On the source Mac either: Restart the Mac and once it starts booting hold down the T key until you see the Target Disk Mode screen with a bouncing Thunderbolt logo. Restart the target Mac and wait till Thunderbolt/FireWire logo appears on the screen. Click on the lock icon and enter the administrator password, then click Target Disk Mode. Turn on the target Mac, go to Apple menu System Preferences Startup Disk. Instead, the Mac's firmware enables its drives to behave as a SCSI, FireWire, Thunderbolt and/or USB-C external mass storage device. When a Mac that supports Target Disk Mode is started with the 'T' key held down, its operating system does not boot. Target Disk Mode (sometimes referred to as TDM or Target Mode) is a boot mode unique to Macintosh computers.
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