Use Target Disk Mode

Another method for connecting two Macs so you can share files is with a FireWire cable and "Target Disk Mode." This method is meant as a temporary network and is especially helpful when one computer won't start up and you need to access the files on it.

The computer whose hard disk you want to see is the target computer. You won't be able to use the target computer during this process.

The computer that you're using to see the other computer is the host computer.

1.	Connect two computers with FireWire and unplug all other FireWire devices.
2.	If using a laptop as the target computer, plug in its AC adapter.
3.	Turn off the target computer. Leave the host computer turned on.
4.	Start up the target computer and immediately hold down the T key on its keyboard. Continue holding it down until a FireWire icon appears on its screen. Or in System Preferences on the target computer, you can choose Startup Disk, then click "Target Disk Mode." Restart the target computer and it will start up in Target Disk Mode. This is useful if you only have one keyboard between the two Macs.
5.	An icon of the target computer's hard disk appears on the host computer's Desktop. Double-click its icon to see the target computer's contents. Drag the files and folders you need to the host's Desktop.
6.	When you've finished copying files, drag the target computer's icon to the Trash to unmount it.
7.	Turn off the target computer and unplug the FireWire cable.