Power Management: Standby/Sleep Mode (typical): 0.5 W
How does this compares to other models?
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You can usually find spec sheets on manufacturer sites, e.g. http://wdc.com/en/products/products.aspx?id=810
(go to Specifications tab, select model #). Do note that as models change, so do the specs, and they may not match older models anymore. The model version may also change without the model's number or name changing. Example: WD6400AAKS-22A7B0
. The bold bit may change without the first part changing, and the model name or number is usually just that first part.
~0.5 W seems pretty typical across ranges, WD lists the current 4 TB Red (and Green) as using 0.4 W in Standby/Sleep.
PS. If you want to track down figures for older models, try in older reviews. Storagereview.com
is an old staple when it comes to HDDs (and now SSDs and NAS'); they will at least list the specs given at the time if they haven't tested the drive's power consumption themselves.