Well that sounds very promising.
Is disk sleep not working at all?
I would not like it if my hd (HUH721212ALE600) would run 24/7 with 5-7 watts.
Works normally. If you get an older version of the firmware, simply update and, if necessary, set the time or turn off completely and use hdparm.
https://wiki.odroid.com/odroid-xu4/software/jms578_fw_update