Mac OS X includes an extremely useful boot utility called Target Disk Mode Target Disk Mode allows a user to transfer data from one Mac, to another Mac, via a FireWire or Thunderbolt connection.
In this tutorial, I'll show you how to set up your hardware for Target Disk Mode and then use it in three different scenarios.
Setting Up The Hardware
Start by setting up your hardware to use Target Disk Mode. Target
Disk Mode is only useful for sharing data between two Macs, so this
tutorial assumes that you have two Macs that need to share data (for
applications which we will discuss below). It is important to understand
the terms target Mac and host Mac. Simply put, the target Mac is the Mac you are transferring data from, while the host Mac is the Mac you are transferring data to.
Tip: The target Mac is the Mac you use as an
external hard drive and is started up first. The disk of the target Mac
is available to the host Mac and files can be copied from target to or
from the host.
The first thing you will need to do is determine what connection you
will use to link your two Macs. Target Disk Mode fully supports both
Thunderbolt and FireWire connections (though not USB).
If you have two recent model Macs with Thunderbolt ports, and you
have a Thunderbolt cable, Thunderbolt is the obvious choice for Target
Disk Mode because of its blazing fast data transfer rates. (Note,
Thunderbolt was introduced on the 2011 MacBook Pro and has come standard
on every Mac hardware update since. If you have purchased a Mac in the
last two years, there’s a good chance it has a Thunderbolt port, but you
may want to check the specs on your Mac just to make sure.
If both of your Macs do not have Thunderbolt ports, the next option
for connection is FireWire. Assuming both Macs have a FireWire port, you
will simply need a Firewire cable to link the two Macs.
You may find yourself, however, in a scenario where you are linking
an older Mac that has FireWire with, for example, a brand new MacBook
Air that does not have Firewire. If this is the case, you will need to
purchase Apple’s Thunderbolt to FireWire adaptor in order to use Target Disk Mode. Check your Macs' ports to determine what connection you will use to connect your two Macs.
Once you determine which connection you'll be using for Target Disk
Mode, the next thing you need to do is power down your Macs and connect
them using the appropriate cable. Also, if your target Mac is a MacBook
of some sort, Apple recommends that you plug it up using its AC power
adaptor before booting into Target Disk Mode. Make sure both of your Macs are powered down and connected before you start using Target Disk Mode.
With the Macs powered down and connected, via Thunderbolt or
FireWire, you are ready to boot your target Mac into Target Disk Mode.
To do this, press the power button on your target Mac and then
immediately press and hold the T key on your keyboard.
Within a few seconds, your target Mac will boot up and display a light
grey screen with a floating Thunderbolt/FireWire icon. Hold the T key while powering on your target Mac to boot into Target Disk Mode.
Now that your target Mac is booted into Target Disk Mode, we are
ready to look at three scenarios using Target Disk Mode and how you
should boot your host Mac in each case.
Scenario 1. Using Your Target Mac as an External Drive
Target Disk Mode allows direct file transfers from your target Mac to
your host Mac, as if your target Mac is simply an external hard drive
connected to your host Mac. Using this feature is extremely simple. All
you need to do is power on your host Mac as usual and log in. Once your
user loads and you go to Finder, you will find your target Mac’s
internal drive listed on the side of Finder like it is an external
drive. Accessing a large video file directly from the target Mac's internal drive.
This use of Target Disk Mode could come in extremely handy for anyone
that deals with large files, like video editors for example. Rather
than waiting to transfer dozens of gigabytes of video files to an
external drive, and then waiting again to transfer those files on to
your secondary Mac, you could simply use Target Disk Mode as a direct
connection between your two Macs for a one-step file transfer.
When you are done transferring files, you can simply eject your target Mac like you would any other external drive. Playing back a video from the target Mac's internal drive.
Scenario 2. Booting Your Target Mac’s OS on Your Host Mac’s Hardware
If you boot your host Mac into Startup Manager while your target Mac
is connected in Target Disk Mode, your target Mac’s drive will show up
as a bootable volume on your host Mac.
To boot into Startup Manager, press the power button on your host Mac and then immediately press and hold the Option key (sometimes marked Alt)
on your keyboard. Within a few seconds, your host Mac will boot up and
display all of the bootable volumes on or connected to your computer,
one of which will be your target Mac’s internal drive. Hold the Option key while powering on your host Mac to access the Startup Manager. By holding the Option key while booting the host Mac, we have accessed the Startup Manager.
Select that volume as the OS you want to boot, and a few seconds
later, you will see the user login screen from your target Mac load on
your host Mac. Your host Mac is now successfully running your target
Mac’s OS. Using Target Disk Mode, we have booted the 15" MacBook Pro's
OS on the 13" Macbook Pro. We are greeted with the user login screen.
There are several applications for this use of Target Disk Mode. For
example, an interface component of your MacBook may have suddenly died.
Examples of this would be the screen or the trackpad. Using another
Mac, you could boot the broken Mac’s OS on a fully working Mac and
recover files you were working on, do a system backup before sending off
your Mac for repair.
Scenario 3. Using Target Disk Mode with Migration Assistant
Migration Assistant is a standard Mac OS application that helps
transfer a user’s data from their old PC/Mac to their new Mac. If you
are transferring from an old Mac to a new Mac, Target Disk Mode in
combination with Migration Assistant will be the fastest and simplest
way to transfer your data and settings.
To use Target Disk Mode with Migration Assistant, all you need to do
is power on your host Mac as usual and log in. Once your user loads,
open up the Migration Assistant application, which is found in Applications > Utilities. Target Disk Mode and Migration Assistant.
When the app loads, it will ask you how you want to transfer data. Select From another Mac, PC, Time Machine backup, or other disk and then click Continue.
You will then be asked to enter your admin password, and then given an option on where to transfer data from. Select From a Time Machine backup or other disk.
On the next screen, you will be able to select the internal drive
from your target Mac as the drive to transfer from. You will be able to
customize what exactly will be transferred in the process.
Once you click Continue, Migration Assistant will
begin transferring data from your target Mac to your new host Mac. Once
Migration Assistant is finished, you can eject your target Mac.
Conclusion
In this tutorial, I have shown you how to set up Target Disk Mode and
then use it in three different scenarios. By following these simple
steps to properly boot your target and host Macs for your particular
use, you’ll gain access to some incredibly useful Mac OS X features that
simplify and speed up data transfer between your two Macs.
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