Seagate 7200.11 drives have a bug in the factory provided firmware that disables part of the drive cache. A firmware update has been created that will solve the issue. Drives with firmware version SD04 or SD14 in sizes of 500Gb, 750Gb, and 1Tb are affected.
There has been much talk of this on the computer performance forums. Since this drive is popular for Tivo upgrades I thought I should post it here. Theoretically increasing the drive cache could reduce disk activity which should decrease noise.
You can check your firmware version with Seatools
Read the official announcement here
Then download the firmware
The firmware zip file contains a bootable ISO and a floppy disk creator. I successfully upgraded my firmware using the bootable dos disk