I need to replace my hard drive. The recommendation is: ATA/100 5400 RPM 9.5mm. I see a lot of faster drive 7200rpm but they are SATA. Is it true I can put this in also because they connector should be compatable. I just need to get 9.5mm or smaller and it would be fine? What is the different between ATA, SATA etc? Is it true that 100 is 100meg bits per second. So if I get 300, it is ok also.