This is a disk protection user-space daemon. It monitors the acceleration values through an interface and automatically initiates disk head parking if a fall or sliding of the laptop is detected.
Currently, the following interfaces are supported:
On ThinkPads, it is recommended that you use this daemon with the hdaps module provided by tp-smapi rather the one in the kernel, as this will save you a bit of power and will work on a wider range of ThinkPads.