I am looking into putting together 1-2 sata drives on a dedicated board (similar to raspberry PI).
I saw that there are some Mini-PCIe to sata adapters but these only contain the data link and the power would be sent to HDD by a separate wire.
My question: the mainboard/computer needs to act as a relay on the power cable sent to HDD and cut power there? OR the spin-down/sleep HDD command is sent to the HDD by the sata connector and basically tells the drive to cut it's own power source.