[Unit]
Description=Custom hdparm settings
ConditionPathExists=/sbin/hdparm

[Service]
# -M = accoustic (128=quiet, 254=fast)
ExecStart=/sbin/hdparm -M 128 /dev/sdb
ExecStart=/sbin/hdparm -M 128 /dev/sdc
# -S = standy timeout (252 =  21 minutes)
ExecStart=/sbin/hdparm -S 252 /dev/sdb
ExecStart=/sbin/hdparm -S 252 /dev/sdc
Type=oneshot

[Install]
WantedBy=multi-user.target