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The user has the option at boot time to put the computer into a mode of operation called Target Disk Mode (TDM). This mode is similar to SCSI Disk mode on a PowerBook computer equipped with a SCSI port, except it uses a FireWire cable instead of a special SCSI cable.
When the iBook computer is in Target Disk Mode and connected to another Macintosh computer by a FireWire cable, the iBook operates like a FireWire mass storage device with the SBP-2 (Serial Bus Protocol) standard. Target Disk Mode has two primary uses:
The iBook can operate in Target Disk Mode as long as the other computer has a FireWire port and the FireWire 2.3 or newer driver.
To put the iBook into Target Disk mode, you restart the computer and holds down the T key until the FireWire icon appears on the display. You then connect a FireWire cable from the iBook to the other computer. When the other computer completes the FireWire connection, a TDM icon appears on its display.
If you disconnect the FireWire cable or turn off the iBook while in Target Disk Mode, an alert appears on the other computer asking you to reconnect the TDM volume.
To take the iBook out of Target Disk Mode, you drag the TDM icon on the other computer to the trash, then press the power button on the iBook.
For more information about Target Disk Mode, see the section "Target Mode" in Technote 1189, The Monster Disk Driver Technote.