Select Recovery HD from the Startup Manager. OS X Recovery Disk Assistant lets you repair disks or reinstall OS X without the need for a physical disc. A few of the error scenarios are described here: Partitioning option grayed out in Disk Utility when you. To access OS X Recovery, reboot the computer while holding the Option key. Sometimes, flash drive partitioning runs into problems. When the OS X Recovery Disk Assistant completes, the new partition will not be visible in the Finder or Disk Utility. Insert an external drive, launch the OS X Recovery Disk Assistant, select the drive where you would like to install, and follow the on-screen instructions. To create an external OS X Recovery, download the OS X Recovery Disk Assistant application. If your Mac came with supplied with OS X 10.7 or later the primary boot disk should already contain a Recovery HD Download Apples Lion Recovery Disk Assistant.

Note: In order to create an external OS X Recovery using the OS X Recovery Assistant, the Mac must have an existing Recovery HD. The OS X Recovery Disk Assistant lets you create OS X Recovery on an external drive that has all of the same capabilities as the built-in OS X Recovery: reinstall Lion or Mountain Lion, repair the disk using Disk Utility, restore from a Time Machine backup, or browse the web with Safari. And, if all else fails, you can always use the Recovery Disk Assistant that.

Built right into OS X, OS X Recovery lets you repair disks or reinstall OS X without the need for a physical disc. There are actually three ways to recover a dead Mac or a dead hard drive.

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