Drag the slider according to your preference and hit the ok button. if the problem is preventing the mac from booting or causing it to crash or perform erratically, reformatting and reinstalling macos might be the only answer. The main reason why you may need to reformat your mac is if the startup drive has developed a problem that disk utility or a third party disk management tool can’t fix. There are a ton of reasons why you may need to reformat your mac it's slowing down, too many un needed files to delete manually, major technical issues or. In today’s video, we show you how to completely reformat your mac and set it back to factory settings, all without the need for a recovery disk or drive. if you want to play it safe and create a bootable install drive for mac os x, you can do so using our guides here for lion mountain lion, mavericks, yosemite, and el capitan. All without the need for a recovery disc or thumb drive.
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