How do I keep EHDs spinning?

I have a new Imac and use 2 G-Tech 0RAID EHDs. I have no complaints at all except that all my image data is now on one of these drives and they go to sleep very quickly. When they are awake, accessing and recording to them is very quick (my main drive is a 500Gb SSD) but as soon as they go to sleep they take about 10 seconds to wake up and this slows down my workflow.
Is there a safe and reliable solution to keep these discs spinning which works OK with Mavericks?  Heeeelp!
PS, It's amazing that Apple haven't updated this forum so that we can correctly post our OS, they are still stuck on Mountain Lion!

R C-R wrote:
macjack wrote:
"Put hard disks to sleep when possible" is only an option for your system disk. It has no control over other drives. All drives spin down after about 15 minutes of inactivity.
This is not true. The option applies to all drives; *however, many ignore the spin down command from the OS & spin down according to their own internal inactivity timers.* There is nothing you can do about this unless the drive's maker provides some way to defeat this proprietary feature.
Hi RC-R,
Isn't this essentially what I said... or should I have said *has little effect over other drives?*
BTW, *the default delay is 10 minutes of inactivity, not 15.*
I said *about 15 minutes,* so you really want to make me wrong over 5 min.?
Especially when saying...
If you have such a drive, the only way I know of to keep it spinning is to write some "do nothing" application that periodically fetches some file data from it, perhaps as an Applescript app. *This will require some experimentation to determine its internal timer value*
How about using ?
sudo pmset -a spindown 0
-mj

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