Hi, With the help of many threads in this forum, I set up spin down of the usb attached HD on my RT-N16. It worked fine for me for one day, and then it stopped working. Here is the details: What I did in initial setup: 1. created idle-disks.sh and idle-disks.conf under /tmp/home/root 2. created a whitelist file containing my HD info under /var/idle_disks 3. Started the script by running idle-disks.sh & I then observed the spin down behavior a couple of times. It's working fine, great. One day later, I mapped network drive under windows to my HD, and after a while, I noticed the spin down doesn't happen anymore. Thinking it may be caused by the mapped network drive, I disconnected it and still the spin down doesn't happen. What could be wrong here? Now I thought I may have to reboot the router, so I went ahead and reboot the router. After the reboot, I logged in the router and found the two files I created in step one are gone. It's understandable since they are under /tmp/home/root. Can anyone tell me how to make these file permanent? Thanks!