Need to put a much bigger drive in my laptop. Currently have a 320GB but most of the time need another external with 320GB connected to it. So what are the best value and performance drives for a laptop at the moment. Its an old Dell 9400 so it needs a 2.5" 9.5 mm SATA drive. Something that runs cool would be best as these laptops can get hot. Want to get something similar for another laptop I have a M1330.