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A power-off mode that preserves the last state of the computer. Turning the computer on after hibernating eliminates booting the operating system and reloading all the applications and data.

When hibernate is activated, the contents of memory (RAM) are written to storage (hard disk, SSD) and the computer is turned off. When turned back on again, the previous memory state is read from storage, and all applications appear exactly as they did the moment hibernate was triggered.

Hibernate vs. Sleep Mode
Hibernate is power off, whereas sleep mode is power on with the screen and hard disks turned off. In sleep mode, the RAM chips are constantly refreshed in order to retain their content, and the CPU is placed into a low-power state. Although restoring from hibernate is faster than a cold start, coming out of sleep is immediate. Turning the computer back on from either mode eliminates having to reload all applications and data.

Hybrid Modes
Some laptop computers invoke both modes automatically. When put into sleep mode by the user, the computer may automatically go into hibernate mode when the battery reaches a low level. An alternative hybrid mode activates hibernate when the computer enters sleep mode, but the computer is not turned off. If the battery runs out while in sleep mode, the contents of memory have already been saved. See memory.
References in periodicals archive ?
In our area, the only true hibernators are the groundhog (or woodchuck) and the thirteen-lined ground squirrel.
Besides that, dramatic changes due to wake and deep hibernation cycles result in increasing risk of oxidative stress in sensitive tissues of mammalian hibernators (Carey et al.
Under field conditions with seasonally variable soil temperatures, these body-temperature patterns likewise hold, at least qualitatively, for free-ranging hibernators within Tamias (chipmunks-Humphries et al.
Hibernators are physiologically adapted to having a resting period.
We knew that bears decreased their body temperatures to some degree during hibernation, but in Alaska we found that these black bears regulate their core temperature in variable cycles over a period of many days, which is not seen in smaller hibernators and which we are not aware has been seen in mammals at all before," said Eyivind TE[sup.
Such large, multi-day fluctuations in core body temperature are unlike those observed in any other hibernators before.
Wildlife biologists note that woodchucks are true hibernators and that means heart, respiration and overall metabolism rates are greatly reduced while the animal lives off stored fat reserves.
IT may be a mystery to those who lament the passing of summer, but home hibernators (I'm one of them) can't wait for the chill in the air so they can cosy up at home.
Ladybirds are communal hibernators, hundreds, or even thousands, congregating together.
Facultative strains included enterobacteria in non-hibernating frogs and Pseudomonas species in hibernators.