by Tom Nelson
Safe Boot has been a feature of OS X almost since its inception. Even before OS X, the Mac had a special startup method that prevented system extensions from loading. This allowed you to troubleshoot problems caused by badly coded extensions.
Screen shot © Coyote Moon, Inc.
Safe Boot performs an equivalent task in OS X. It prevents many kernel extensions from loading, checks for problems with the startup drive and attempts to correct any problems it may find, disables all fonts not required by the system, keeps apps or services from automatically launching, and deletes most system caches.
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