IMac turn off the HDD that is constantly spinning

Hi All,
I have a 27' iMac with internal SDD and HDD. I really like how it is so quiet. It worked really well out of the box though had a glitch which required a reinstall of Lion. Now the HDD is constantly spinning even if there are no apps open that require r/w access to the HDD. I've used pmset to turn it off after 1 min but I'd rather it didn't come on at all unless i send something to/from the HDD. Any ideas how to configure this correctly?
Ta, H

Having the disk not mount at all can be done a number of ways depending on how much work you want to do in handling this task. There are two places/times where this can be done.
1. You could unmount it at login by placing a unmount app of some kind in your login items or a lunchd plist in your local ~/Library/LaunchAgent.
2. You can unmount it as the machine is booting by creating a launchd startup item in /Library/StartuItems or /Library/LaunchAgent.
So probably for you the easiest is to use your Login Items to launch an app or whatever to unmount the drive as you log in.
You will need some kind of unmount app that can run non-interactively. There are unmount apps you can find in macupdate.com but I don't know if they can be made to run non-interactively.
I don't know your level of experience but unmounting can easily be done from a (bash) shell script (diskutil unmount /Volumes/volname) encapsulated as an app with Platypus or just using the script commands with applescript.
Here's a related thread on this topic:
App/Script for Unmounting a Drive?
Also here's a google search on "how to unmount disk on mac". Look through the hits on suggestions.

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IMac turn off the HDD that is constantly spinning

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