Start up the target Mac and hold down the “T” key.
Connect an ordinary 6-pin to 6-pin FireWire cable to a FireWire port on both computers. Shut down the target Mac, leaving the host computer running. Setup of FireWire Target Disk Mode is almost too easy: As with its SCSI counterpart, the vast majority of 2000 PowerBook and iBook don’t know such a feature exists! When Apple announced its new iBooks last September – which also come with FireWire – it included FireWire Target Disk Mode on them as well. Of course not! Apple cleverly designed a new FireWire-based technology, called FireWire Target Disk Mode, which lets you connect your new PowerBook to another FireWire-equipped Mac. So you’re in the dark if you wanna drop a huge file onto a new PowerBook’s hard drive at full speed, right? Note that the PowerBook 140, 145, 145b, 150, and 170 do not support SCSI Disk Mode.Īpple stopped including SCSI with the 2000 PowerBooks, replacing the SCSI port with two of Apple’s more-modern FireWire ports. Okay, so it’s not true plug-and-play ease, but it’s a really convenient feature if you have an older PowerBook and another Mac with SCSI and can get your hands on the hard-to-find SCSI Disk Adaptors. You can use it like you would use an external drive with little speed loss over using the PowerBook’s drive in the PowerBook. The PowerBook’s hard drive icon should mount on the desktop of the host Mac. Turn on any other SCSI devices if the PowerBook is not the only device on the SCSI chain. A SCSI icon and ID number should appear on the screen. Connect your SCSI Disk Adaptor between the target PowerBook and the host Mac. I’ll refer to the Mac acting as an external hard drive as the “target” Mac, like Apple does, and the connecting computer as the “host” Mac. Also, if your PowerBook has no ethernet port, you’d need to buy either an expensive PC Card ethernet adaptor or a speed-squashing LocalTalk-to-Ethernet bridge. While today you can do the same thing with File Sharing and a $15 ethernet crossover cable, on most models you’re limited to the relatively poor bandwidth of 10 megabit per second ethernet. For consistency I’ll refer to them both as SCSI Disk Mode.) 
(Apple changed its name to HD Target Mode starting with the 5300 and 190, since they used IDE hard drives, but it works the same way. SCSI Disk Mode, introduced way back in October 1991 on the PowerBook 100, allows you to mount your PowerBook’s hard drive on another Mac using a funny $30 cable made called the SCSI Disk Adaptor. Apple’s SCSI Disk Mode and it’s modernized offspring, FireWire Target Disk Mode, are excellent examples. Our Fair Computer Company has released some quirky yet useful features in its computer systems and OS, and then advertised them very little – if at all.
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