Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Controlling the Hard Disk

IsSpindownDisabled

You can use the IsSpindownDisabled function to find out whether automatic hard disk spindown is enabled.

Boolean IsSpindownDisabled();

DESCRIPTION

The IsSpindownDisabled function returns a Boolean true if automatic hard disk spindown is disabled, or false if spindown is enabled.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for IsSpindownDisabled is 8 ($08) in the low word of register D0. The Boolean result is passed in the low byte of register D0.