So I'm building a new PC from scratch. This guy here at work did the following. He got a 74GB WD Raptor 10000 RPM hard drive, where he installs his OS and apps, and got another, higher capacity 7200RPM drive for his data (music, movies). He swears it's screaming fast and insists I should do that. Now I looked at some prices, and 200$CAN for a 74GB just sounds wrong to me. Will I really see that much of a performance increase? Will it be enough to justify the bill?