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To do that, follow our guide and then once again follow the steps described above. This sleepimage deletion can still be completed, but you will need to first disable SIP. In this situation the above command will trigger an error or a reply from Terminal that says “operation not permitted”. With macOS High Sierra, however, the sleepimage file was moved under the System Integrity Protection or SIP, which limits the system functions of the root user. In macOS versions prior to 10.13 High Sierra the sleepimage can be removed easily, just type in a command into Terminal:Īt this point you'll be prompted for the admin password. With macOS High Sierra Apple has apparently changed the way the operating system handles virtual memory, hence the difference in size between sleepimage and the amount of RAM installed in the machine. In this example the “1.0G” is the file size, meaning 1GB of data, but it doesn't reflect the amount of RAM the test machine has (8GB). rw-T 1 root wheel 1.0G Dec 3 08:55 /private/var/vm/sleepimageįrom this string of text, find the data that precedes the date and this will be the number that represents the size of the sleepimage. You can check the current size of the sleepimage by typing the following command into Terminal:
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How to Check the Current Size of the Sleepimage In other words, if you have 4GB of RAM, then the sleepimage size will also be 4GB, if the MacBook has 16GB of RAM installed then sleepimage will be 16GB, and so on…
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When once again connected to a power source and turned on, you'll find the computer in the state you left it.
This way your work is saved if, for some reason, the Mac completely runs out of power.
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.
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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.