![]() Drag that folder into the Installation folder on your destination drive. Open the mounted OS X Install ESD volume, and you’ll see a folder called Packages.Inside that drive, open the System folder, and then open the Installation folder. Open the destination drive-the one you’re using for your bootable installer drive, which has been renamed OS X Base System.Wait for the restore procedure to finish, which should take just a few minutes.Click Restore, and then click Erase in the dialog box that appears if prompted, enter an admin-level username and password. Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data.(If the destination drive has additional partitions, just drag the partition you want to use as your bootable installer volume.) Drag the latter-the one with the drive name-into the Destination field on the right. 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. In Disk Utility, find this destination drive in the left sidebar.Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Yosemite installer.Drag the BaseSystem.dmg icon into the Source field on the right (if it isn’t already there).Select BaseSystem.dmg in Disk Utility’s sidebar, and then click the Restore button in the main part of the window.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.Open the Terminal app (in /Application/Utilities), then type (or copy and paste) the following command, and then press Return: defaults write AppleShowAllFiles 1 & killall Finder(This tells the Finder to show hidden files-we’ll re-hide such files later.) Several of the files you’ll need to work with are hidden in the Finder, and you need to make them visible.That volume will appear in the Finder as OS X Install ESD open it to view its contents. Double-click InstallESD.dmg in the Finder to mount its volume.In the folder that appears, open Contents, then open Shared Support you’ll see a disk image file called InstallESD.dmg.Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu.It’s called Install OS X Yosemite.app and it should have been downloaded to your main Applications folder (/Applications). Once you’ve downloaded Yosemite, find the installer on your Mac. ![]() Right-click (or Control+click) the Yosemite installer to view its contents. 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 like, you can rename the drive from its default name of Install OS X Yosemite, though I think it’s kind of a catchy name. You now have a bootable Yosemite install drive. (see the screenshot above), which could take as long as 20 or 30 minutes, depending on how fast your Mac can copy data to your destination drive. Wait until you see the text Copy Complete. The program then tells you it’s copying the installer files, making the disk bootable, and copying boot files. The Terminal window displays the progress of the process, in a very Terminal sort of way, by displaying a textual representation of a progress bar: Erasing Disk: 0%… 10 percent…20 percent… and so on.Type your admin-level account password when prompted, and then press Return.Paste the copied command into Terminal and press Return. Launch Terminal (in /Applications/Utilities). ![]()
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