Thanks, William!

I was wondering why like my maxtor, it is ata133 but it runs only at 5400rpm and my samsung it runs at 7200 and also ata133. I asked this inquiry coz I would like to upgrade my presario 7400 (built with only ata66) by adding add-on card. With ata133 pci controller card, will my pc also run at ata133 and 7200 rpm or not? Thanks.. Please help me.