You may see a couple partitions under the drive: one named EFI and another with the name you see for the drive in the Finder.
OS X YOSEMITE DMG TO USB INSTALL
(This tells the Finder to show hidden files-we’ll re-hide such files later.)Ħ) Launch Disk Utility (in /Applications/Utilities) and then drag BaseSystem.dmg (in the OS X Install ESD volume) into Disk Utility’s left-hand sidebar.ħ) Select BaseSystem.dmg in Disk Utility’s sidebar, and then click the Restore button in the main part of the window.Ĩ) Drag the BaseSystem.dmg icon into the Source field on the right (if it isn’t already there).ĩ) Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Yosemite installer.ġ0) In Disk Utility, find this destination drive in the left sidebar. Open the Terminal app (in /Application/Utilities), then type (or copy and paste) the following command, and then press Return:ĭefaults write AppleShowAllFiles 1 & killall Finder That volume will appear in the Finder as OS X Install ESD open it to view its contents.ĥ) Several of the files you’ll need to work with are hidden in the Finder, and you need to make them visible. It’s called Install OS X Yosemite.app and it should have been downloaded to your main Applications folder (/Applications).Ģ) Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu.ģ) In the folder that appears, open Contents, then open Shared Support you’ll see a disk image file called InstallESD.dmg.Ĥ) Double-click InstallESD.dmg in the Finder to mount its volume. Right-click (or Control+click) the Yosemite installer to view its contents.ġ) Once you’ve downloaded Yosemite, find the installer on your Mac.
The procedure is a bit more involved with Yosemite than it was for Mavericks (which was itself a bit more involved than under Mountain Lion and Lion). Here are the steps for using it to create your installer drive. You’ll find Disk Utility, a handy app that ships with OS X, in /Applications/Utilities. If you don't, you'll 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, or-in this case-to 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. As 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. Like all recent versions of OS X, Yosemite is distributed through the Mac App Store.
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