If your Mac has a firmware password and you want to boot into Target Disk Mode you can’t just hold down “T” while the computer boots. It won’t prompt for a password or anything. To get around this I’ve been booting into systems, removing the firmware password, then booting into target disk mode. Well there is a much simpler way to do this.
- Hold “Option” while computer is booting
- Enter firmware password when prompted
- When you see the local hard drive listed hit “t”
- Congrats, your now in target disk mode.