A little tip for those of you who might have installed Seagate SATA drives into your 3GB/s capable G5, MacPro, NAS device, or whatever.
Looks like recent Seagate drives ship with a jumper installed that limits the drive to 1.5GB/s speeds. While the jumper is documented in the User's Guide that ships with retail packs, it's specifically mentioned as something you might need to install if you have trouble with the drive. And OEM drives don't have any documentation at all.
To get 3GB/s, the jumper should not be present on the outer pins of the jumper block. So -- if you've got one of these drives, check it out: you might get that drive humming along twice as fast!