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.) ![]()
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