#  hddtemp /dev/sd[bcdef]
   /dev/sdb: SAMSUNG HD103UJ: drive is sleeping
   /dev/sdc: WDC WD10EZEX-22RKKA0: drive is sleeping
   /dev/sdd: ST1000DM003-9YN162: drive is sleeping
   /dev/sde: SAMSUNG HD103SJ: drive is sleeping
   /dev/sdf: WDC WD10EZEX-22RKKA0: drive is sleeping

Different disks; looks like desktop types.

That means something else is waking up those disks. To verify
this use something like:

FS are not mounted and arrays stopped. There is nothing that wakes them up.
If a switch them off manually with hdparm -Y they stay off.