Sleep vs. hibernate in Windows

Q: What’s the difference between sleep mode and hibernate mode on Windows?

A: These are two power-saving options. Both are designed to allow you to resume work on your PC faster than if you shut your computer down entirely.

You can remember the difference between sleep and hibernate by remembering the difference between the words "sleep" and "hibernate" before computers came along. Essentially, when you sleep, you can wake up again pretty quickly. If you were to hibernate, you’d be unavailable for a bit longer.

The same goes for your Windows computer. Sleep mode shuts down some components of your PC, but everything that is active in memory (RAM) remains alive, so that when you "wake" your computer up by pressing a key or the power button, the machine returns to the state in which you left it almost immediately – with applications, browser windows, and documents in exactly the same state.

As you might imagine, a computer in sleep mode continues to use some power, since the contents of RAM must be maintained. So if you’re using a notebook computer on battery, be careful: putting your notebook to sleep can still result in a dead battery after a while. Use this mode when you know you’ll be returning to work on your computer shortly.

Hibernate mode, by contrast, takes a snapshot of everything you have in RAM and writes it to a special hard disk file. Hibenate mode then turns your computer off entirely, using no more electricity than if you shut the PC down the conventional way. The advantage of hibernate mode is that your PC will boot up a bit faster than if you booted it after a complete shutdown. Use this mode when you plan not to need your computer for a while.

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