i maybe have a related issue… thought i am not using a NAS.
i have a new 4TB WD blue and issues with it going into sleep mode (spindown).
it is configured as drive E: and a pure DATA disk.
i replaced a 3TB WD green that had no issues going into sleep mode … it worked just fine.
i know how to setup energy saving features in windows 10 and i made sure that the system is not accessing the 4TB WD blue, preventing it from going into sleep mode.
there is no cache or swapfile on E: there is no tool accessing the drive.
again… when i replace the 4TB BLUE with the 3TB GREEN all works as expected.
the drive is a DATA drive as i wrote so it could be idle most of the time.
and i hear the annoying noise the drive makes, as i have an absolute silent system otherwise.
the GREEN is a WDC WD30EZRZ-00WN9B0
the BLUE is a WDC WD40EZRZ-00WN9B0
im pretty much clueless why this drive won´t go to sleep (spindown).
there is a tool called HDDscan that can be used to manually spindown the drive.
i tried it and it worked with my 4TB blue… but that is not how it should be.
something changed from the green to the blue drives… and not to the better.