hdapm is a command-line utility for setting the power management (APM) level on SATA hard drives that can be used to eliminate “chirping” or “clicking when idle” noises in some hard disks – especially useful for when you do late night coding sprees (or audio editing) and the little head parking clicks become an intolerable nuisance.

This page is mostly for reference and keeping a “a local copy”:cid:hdapm-1.2-source.tar.gz of the source code.