hi, i upgraded my uMBP 5,3 HDD to WD 640GB 5400 rpm from the stock 320GB however the performance is not satisfying for me it doesnt make noises or click , and it runs cool, battery life also quite good. the only problem is that my system runs noticably slower compared to the stock HDD. i did freash install SNow leopard twice using the free upgrade dvd that come with my machine, but still the performance is not as good as i would have imagine. anyway im thinking to upgrade my HDD to 1TB and i found on the net that there is 2 brand for it. toshiba with 5400 rpm and WD with 5200 rpm can anyone give me reccomendation on which drive is bettter ? i supposed looking at the spec , the toshiba should be faster because of the faster rpm speed ?