I make all my webpages play a sound file

at a random interval that sounds like a hard drive failing

>>8
http://www.datarecoverygroup.com/articles/freezing-your-hard-drive-bad-idea
https://www.youtube.com/watch?v=ad1uVAB5bNA

https://superuser.com/questions/343198/destroy-a-hard-drive-without-proper-equipment
Make a nice campfire (if you are in a rural area) or a ghetto-oven from a barrel (if you are in an urban area).

When the fire is ablaze, put the HDD in the center of the fire. Keep the fire burning for at least an hour or so, in order to let the magnetized surface of the HDD platters to loose their orientation, or even melt if they are made of aluminium.