I just set up two drives for my dad, 500GB 7200.11's, and i'm worried about this now. The boot drive is making a damn clicking noise every now and then, and cache sizes are reported as "0kb" in Diskcheckup. Everest says "unknown".
I could't find the cache stat in SANDRA though anywhere on the HD report?
Model no: ST3500320AS. Firmware version is SD15. Arghhh!