External drives not spinning down (sleep/powersaving)

Soldato
Joined
11 Jun 2003
Posts
7,613
Location
The Shadows (london)
I've got a mac mini running windows 10 pro 20H2 19042.906
3x USB HDD's attached which seem to not want to go to sleep.

The machine hosts a VM using Virtualbox stored on internal storage (the external drives are not shared or used for the VM).
the machine also runs a plex media server on windows (2 of the drives have plex media shares).
using comodo internet security.

the only drive that seems to spin down is one of the drives that have media shares for plex.
the other media drive doesn't seem to spin down (even though nothing is accessing the media).
the last drive which is only used for backup doesn't want to spin down and is often not ejectable.

looking at the task manager and resource monitor I can't see anything out of the norm. and there's little to no activity on any drive either.

what should I check to get this to work properly?
 
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