Slow Hard Drive

Hi

I have Vista Ultimate, my PC is a Dual Core Pentium Extreme 3.2 Gig with
4Gig RAM.

I have two SATA Hard Drives, both Western Digital, my C: Drive is a
10,000RPM the second drive is 7,200RPM,
both are about 40% full.

When I run HD Tack I get much better performance from the 7,200 drive, about
75 Mb/s than from the 10,000 drive, 55Mb/s,I have run tests on the drives
and both are testing as okay, no errors or issues.

I am looking for ideas on how to get better performance from the 10,000RPM
drive.

Any help will be appreciated.

regrads

Daniel