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Sleep mode and hibernation can be combined: the contents of RAM are copied to the non-volatile storage and the computer enters sleep mode. This approach combines the benefits of sleep mode and hibernation: The machine can resume instantaneously, and its state, including open and unsaved files, survives a power outage.
Machine state is held in RAM and, when placed in sleep mode, the computer cuts power to unneeded subsystems and places the RAM into a minimum power state, just sufficient to retain its data. Because of the large power saving, most laptops automatically enter this mode when the computer is running on batteries and the lid is closed.
Reed switches have been used in laptops to put the laptop into sleep/hibernation mode when the lid is closed. Speed sensors on bicycle wheels frequently use a reed switch to actuate briefly each time a magnet on the wheel passes the sensor.
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Sleep is the default power suspension state (instead of shut down) for desktop computers and mobile PCs such as laptops [75] [76] [81] and it replaces the standby feature of previous versions of Windows. [82] To ensure that the transition to sleep is reliable, Windows Vista does not allow sleep to be vetoed.
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Attached display, lid top Located on the body of a PC (notebook, desktop, or server), e.g. on the top of a laptop's lid, or a media center's front panel. Remote display Located off of the PC, and talks to the PC through a wired or wireless network protocol.