WD RE4 spin down?

My RE4 WDC WD2003FYYS-02W0B1 doesn’t seem to spin down.

I have it installed in my WHS2011 rig as a Backup HDD, and previous disk did indeed spin down.

Does this disk support APM?

btw, Merry Christmas!

Hi, don’t see APM as part of the specifications. 

http://wdc.com/wdproducts/library/SpecSheet/ENG/2879-701338.pdf

Did some checking and found that not one of my HDDs are spinning down, so maybe it is something else, I will start there first. But as you wrote can’t find that RE4 support APM