Apple released this utility today for the MacPro and iMac Core 2 Due running OS 10.4.7 and higher.

There's already comments on some sites about how 'weird' it is that some people are getting 'not needed' result. Not a big surprise since it's probably designed only for specific HDs. Curious me went digging in the package to verify -- and I don't own either of those Macs.

Check the package contents:

Google showed the following the first part of those folders:

ST3500641AS - Seagate Barracuda 7200.9 SATA 500-GB

ST3750640AS - Seagate Barracuda 7200.10 SATA 3.0Gb/s 750-GB