this but really after some advice. So thanks in advance. Id like to upgrade storage on my iMac - currently 640Gb Hitachi SATA 7200. Ive seen the instructions, but a little confused on which drive to buy. Id like to go up to 2Tb - could anyone advise on best option - hitachi, seagate, western digital, samsung. And also will 7200 rpm be OK for heat? Full iMac details below - details below. Model Name: iMac Model Identifier: iMac9,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.66 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 4 GB Bus Speed: 1.07 GHz Boot ROM Version: IM91.008D.B08 SMC Version (system): 1.45f0 Thanks so much for help.