So the SATA HAT has been working perfectly with 2x HDDs for a month but i have detected a problem with it. In case if I disconnect the 12v power plug from SATA HAT and reconnect it, the system powers on immediately and once booted, SATA HAT is not detected (drives are spinning but not showing up. ls...

Thanks @igorp

I was able to set the spin down time using the gnome-disk-utility and now the drives spin down at the set time.

I purchased the NanoPi M4 few days back along with SATA HAT. it is running fine but i have noticed that the hard disks keep spinning constantly when not in use even when they are not mounted. Usually the HDD spins down after some time if not in use but not with the SATA HAT. If i connect the same HD...