Assembled desktop computer's hard disk option should pay attention to?

Users questions: My computer now and 160G hard drive, the aging of the general feeling seems a bit of a tendency ... to replace the hard drive, but do not know how to choose the computer's hard drive, which represents what the specific parameters of the true meaning of there is not understand the performance of hard disk high or low, will affect what is inside the computer running?
Experts answer: sata2 interface now select the hard disk of course, large cache well, but expensive, the best single disc of choice. 7200 rpm desktop drives. Western Digital 808GBSATA32MB (Green Edition) 460
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