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“Because helium has just one-seventh the density of air, using it reduces the turbulence caused by spinning disks and the heads that constantly move above them to read and write data. That, in turn, means lower power consumption and less waste heat in the data centers where these drives are designed to be used. Specifically, WD said the power used per terabyte drops 49 percent.
The lower turbulence also increases the drive's capacity because more platters can be squeezed into the 3.5-inch housing. Today's 4-terabyte models use five platters and top out at 4TB, but the Ultrastar He6 has seven platters and reaches 6TB of capacity. That's also useful for data centers where space is at a premium.” - Steven Shankland, CNET