Once that’s done, open a new Finder window. Click the drive in the left-hand column and go to “Partition.”Ĭhoose the “Mac OS Extended (Journaled)” format, then GUID Partition Table.
Press Cmd-Space and type in “disk” to open Disk Utility. If you have, go to Purchases, hold down Option, and click “Download.” If you’ve not already bought it, the OS is only $20. If you don’t, try visiting the Apple store and asking for them to help.įirst, download a copy of Mountain Lion from the Mac App Store. You can set all this stuff up before a crash as a precautionary measure (which I recommend). In order to save your Mac, you’ll need a Mac.
#Mac os x for usb mac os#
Reinstall OS X From a Flash Drive Set up the USB Drive With Mac OS Installer It’s easy- all you need is 8 GB of storage and another Mac. However, if you don’t have internet access or don’t want to wait for the download, you can always try to install OS X from a flash drive. Officially, Apple recommends restarting your computer, holding down Cmd-R, and downloading the necessary software from the internet. That means reinstalling the entire operating system from scratch. Sometimes everything else fails, and you have to start from scratch. Macs are no exception, fanboy wishful thinking to the contrary.
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