zarusz or anyone finding this through search engine. I bought a Seagate HDD which needs sdparm. With the above, I managed to optimise to one command:
Code
docker run --rm --privileged --device=/dev/sda:/dev/sda arm64v8/debian /bin/bash -xec 'apt-get update && apt-get install sdparm -y && sdparm --flexible -6 -l --save --set STANDBY=1 /dev/sda && sdparm --flexible -6 -v -S -p po --set=SCT=9000 /dev/sda'