Installing SP2 over an existing SP1 or earlier version (windowsupdate site or separate CD) will almost always cause someone problems, somewhere.
The big secret is to get your hands on an XP cd with SP2 already integrated.
Did you by chance do a reinstallation of windows lately? You need SP2 installed to support USB2.0 ports. Otherwise, they will just be regular USB1.1. Or you could install the Notebook System Software (NSS).
Not many out there have an XP install cd with SP2 already integrated. Most people use the windowsupdate site or use a separate SP2 update cd. NSS simply enables SP2-related features to work on the laptops (USB2.0, SD slot, etc) even if...
The 7200rpm drives have been going out of stock everywhere online. Many sites even raised their prices. Either there was a huge demand surge the past few months, or Hitachi is clearing out inventory for a new 7200rpm model sooon.