Thanks but I was hoping for HDD recommendations, not places to buy.

Anyways, www.newegg.com does not have ATA-5 2.5" x 9.5mm 4200 RPM HDDs.
And, I don't think my system supports ATA-6.

Also, I think my system supports up to 20 GB HDDs.

Which is better? Fujitsu vs. Hitachi


Fujitsu but those other things you're worried about won't matter. Have
upgraded a dozen notebooks from 4GB to 60GB with no/little trouble.