ATAidle sets the standby timer on ATA hard drives so they spin down when the 
period of inactivity has expired.  To use it you must be running FreeBSD 6.2 
or newer - alternatively, you can also run it on Linux - it's been tested with 
kernel 2.6.1, but should work with any recent kernel.

Supplying a device name without any parameters will display 
information about the specified device.

Notes on Auto Acoustic Management (AAM) and APM support

Meaning of various AutoAcoustic values:

0		Acoustic management disabled.
1		Minimum noise.
2-126		Intermediate noise levels.
127		Maximum performance, maximum noise. 

Meaning of various APM values:

1		Minimum power usage with Standby (spindown).
2-127		Intermediate power usage with Standby.
128		Minimum power usage without Standby (no spindown).
129-253		Intermediate power usage without Standby.
254		Maximum performance, maximum power usage.

Some values may not be supported, in this case you will see an error
message 'Set APM failed: Inappropriate ioctl for device'.
