9L0-422 Web TestEngine demo

Start up from the OS X Recovery partition, choose Target Disk Mode from the Startup Disk menu, then restart the Mac.

Hold down the S key as the Mac starts up, then enter the command shutdown -r -target.

Restart your Mac, then hold down the T key as the Mac starts up.

Hold down the Option key as the Mac starts up, until a dialog appears, then select Target Disk Mode from the dialog.