What Does Target Disk Mode (TDM) Mean?
Target Disk Mode (TDM) is a special boot utility available only for Macintosh computers. Any Macintosh computer booted in Target Disk Mode can be connected to the port of any other computer (Mac or PC), with the Macintosh computer acting as an external device.
Techopedia Explains Target Disk Mode (TDM)
Target Disk Mode can help users in sharing files between two computers which are connected by FireWire, Thunderbolt, USB or Ethernet ports. When the “T” key is is pressed during power-up of a Macintosh that supports Target Disk Mode, the operating system does not boot; rather, the firmware in the device enables the device to act as an external mass storage device which can be connected to other devices.
