If you dont, youll have to redownload the installer from the Mac App Store before you can create a bootable installer drive. If you plan to use that installer on other Macs, orin this caseto create a bootable drive, be sure to copy the installer to another drive, or at least move it out of the Applications folder, before you install. If you want to erase the drive on a Mac before installing Yosemite, or start over at any time, you can use a dedicated installer drive to boot that Mac, erase its drive, and then install the OS clean and restore whatever data you need from a backup.Īnd if your Mac is experiencing problems, a bootable installer drive makes a handy emergency disk.Īs with the Mavericks installer, if you leave the Yosemite beta installer in its default location (in the main Applications folder) when you install OS X 10.10, the installer will delete itself after the installation finishes.
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