Apple made it so that if you restart your computer with the shift key held down, certain parts of the system are deactivated, and, totally in the background, and through no indication that it’s going on, your Mac will run these routines to repair your hard disk...if there’s any corruption.
It does what’s known as a “repair disk”, which is a function that you can run manually by running disk utility, but this makes it even easier. You don’t have to run disk utility at all.
You just restart your computer with the shift key held down. (And then restart again without holding down the shift key.)
Randy B. Singer
Macintosh OS X Routine Maintenance
Macintosh author
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