Standby vs Hibernate
Figure – Standby: Puts your computer in a low-power state so that you can quickly resume your Windows session.
Standby is a light "sleep" mode you can put your computer in. When you resume from Standby mode, you'll be exactly where you left off – all your work will still be on the screen.
To be safe, you have to save all your files before entering Standby mode, just in case the computer doesn't wake up correctly later. Indeed, while in Standby mode, your computer needs power to maintain its state. So for a laptop or desktop, if you're plugged in to wall power, then you're fine, but if you have a power failure, you may lose the Standby mode and any unsaved work. (Plus, you're consuming slightly more electricity while in Standby mode than while in either Hibernate or Turn Off mode.)
On a laptop, if you're not plugged in to the wall and you go into Standby mode, your laptop battery is being used and therefore there is a certain limited time you can stay in Standby mode before your battery is completely drained and the computer loses it's state. Then you'll be potentially losing work and doing a full reboot. So you can see Standby mode should be considered a temporary state you should place your computer in, when you expect to be coming back to it within a few hours.
Many laptops however will automatically transition into the more stable Hibernate mode after remaining in Standby mode for a specified period of time (perhaps an hour). These settings can be adjusted using Control Panel -> Power Options.
Certain laptops will occasionally have trouble resuming from standby state. The computer's running, but the screen doesn't wake up. You do not have that problem if you hibernate it, so always use Hibernate instead. Often the laptop manufacturer or video card manufacturer may have a driver update to fix such a problem.
How to Standby
Start -> Turn Off Computer -> Standby
or
Start -> Turn Off Computer -> "S"
This is often what happens when you just close the lid on a laptop or hit the power button on a desktop. Most modern desktops go into Standby when you hit the power button. If you try yours, and instead your computer just shuts right off without flashing a quick message about entering Standby mode, then you shouldn't use this method. Additionally, most newer desktops and some laptops have a button on the keyboard that puts your computer into Standby mode. Check your machine's documentation.
Hibernate
Figure – Hibernate: Saves your current desktop state to your hard disk so that you can resume where you left off, then shuts down your computer.
When a computer is Hibernating, it's the same as off, from a power consumption point of view. Your computer's memory is actually flushed out to disk just before powering off and stays there until you turn the computer back on. When the computer comes back on, it's exactly the way you left it. A computer can stay in hibernation mode for a much longer period of time than standby mode when unplugged, and it uses less electricity. It takes slightly longer to resume from Hibernation than from Standby. However, it's more secure because everything's written out to disk, and you're not dependent on a good power source while in Hibernation, as you are with standby.
Whenever taking your computer somewhere or when not using it for more than a few hours, opt for putting it into Hibernate mode rather than Standby mode, because it's more like being off. Standby is more of a half-sleeping "zombie" state.
How to Hibernate
Start -> Turn Off Computer -> Shift -> Hibernate (notice you
don't see the Hibernate option unless you hold down the
Shift key)
or
Start -> Turn Off Computer -> "H"
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Standby vs Hibernate
Originally Posted by raymacsor
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