I recently RMA'd a 20 GB 60GXP to Hitachi, it took about 3 weeks to get a replacement. I also checked for the update on
IBM's website, the initial check indicated that the drive needed the update. But when I downloaded the fix, the installer
told me no fix was required. I checked the file version, and the fix was older than the Rev. that was installed on the RMA'd drive.
Apparently Hitachi is upgrading the firmware when the send repaired drives, which makes sense.