A Guide to Understanding Target Disk Mode

What is Target Disk Mode?

Target Disk Mode is a feature that allows you to use your Mac as an external hard drive. It’s useful for troubleshooting but different from transferring files between two Macs. Unfortunately, Target Disk Mode only works with FireWire and Thunderbolt connections, so if you have a USB 3 port on your Mac (or older USB 2), this feature won’t work for you!

How Do You Enter Target Disk Mode?

To enter Target Disk Mode on your Mac, you must ensure that the target computer is turned off. If you’re using a USB or FireWire cable to connect your Mac to another system, turn on both systems and wait for them to be recognized by each other. Next, hold down T while turning on the target computer’s power button until it boots into Target Disk Mode (you may see a message saying, “Target disk mode is not supported”).

Target Disk Mode is not working for any reason (for example: if there are no USB devices connected), try restarting again after removing all non-essential peripherals from both computers before attempting again.

When the target computer is in Target Disk Mode, you can connect it to another system via FireWire or USB. The other computer should recognize a new drive available for use and ask if you want to initialize it as an external storage device.

When Should You Use Target Disk Mode?

Target Disk Mode is most commonly used when you want to transfer files between two Macs. For example, if you’re using a Mac as an external hard drive, then Target Disk Mode will be necessary for accessing the file system on your external hard drive. Likewise, if you want another Mac (or Windows PC) to boot from your internal hard drive and run from there, you’ll need Target Disk Mode.

How can You Use Target Disk Mode?

Disk utility is a Mac utility that allows you to format, repair, and erase disks. You can find it in the Utilities folder of your Applications folder.

To access disk utility:

  • Open Finder (in OS X 10.7 or earlier) or File Explorer (in OS X 10.8 or later).
  • Select Applications from the side panel menu bar on your computer screen and then select Utilities from this pop-up window that appears next to the All Programs list under Computer heading; if you don’t see this option in the Applications list, then click on Other, which will open up its Settings button at the right side of toolbar so that you can access all other applications installed on your system besides just those pre-installed by Apple itself like Safari Web browser which comes bundled with OS X itself; also check out what other programs are installed on PC using the same method mentioned above for accessing Program Manager window where one can view files stored within specific folders without actually opening them up manually!

Common problems you might experience with Target Disk Mode.

  • If Target Disk Mode does not support your Mac, you can’t use it with this feature.
  • Your computer may not be updated with the latest software and/or firmware updates. For example, if your machine has an older version of OS X or iOS, it will not work correctly in Target Disk Mode. To check which version of OS X or iOS you’re running on your computer: Open System Preferences > Security & Privacy > Privacy tab; click the General button; choose About This Mac from the drop-down menu that appears; look towards the bottom of this window where there will be a section called “Software Update” listing any available updates available for installation (if there are any). You should also ensure that all relevant system components have been updated before attempting this operation on a non-supported device.

Troubleshooting Target Disk Mode often requires a little knowledge about how Macs work and the tools available for troubleshooting.

You can use Terminal or the Disk Utility app to see what the disk is called, whether it has enough space on it, if there are any errors in the disk structure (such as bad sectors), and other things. These two tools are potent for diagnosing problems like this because they allow you to see everything about your computer’s hard drive in one place.

The first thing we should do when trying to troubleshoot Target Disk Mode issues is look through our Mac’s logs by clicking on “Logs > My Computer” at the bottom left corner of our screen while holding down the shift key (if using Windows PC) or Control key (if using Mac). This will open up a window from which we can search through all sorts of information about our system—from crashes caused by faulty hardware components such as RAM modules or hard drives that have read/write errors all the way up through processes running on startup time during booting up with no error messages whatsoever!


If you are using a Mac, chances are good that you know about Target Disk Mode. However, there still needs to be more clarity about what this feature does and how to use it. This guide has helped clear up some confusion and give you the tools to troubleshoot when things don’t go as planned with target disk mode.

For more valuable information visit this website

Related Articles