Is that a built-in function on the HDD or Windows 10?-1-power-management.jpg Is that a built-in function on the HDD or Windows 10?-2-advanced-settings.jpg

I had rebooted it for the above to take effect. I plugged in the HDD and left it idle. It stopped spinning after 23 minutes. Does it go to show the following?

Bree said:
an external USB HDD is quite capable of powering itself down while not being accessed without any help from a Windows OS.