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What is the difference between (these four) sleep states?

What are the sleep modes and standby modes in Windows?

How can you differentiate them?

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marked as duplicate by techie007, Sathya Dec 20 '11 at 10:00

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What are the sleep modes and standby modes in Windows?

Standby is known as 'sleep' mode. In 'Stand by' mode, Windows OS turns off non-essential hardware resouces such as hard disk, removable disks, monitor. The system ten be able to reactivate very quickly when you press any key or move the mouse. FYI - You cannot power-off the system in 'Stand by' mode.

from Microsoft:

Sleep is a power-saving state that allows a computer to quickly resume full-power operation (typically within several seconds) when you want to start working again. Putting your computer into the sleep state is like pausing a DVD player—the computer immediately stops what it’s doing and is ready to start again when you want to resume working.

Check this Sleep and hibernation at microsoft website to know more about these.

How can you differentiate them?

  1. Sleep mode puts your work and settings in memory and draws a small amount of power, hibernation puts your open documents and programs on your hard disk, and then turns off your computer.
  2. In all of the power-saving states in Windows, hibernation uses the least amount of power.
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In Windows 7 there is the concept of "hybrid sleep" which not only puts the computer to sleep but also copies the contents of the memory to disk (a la hibernation). The advantage of this is that you get all the fast booting goodness of sleep but if power is lost then the computer can fall back to resuming from the hibernation file - rather than making you fully restart Windows again and lose your open windows, files or programs. –  Richard Dec 14 '11 at 14:01
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theres normal standby (ram is powered), hibernate (sleep) where the contents of ram are stored on the hdd and hybrid where the ram-content is keept and additionally written to disk (to prevent data loss on power outage)

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+1 for mentioning actual shutdown in hibernate mode. –  Marnix Dec 14 '11 at 12:05
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Standby is Suspend-to-Ram (STR), Hibernate saves the RAM contents to disk.

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