Are you familiar with tlp?
If not, try installing
tlpui
Go to Disks and configure it like that:
DISK_IDLE_SECS_ON_AC=0
DISK_IDLE_SECS_ON_BAT=0
then click on DISK_DEVICE_ID → Edit and for each disk you want to do that set:
DISK_APM_LEVEL_ON_AC="255 255"
DISK_APM_LEVEL_ON_BAT="254 254"
# Timeout value until the spindle motor stops when the disk is idle
DISK_SPINDOWN_TIMEOUT_ON_AC="0 0"
DISK_SPINDOWN_TIMEOUT_ON_BAT="0 0"
Then press Save button on top, and reboot just in case (i don’t remember if it’s must, but…)
Hopefully that should work, should mean that drives will spin always (which anyway is much better for longevity of HDD)