Maybe I'm wrong, but as I recall, there need to activate the GPIO port (by default it is off) that would have included power to SATA adapter. I have not been able to obtain from the manufacturer info, which ports are needed for this.
I tried both device trees ( this is what I did as per instructions: booting from SD/USB, simply connect SD/USB to your computer, download a proper device tree, rename it to dtb.img and place on SD/USB)
They both did not spin up the harddisk connected to the SATA port.
When I boot in Android, I can enable the SATA port. The disk spins up and is accessible to the Android operating system.
The disk keeps spinning when I turn off the system.
When I boot with the SD-Card:
as soon as I press the power button and the blue light comes on, the disk spins down and has no power any more.