HD won't spin down in combo SSD + HD 2007 MBP

I installed an SSD in my optical drive bay in a late 2007 MBP hoping to improve performance, reduce the noise of the HD spinning and increase battery life with virtually no HD activity.
I set the system to boot from the SSD but the HD is always still annoyingly spinning. Set option to have HD spin no when no activity, of which there should be none (that I am aware of).
Any ideas on why this might be happening?

I'm confused now, Martin. Your original post said that this was an "iMac DV+ "450" ruby red"
All of the 450's (they came in Ruby, Sage and Indigo ) had a DV drive fitted as standard. As you say, the 400's didn't.
Can you spin the drive down manually, using the sleep command under the Apple menu?
The slave issue could be involved, but, as I said, this was a very common problem with the Summer 2000's anyway. (I suffered it myself)
David, I must have dealt with hundreds of queries about exactly this issue with the Summer 2000 iMacs here over the years (though I don't look in here as often as I used to). I promise you, at least with the drives originally fitted, the very common problem of spin down failure of the drives in this model was directly asociated with increased bearing whine and wear over time. The hard drives factually fitted to these machines were generally a "LC" (low cost) model, with a reduced warrantee period.
Of course, as you say, if a new drive is fitted this may not be as big an issue.
Cheers
Rod

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