If you're a PC pro who needs to recover files off a Mac that won't boot, you might think to try the old PC trick of removing the problem Mac's hard drive and attaching it to another machine. But, there's an easier way. In this IT Dojo video, I show you how to use Target Disk Mode to access the hard drive of a Mac that won't boot.
What about security?
After watching the video, you may wonder if Target Disk Mode (TDM) grants unfettered access to the data on the target drive, which is an obvious security risk. The answer is "it depends." Accessing a drive through TDM bypasses most security for local accounts and even network accounts. I could find only two exceptions. First, if you configure an Open Firmware Password, the machine will not enter TDM. Second, if you encrypt your home folder using FileVault, you won't be able to access the data without the FileVault password. You'll also have to find the hidden FileVault image using the "Go to Folder" menu option or terminal.
For information on using TDM, setting up an Open Firmware Password, and information aboutFileVault, check out the following articles:
- How to use FireWire target disk mode
- Setting up firmware password protection in Mac OS X
- Mac OS X 10.4 Help: About FileVault
- Mac OS X 10.3, 10.4: FileVault - How to verify or repair a home directory image (cached Google version)
For those of you who prefer text to video, you can go to the video player page for this IT Dojo episode and click "See Full Transcript," or you can also read William Jones' original article, "Boot a sick Mac into Target Disk Mode for troubleshooting," on which this video is based.
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Bill Detwiler has nothing to disclose. He doesn't hold investments in the technology companies he covers.
Bill Detwiler is Managing Editor Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. He was most recently Managing Editor for TechRepublic Pro. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the social research and energy industries. He has bachelor's and master's degrees from the University of Louisville, where he has also lectured on computer crime and crime prevention.