In my PC I have six hard-disks which are by default off, but can be turned on individually using hdd-switch.
I have x2 HGST x2HGST/WD x1Toshiba and x1Seagate HDDs.
Seagate disk doesn't wake up when I turn it on using HDD switch. I know it's HDD issue because on same SATA port other HDD brands...