Stop disk clicking

If your disk is clicking on inactivity, it could be because it has too aggressive power management set. Each click will increase Load_Cycle_Count. Check that:

$ sudo smartctl -A /dev/sda | grep Load

To stop it, use hdparm:

$ sudo hdparm -B 254 /dev/sda

See how to force the hdparm setting on boot and resume: https://wiki.ubuntu.com/DanielHahler/Bug59695