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. 


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