Setting specific disksleep times

hi all,

longtime reader, first time macrumors poster.

have mac pro multiple hdds holding sorts of different goodies. manually set hard drives spin down more others. there way can make work?

understand pmset command , might key making work simple "sudo pmset -a disksleep 20" would, assume, hold disks spinning 20 minutes. there's 2 disks i'd have sleep immediately, , 2 (including mac hd) i'd have spinning around 20 minutes before sleeping after inactivity.

suggestions? all!

 

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