How to reduce disk access?

This is a follow-up question to *https://unix.stackexchange.com/questions/148731/how-to-reduce-temperature-on-a-dell-xps-l502x* . After reading the answer, I noticed that my harddrive is spinning constantly, even when running TLP in bat-mode (mostly default settings, laptop-mode=5). **What I already do** * /tmp is mounted as a tmpfs. AFAIK this is not recommended for /var/tmp, is it? * TLP is running with this configuration * / and /boot are ext4 mounted with commit=15,noatime * / is mounted from a LUKS partition, is this a problem? **What I am searching for** I guess that constant disk access is the major cause of my disk spinning all the time. Are there any other ways to reduce disk access and/or ways to allow the disk to spin down?