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This is not as straight forward as it sounds.
Specs from Western Digital's site for a WD 3TB Green Drive:
- Read/Write 6.00 Watts
- Idle 5.50 Watts
Looks fine right? Look at this part of the spec: "12 VDC" and "Read/Write 1.78 A".
It was a long time ago, but when I was in college that would mean the drive uses 21.36 Watts (12V x 1.78A). 21.36 Watts is a lot more than the claimed 6.00 Watts.
I want to put four of these in a RAID 10 array, so I want to know the actual max power requirement.
Thoughts? Is this a simple typo? Do I need to plan on ~85 Watts of power to support four drives?
Ohm's Law: E (voltage) x I (current) = P (wattage), however I and P are generally not consistent in electronics in terms of energy consumed, i.e. P will usually fluctuate because I fluctuates based upon current demand at any given time. – JW0914 – 2019-11-18T12:51:12.653
That "spec sheet" is a joke and incomplete. There's no mention of current draw for the +5 volt supply. I remember when 5.25" HDDs had full product manuals with graphs for all operations for both voltages. – sawdust – 2013-03-14T08:41:53.183