You’ll give up some hard drive space, for instance-an amount of space equal to your machine’s RAM, plus another 750MB. There are some downsides to this, however. When you next connect power, Safe Sleep will read the contents of the hard drive back into RAM, letting you come right back to where you were-with open applications and documents intact. (This also means you can easily swap batteries on that long cross country flight.) Instead, your machine enters a hibernation mode, whereby it’s using no power at all. In the event that your Mac loses power completely while sleeping (the battery falls out, you lose the machine for three weeks, etc.), you won’t lose any of your work. Read the article for a more detailed description, but basically, Safe Sleep puts the contents of your machine’s RAM onto the hard drive each time you put it to sleep.
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