The RAM is copied to the hard drive before sleep mode is initiated, preserving the RAM contents in the event of a power loss.ĪCPI is the current standard for power management, superseding APM and providing the backbone for sleep and hibernation on modern computers. Though sleep and Hibernate are generally thought as two separate functions, some modern portable Macintoshes, Windows Vista (termed Hybrid Sleep), and some specially configured Linux machines also feature a variation of Sleep mode that incorporates the strengths of Hibernate. Because of the large power savings, most laptops automatically enter this mode when the computer is running on batteries and the lid is closed. When placed in this sleep mode, aside from the RAM which is required to restore the machine's state, the computer attempts to cut power to all unneeded parts of the machine. Sleep mode can go by many different names, including Stand By (for Microsoft Windows 95-Server 2003), Sleep (for Mac OS 8)-(Mac OS X, Windows Vista, Windows 7, Windows Server 2008), and Suspend (Linux).

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