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# bsimpson/gist:8085774 Last active Jan 1, 2016

Helium filled HDD Cost Savings
 Cost per kWh: http://www.electricchoice.com/electricity-prices-by-state.php GA \$12.17 MA \$15.86 Kilowatt = 1000 Watts Watt = The unit, defined as one joule per second, measures the rate of energy conversion or transfer. Press release on energy savings: http://www.hgst.com/press-room/press-releases/hgst-ships-6TB-Ultrastar-HE6-helium-filled "- 23 percent lower idle power per drive - 49 percent better watts-per-TB - See more at: http://www.hgst.com/press-room/pres-releases/hgst-ships-6TB-Ultrastar-HE6-helium-filled#sthash.EGMJomwt.dpuf" Power requirements of HDD: 6.5 to 9 W http://www.buildcomputers.net/power-consumption-of-pc-components.html max kWh = 43829.1 (hours in 5 years) x 9 (Watts) / 1000 = 394.4619 394.4619 x 12.17 (Cents / kWh) = 4800.601323 \$48 in GA over the lifespan of the drive assuming maximum throughput for 5 continuous years (worse case scenario) \$62.56 in MA 51% less energy usage: \$24.48 in GA \$31.90 in MA -- Dimensions of a 3.5" HDD: 4 in × 1 in × 5.75 in (101.6 mm × 25.4 mm × 146 mm) = 376.77344 cm³ = 0.013278 ft³ Density of Helium: 0.0001785 g/cm3 http://wiki.answers.com/Q/What_is_the_density_of_helium?#slide=2 Cost of Helium: \$3 / ft³ http://www.phys.ufl.edu/~cryogenics/hecost.htm 0.013278 ft³ x \$3 Cost to fill a HDD with Helium: \$0.039 (minus negative space for components) -- Conclusion: It will cost manufacturers \$.03 cents per HDD to fill the volume with Helium. The maximum savings on energy of the HDD under full load for the lifespan of the drive will be about \$24 in Georgia, \$31 in Massachusetts. The savings to the consumer will be determined by the markup of a Helium filled drive.