Should I spend the extra $15 on a ‘Green’ hard drive for my Home Server?



Should I spend the extra money to get a ‘green drive’ for my Home Server?

So, the multimeter reported the following: 1.06A average consumption, 1.13A maximum consumption. The oscilloscope data reads: 1.04A average consumption and 2.71A maximum consumption. As you can see, the multimeter managed to get the average value pretty closely, but failed to catch any of the consumption peaks.

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12v * 1.07a = 12.84w * 24h * 365d = 112,478.4wy / 1000 = 112.4784kwy * $.0824 = $9.27

Note that our tests show only the overall power draw, not the individual power draw of components such as the hard drive. Western Digital claims that the Caviar GP drops its operational draw to 8 watts, down from the 13 watts consumed by a previous-generation model. The company also says the power-consumption savings can reach up to 38 percent over a previous-generation drive. We were not able to test these claims.

You can conserve a little power with the Western Digital Caviar GP, which costs less than the Seagate–proving that going green can save a bit of green too

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Cost savings:

Best case (mfgr statements): $9.27 * 38% = $3.52 / year

Tested case: $9.27 * 3.2% = $0.3 / year

No, it’s not worth the extra $15 (for me)

Did I get my math wrong anywhere?