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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. Proceed with the installation and monitor the download.Choose the option to Install OS X and select the USB drive as the destination.(Internet Recovery by including the Option key here will also work.) Restart to Recovery mode by holding Command-R at startup.

The copy of OS X that is included with your Mac is not considered a retail purchase, so unfortunately you will be able to access it only through Apple's installer. However, this requires you to purchase a separate license of OS X. One easy option (which I have discussed before) is to purchase OS X from the App Store, then create a boot drive from its contents. Granted, the use of Time Machine makes restoring from backup relatively easy, but if for some reason you need to repartition the hard drive or install a new one on your system, you will first need to install OS X again. While convenient for those with fast broadband connections, sometimes you may find yourself in a location without fast Internet and would benefit from having a way to reinstall OS X from scratch. Instead, if you wish to reinstall OS X you simply reboot to the OS X Recovery HD and use the tools there to format your hard drive (should you choose to), then run the installer to download OS X from Apple's servers.

Since its move to online purchasing and distribution of its operating system software, Apple has no longer included gray recovery DVDs with its Mac systems.