This is mostly true, but is technically incorrect because some energy is lost to magnetic and gravitational forces. Some commenters have mentioned that all energy is lost to heat. In fact I would guess that WD has used the term "power dissipation" incorrectly (as others have already suggested) and should have instead used "average power consumption", but that is just a guess. The answer does not claim that WD specs are correct or that they make sense. This answer makes exactly two claims:ΔΆ.) The OP didn't understand the term "power dissipation". I encourage commenters to read exactly what this answer says and don't read anything else into it. Power Dissipation <- Energy measured in watts lost as heat Your calculation is correct, but your understanding of the term power dissipation is lacking :) Electrical Specifications
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