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I have an internal disk which is noisy and seldom used. With previous versions of OSX I was able to spin it down by using diskutil eject, but with the latest High Sierra 10.13.4, after a few seconds it powers up again.

I am looking for a way to stop it powering up again or totally disabling it without physically opening the Mac.

Is this possible with software?

Note 1: Disk is not even mounted, I have it disabled in /etc/fstab. No matter which the sleeping time is, the disk never spins down. It only does afer running diskutils eject, but in few seconds it restarts. In previous versions of OS X it didnt happen, it switched off correctly.

Note 2: In the previous OS version (El capitan), I have it normally mounted, and unmounting it from the Finder was enough, it switched off correctly. This does not work now either.

Note 3: I tried disabling (kill -SIGSTOP) the processes "diskarbitrationd" and "diskmanagementd" just after disk ejection but result is the same, disk respwans after some seconds.

How to know which process is accessing the unmounted unit?

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    I’m curious what your sleep time is and if unmounting it helps? If so we can help you script that to run periodically or once at log in - apple.stackexchange.com/questions/3978 – bmike May 27 '18 at 13:38
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    Disk is not even mounted, I have it disabled in /etc/fstab. No matter which the sleeping time is, the disk never spins down. It only does afer running diskutils eject, but in few seconds it restarts. In previous versions of OS X it didnt happen, it switched off correctly. – Javier Vales Alonso May 27 '18 at 13:57
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    For the sake of completeness, in the previous OS version (El capitan), I have it normally mounted, and unmounting it from the Finder was enough, it switched off correctly. This does not work now either. – Javier Vales Alonso May 27 '18 at 14:07
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    Be sure to edit those details in to the main post - people often skip the comments entirely or they get hidden / cleared periodically for various reasons – bmike May 27 '18 at 14:08
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    What specific Mac are you using and what drive connection technology is being used internally. I assume some flavour of SATA. – IconDaemon May 27 '18 at 15:16

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