Update: The spindle speed of the 2TB Caviar Green does not vary between 7,200 and 5,400 RPM to save power, but rather fluctuates close to the latter figure, or so Western Digital claims after refusing to give an exact spec on the new drive.

It might be the case that RPM is actually fixed at 5,400 as making it variable would be too complex to design with almost no benefit to power consumption. But again, WD is not disclosing exact rotational speeds, perhaps fearing that this fact would curb sales.

Western Digital has finally announced their .