The next step will completely erase the contents of the USB flash drive (or any other bootable device you dragged to the Destination field).
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Drag the USB flash drive from the left-hand pane to the Destination field.If not, drag the BaseSystem.dmg item from the left-hand pane to the Source field. In the Restore tab, you should see BaseSystem.dmg listed in the Source field.Once the file is present in the Disk Utility sidebar, be sure to select BaseSystem.dmg, not InstallESD.dmg, which will also be in the list. If the BaseSystem.dmg item is not present in the Disk Utility sidebar, you can drag it there from the Finder window that appeared when you mounted the InstallESD.dmg file. It may be listed near the bottom, after your Mac's internal and external drives. Select the BaseSystem.dmg item listed in the left-hand pane of the Disk Utility window.Make sure the target USB flash drive is connected to your Mac.Launch Disk Utility, located at /Applications/Utilities.
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Download yosemite installer download install#
The next step in the creation of a bootable copy of the OS X Yosemite installer is to use Disk Utility's Restore capabilities to create a clone of the OS X Install ESD image you mounted on your desktop. We're going to use this Finder window in subsequent steps, so leave this window open. DS_Store, BaseSystem.chunklist, and BaseSystem.dmg. Now that the files are visible, you can see that the OS X Install ESD image contains three additional files.When you've done that, we can continue.We need to use Terminal to make the system files visible. In actuality, there's an entire bootable system on the image file that is hidden. You may notice that the mounted image seems to contain only a single folder, named Packages.This will mount the InstallESD image on your Mac's desktop and open a Finder window that displays the contents of the mounted file.Here you will find the disk image that contains the files we need to create a bootable installer.
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