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Important: The information in this document is obsolete and should not be used for new development.

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Inside Macintosh: Devices /
Chapter 6 - Power Manager / Power Manager Reference
Power Manager Dispatch Routines / Controlling the Hard Disk

HardDiskPowered

You can use the HardDiskPowered function to find out whether the internal hard disk is on. 

Boolean HardDiskPowered();
DESCRIPTION
The HardDiskPowered function returns a Boolean value indicating whether or not the internal hard disk is powered up. A value of true means that the hard disk is on, and a value of false means that the hard disk is off.

ASSEMBLY-LANGUAGE INFORMATION
The trap is _PowerMgrDispatch ($A09E). The selector value for HardDiskPowered is 6 ($06) in the low word of register D0. The Boolean result is returned in the low word of register D0.

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© Apple Computer, Inc.
3 JUL 1996