Note that they don't actually say that they're doing anything special about it. Green drives are very low on noise and vibration already, and spin slowly enough that it's unlikely to be a concern.
From the review:
The drives also are engineered with "3D Active Balance technology" which tunes the drive to eliminate vibration leading to improved reliability and overall performance.
May be marketing speak, but they seem to be doing something that they tend to skip on other drives.
It was my understanding that vibration becomes more and more of a problem as data density increases, due to the smaller and smaller data tracks on the platter (Hence why larger drives tend to appear first at lower RPM rates, and slowly become available in 7.2k, 10k and 15k varieties). Not enough to ever be a problem with just one drive, but more of an issue when 12 of these are bolted into an enclosure barley bigger then the drives. Most of the drive mounts I've seen out there lack any kind of damper to minimize transferring the vibrations into the rest of the chassis.
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