Your drive must be formatted as a Mac OS Extended (Journaled) volume with a GUID Partition Table. Your OS X user account must also have administrator privileges. You just need the Yosemite installer, which you download from the Mac App Store, and a Mac-formatted drive (a hard drive, solid-state drive, thumb drive, or USB stick) that’s big enough to hold the installer and all its data. (And don’t forget that not all Macs have OS X Recovery.) What you needĬreating a bootable Yosemite installer drive is actually pretty easy. In fact, I think it’s a better emergency disk than OS X Recovery, because a bootable installer drive includes the full OS X installer, whereas OS X Recovery requires you to download 5+ GB of installer data if you ever need to reinstall the OS. It also serves as a handy emergency disk if your Mac is experiencing problems. 1 It’s great for installing the OS on multiple Macs, because you don’t have to download the 5+ GB installer onto each computer. I’ve long recommended creating a bootable installer drive-on an external hard drive or a thumb drive (USB stick)-for the version of OS X you’re running on your Mac.
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