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- 2000.11.29 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. Apple's SCSI Disk Mode, and it's modernized offspring, FireWire Target Disk Mode, are excellent examples. SCSI Disk ModeSCSI Disk Mode, introduced way back in October 1991 on the
PowerBook 100, allowed you to mount
your PowerBook's hard drive on another Mac using a funny $30 cable
made called 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. 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. 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. Setup of SCSI Disk Mode
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.
FireWire Target Disk ModeApple stopped including SCSI with the 2000 PowerBooks, replacing the SCSI port
with two of Apple's more- 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. When Apple announced its new iBooks last September - which also come with FireWire - it included FireWire Target Disk Mode on them as well. As with its SCSI counterpart, the vast majority of 2000 PowerBook and iBook don't know such a feature exists! Setup of FireWire Target Disk Mode is almost too easy:
Compared to SCSI Disk Mode, FireWire Target Disk Mode requires no rebooting of the host Mac and needs only an easy-to-find FireWire cable (it's half the price of the SCSI Disk Adaptor). FireWire Target Disk Mode is the fastest and easiest way to send files between a new portable Mac and any other Mac with FireWire. For sharing files between PowerBooks, FireWire provides 100 times the bandwidth of IrDA, the bigwig in Windows notebook computer and Palm PDA file sharing. One other nicety is that FireWire Target Disk Mode is hot pluggable, you don't have to plug the two computers together before you start up the "target" PowerBook or iBook. Once the target computer has booted and the FireWire icon is displayed on screen, you can plug it into any FireWire-equipped Mac. When you're done sending files, all you have to do is move the shared hard drive icon to the Trash and unplug the FireWire cable. When you plug it into another computer, it'll mount on the desktop of that Mac! The only big drawback is that the systems that support it in target mode are nowhere near low-end. You can only use it with the 2000 PowerBooks and iBooks, although, unlike SCSI Disk Mode, some desktop systems support it as well! The "Sawtooth" and "Mystic" Power Mac G4s support it, as long as they're using hard drives connected to the built-in ATA controller. And, if you've installed the iMac Firmware 2.4 updater, you can even use it with any slot-loading iMac. However, the G4 Cube, the G4 tower (if using a separate hard disk controller), and any Mac with FireWire added by a PCI or CardBus card, are not supported. Still, if you have a new Mac and need to swap files with other systems that have FireWire, it's a feature that is so intuitive and Mac-like you could use it happily every day. It's fantastic if you want to get into Mac OS X. You could back up your iMac DV SE's hard drive to your sister's new PowerBook to partition it, and do so fast enough that she's not stuck counting sheep waiting to get back on her beloved computer. If you have a computer that was built long before Apple started
including FireWire on its systems, this doesn't apply to you. But
you can certainly use SCSI Disk Mode with older PowerBooks, knowing
that Apple is continuing to innovate the newest incarnation of that
feature, one it barely mentions in its Tech Info Library. Recent Content on Low End Mac
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the SCSI Disk Adaptor.
(Apple changed its name to HD Target Mode starting with the
modern
FireWire ports. So you're in the dark if you wanna drop a huge file
onto a new PowerBook's hard drive at full speed, right?
