WD My Book HDD WD Black editon?

What's the part number printed on the case? They are usually Greens but I had a 4TB My Cloud a couple of weeks ago that used a WD40EFRX-68WT0N0 with a black label. Strangely, if you use the part number on this HP site, it says it's a Red, so I don't know how much faith I would put in that site to tell you.
 
How do the greens compare to the black?

They are slower and spin down to save power after a timeout period. Whenever you need to retrieve a file from the thing, it has to spin up again to be available - it adds a 5-second delay in opening a a file, I'd say. I put one of them in a computer as extra storage, and frankly, I regret it. Every time I need something I have to wait for it to wake up.
 
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