Once finished, you should be able to reboot your system with the Option key held down, then choose the USB drive which will load the OS X installer and allow you to reinstall OS X without the need for connection to the Internet. (If this is missing, then you likely waited too long to unplug the drive.) Copy this file to your computer, then use Disk Utility along with the standard instructions for creating an OS X installation drive to restore the contents of this image to your USB drive. Now you can reattach the external drive, on which you should see a folder called "OS X Install Data" that contains a disk image file called InstallESD.dmg. With the drive unplugged, your Mac will boot normally to its internal drive. When your Mac automatically restarts, it will display a black screen with no video output for a second or two.
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