I have a mini box (laptop based hardware) with windows 10 x64 installed on msata based SSD. Power plan set to Never Sleep. I have a SATA 2.5' HDD for backup purpose.

The HDD just keeps spinning even set offline in Partition Management.

I suspect it's hardware related or caused by SSD-HDD mix. Is there a way to prevent the HDD from spinning when idle?

Edit: HDD connected through internal SATA3 port. I've waited day long and HDD spin down won't happen. Haven't tried on other systems yet.

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    Possible duplicate of How to keep harddrive spinning / prevent spindown?. While the author of the duplicate question is using Windows 8.1 the answer to the question still applies to Windows 10. – Ramhound Nov 19 '15 at 13:26
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    That question asks how to prevent spindown, while this question seeks solutions to activate spindown. The answer to one won't necessarily (unless you're quite computer literate and willing to muck around) help with the other. – a CVn Nov 19 '15 at 13:33

For many years I've been using utility RevoSleep for exactly that purpose - it has simple taskbar popup menu that allows to manually or automatically spin-down (sleep) or spin-up (wake) any hard drive of your computer.

While this tool is originally made almost 8 years ago for Windows XP, it still works even these days in Windows 10. I suggest to check that out.

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