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. Select BaseSystem.dmg in Disk Utility’s sidebar, and then click the Restore button in the main part of the window.ĭrag the BaseSystem.dmg icon into the Source field on the right (if it isn’t already there).Ĭonnect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Yosemite installer. 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. (This tells the Finder to show hidden files-we’ll re-hide such files later.) 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 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. In the folder that appears, open Contents, then open Shared Support you’ll see a disk image file called InstallESD.dmg.ĭouble-click InstallESD.dmg in the Finder to mount its volume. 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). See How to make a bootable OS X 10.10 Yosemite install drive at .įind the Yosemite installer on your Mac.

Create bootable yosemite usb from dmg