Secondary internal drive in MacBook Pro won't spin down

[AmbientChaos]

I replaced my MacBook Pro's internal drive with an SSD and used the OWC Data Doubler to put a 750GB WD Black where the optical bay used to be.

I've noticed, however, that the WD Black won't spin down. Even leaving my Mac idle for a long time I can feel it rotating. In Energy Saver "Put hard disks to sleep when possible is checked".

I'm at a loss at what to do here. Thoughts?

 

[maflynn]

I believe any hard drive in the optical drive bay won't go to sleep.

 

[S.B.G]

I think some HDD's can't make use of the command to spin down as others can.

 

[AmbientChaos]

Thanks all for chiming in.

For anyone that's still interested, I timed the spin down time and while it did spin down after 15 minutes (which seemingly ignores the Mavericks default of 10) The drive still does spin down so luckily I avoided having to run scripts to mount and unmount the drive.

However the fact that it was a 7200 RPM drive meant noticeably higher vibration as well as increased temperatures which I thought were both detrimental to my Mac's longevity.

So I've taken to putting the factory drive back in. It spins down as it did before (didn't time), but I can neither hear nor feel it spinning which is good. The 7200 goes in an enclosure now.