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Mac computers, running MacOS, offer a feature which Apple calls "safe sleep":

"Every time the Mac goes to sleep, the current state of the computer is saved to the drive, including all open applications and documents. ... If the battery is depleted or replaced while the computer is in 'safe sleep', the next time it is turned on, instead of re-booting, the previous state of the computer will be loaded from the sleepimage file." (Source.)

How can you enable "safe sleep" on a Windows PC?

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2 Answers 2

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Microsoft calls it "hybrid sleep"

Microsoft calls the feature "hybrid sleep". (Source.)

It's normally disabled on laptops, for good reasons

In an article, Raymond Chen writes that the feature is disabled by default on Windows laptops, for good reasons:

"Hybrid sleep is on by default for desktop systems but off by default on laptops. Why this choice?

"First of all, desktops are at higher risk of the power outage scenario wherein a loss of power (either due to a genuine power outage or simply unplugging the computer by mistake) causes all work in progress to be lost. Desktop computers typically don’t have a backup battery, so a loss of power means instant loss of sleep state. By comparison, laptop computers have a battery which can bridge across power outages.

"Furthermore, laptops have a safety against battery drain: When battery power gets dangerously low, it can perform an emergency hibernate.

"Laptop manufacturers also requested that hybrid sleep be off by default. They didn’t want the hard drive to be active for a long time while the system is suspending, because when users suspend a laptop, it’s often in the form of 'Close the lid, pick up the laptop from the desk, throw it into a bag, head out.' Performing large quantities of disk I/O at a moment when the computer is physically being jostled around increases the risk that one of those I/O’s will go bad. This pattern doesn’t exist for desktops: When you suspend a desktop computer, you just leave it there and let it do its thing."

(Emphasis mine.)

You can override the default, in exceptional cases

Perhaps the reasons don't apply to you. For example, perhaps you're using a laptop which you never take anywhere, and which no longer has a working battery. If this is the case, you can enable "hybrid sleep" manually. Instructions are in the aforementioned article.

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    The Chen article is from 2011, I don't think the issues listed are much of a concern now that SSDs have all but replaced HDDs in every platform.
    – essjae
    Sep 20, 2022 at 11:44
  • With a modern laptop, hard-drive damage is indeed no longer likely. ❧ Remaining concerns are: A.) SSD wear. B.) Entering hybrid sleep mode uses up some electricity. C.) The machine may be sealed inside a poorly-ventilated laptop bag. Therefore, it may be better not to try to store hybrid-sleep data to disk at all. ❧ Since a laptop normally won't lose any data in a power outage, I'm still not convinced that the benefits of hybrid sleep outweigh the concerns. Sep 20, 2022 at 20:34
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sleep mode uses very little power and keeps your commands and process saved in the memory.

The steps mentioned below can be followed to activate sleep mode in Windows.

First, click on the ‘’Start’’ button. Now click on ‘’Settings -> System -> Power & Sleep -> Additional Power Settings’. Select the option ‘’Choose what the power buttons do’’(for laptops click on “Choose what closing the lid does”). Under the heading “When I press the power button”, select the ‘’Sleep’’ option and click on ‘’Save Changes’’ In this way, you can enable safe sleep mode on windows pc.

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