Best mac cleaner for 10.7.54/20/2023 ![]() In other words, before macOS turns off all power to the system’s RAM, it makes an image of the system's current state, writes it to disk, and uses the sleepimage file that it creates to restore the system to the same state that the user left it in. With safe sleep on, when the Mac ‘falls asleep’ the contents of its main memory – open apps, desktop settings, work in progress, etc. This feature is similar to what is known as ‘hibernation mode’ in other operating systems. ![]() Clean 500MB of Junk for Free What Is Sleepimage?Įver since it was introduced by MacBook models in late 2005, Apple has used a neat feature called safe sleep.
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