IMac 27 internal HDD possible to eject permanently (after additional SSD upgrade)?

hello everybody,
would like to expand my imac (mid 2010) with a second SSD hard drive,
and would like to use primary HDD just for some special reasons and not all the time,
it would be very annoying, if the HDD runs/awakes/stops all the time because of spotlight, istatmenu or some system integrated processes ..
i guess, disk utility will not unmount permanently and energy saving option for harddrives will either not help,
does anybody know, if is possible to eject the HDD permanently, so if i can decide to mount it when i need it?
thx in advance

i think this should help, gonna try, sorr' for not finding at once .)
https://discussions.apple.com/message/17652585#17652585

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