Keep the installer from being deletedLike all recent versions of OS X, Yosemite is distributed through the Mac App Store. And if your Mac is experiencing problems, a bootable installer drive makes a handy emergency disk.Run OS X installer.DMG download in step 1 to mount it’s virtual hard drive into system > Launch Disk Utility, select the right USB in the left side > Click pn Restore > Drag and drop OS X installer.DMG into Source > Drag and drop USB into Destination > Click on Restore button.As with previous versions of OS X, it’s not difficult to create a bootable installer drive from the Yosemite installer, though the processes have changed slightly since Mavericks. 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.(Note that the createinstallmedia tool doesn’t work under OS X 10.6 Snow Leopard—it requires OS X 10.7 Lion or later.)The Disk Utility method is the way to go for people who are more comfortable in the Finder (though it does require a couple Terminal commands), and it works under Snow Leopard, Lion, Mountain Lion, Mavericks, and Yosemite. If you don’t, you’ll have to redownload the installer from the Mac App Store before you can create a bootable installer drive.Create the Yosemite install drive: The optionsI’ve come up with three ways you can create a bootable OS X install drive for the Yosemite: using the installer’s built-in createinstallmedia tool using Disk Utility or performing the Disk Utility procedure using Terminal.The createinstallmedia method is the easiest if you’re at all comfortable using Terminal, it’s the approach that I recommend you try first. 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.
![]() Restore From Dmg Os X Password When PromptedType your admin-level account password when prompted, and then press Return. Paste the copied command into Terminal and press Return. Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data.![]() 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. 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).Right-click (or Control+click) the Yosemite installer to view its contents. 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 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. Mac ms office for mac change userWait 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’re replacing the deleted Packages alias with this Packages folder.) The folder is about 4.6GB in size, so the copy will take a bit of time, especially if you’re copying to a slow thumb drive. 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. You’ll see an alias called Packages. Inside that drive, open the System folder, and then open the Installation folder. Download the Yosemite installer from the Mac App Store and make sure it’s in your main Applications folder (/Applications)—it’s called Install OS X Yosemite.app. Option 3: Use TerminalIf you’re a Terminal jockey, you likely know that most of Disk Utility’s features can be accessed using shell commands—which means that you can perform the Disk Utility procedure using a few commands in Terminal. If you like, you can rename the drive from OS X Base System to something more descriptive, such as Yosemite Installer.You can use Disk Utility’s Restore screen to create a bootable Yosemite installer drive. Open the Terminal app, type (or copy and paste) the following command, and then press Return:Defaults write com.apple.finder AppleShowAllFiles 0 & killall FinderYou now have a bootable Yosemite install drive. You’ll likely want to re-hide invisible files in the Finder. Copy these files to the root (top) level of your install drive (OS X Base System, not into the System or Installation folder). Enter your admin-level account password when prompted.Sudo hdiutil attach /Applications/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg sudo asr restore -source /Volumes/OS X Install ESD/BaseSystem.dmg -target /Volumes/Untitled -erase -format HFS+(During this step, you’ll be prompted to confirm that you want to erase the contents of Untitled. Make sure each command finishes—in other words, you see a command prompt—before running the next command. Open Terminal and type (or copy and paste) the following commands, one by one, pressing return after each to run it. (The Terminal commands I provide here assume the drive is named Untitled.) Rename the drive to Untitled.
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