Manually spin down hard drive

Is there a way in Mavericks to manually spin down a hard drive? I run my system, applications and store most of my data on a large SSD, but I have a 1TB HDD in the opitcal bay of my MacBook Pro.  The HDD is not needed much, but it does spin at times more than needed.  From an energy savings standpoint, I was wondering if there is a way in Mavericks or a widget to manually spin the drive down?  Thanks!

Sorry, I meant to say the traditional platter 1TB HDD is in the standard Hard drive bay.  I have the SSD in the optical bay.

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