FireWire: Hot Swapping Isn't Always a Good Idea
Charles Moore - 2003.02.24 - Tip Jar
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One of the highly touted advantages of FireWire is hot pluggability. Unlike cranky old SCSI, you are supposed to be able to plug in or unplug FireWire devices to your heart's content with your Mac powered up - or not?
While I have occasionally taken chances (or been obliged to when something locked up) and hot-plugged/unplugged SCSI cables over the past decade, I've never experienced any notable problems from doing so. Consequently, I find it highly ironic that I think I have just experienced my first-ever hot-plugging induced hardware failure - and it's with a FireWire drive.
While my daughter was home from university (for what used to be called "March break") last week, she asked me to burn a CD for her. My usual computer of choice for CD-burning is the good old Umax S900, so I started it up, and, while it was still booting, I (being in a hurry as usual) plugged in the FireWire cable for the Que Fire! CD burner into the Macally PCI FireWire adapter in the S900 - and OS 9.1 immediately crashed to the MacsBug debugger, which reported a bus error. Rats!
I tried rebooting, and the same thing happened again, although I discovered that the Umax would resume booting if I typed "es" in the MacsBug command line field and then hit Return. But while my Desktop icons appeared, the rest of the Finder didn't - no menu bar and no Desktop picture. Very peculiar. However, I could open my hard drive window and get at the System Folder.
I tried rebooting from an OS 8.1 Disk Tools floppy, and the Finder appeared normally. I ran Disk First Aid, which affirmed that all was well on the hard drive. You can't do much when booted from an OS 8.1 floppy disk, so I opened Startup Disk and selected the hard drive partition with OS 9.0 on it. When I rebooted, it again crashed to the debugger when the extensions started to load. I then tried booting from an OS 9.0 install CD, and that worked fine.
Okay, I also have OS 8.1 installed on the hard drive's third partition, so I tried it, and the machine booted up normally. I ran Disk Warrior on all three partitions to make sure that there were no directory corruption issues, although at this point I thought that was a very long shot. While Disk Warrior did find a few minor problems that Disk First Aid had missed, there was nothing that would explain the anomalous behavior.
However, OS 8.1, which was working happily, does not support FireWire, while OS 9.0 and OS 9.1 do, and that observation, combined with the fact that the problem first manifested at the moment when I was plugging in a FireWire drive, seemed to narrow the scope of probability.
I opened the OS 9.1 Extensions folder, moved the FireWire extensions to the disabled folder, and rebooted. The S900 started up nicely, with the Finder and the menu bar showing up as they should.
Just to eliminate another remote possibility, I installed a fresh set of FireWire extensions and rebooted again. It once more crashed to the debugger as soon as the extensions started to load.
In summary, my best guess at this point is that plugging in the CD burner (which was powered up at the time with its external power supply) somehow damaged the FireWire port and/or PCI card circuitry, something that I had thought was not supposed to be an issue with FireWire.
If the PCI card really is fried, it's not a major financial
catastrophe - you can pick up 
Macally
PCI FireWire adapters for about twenty dollars these days, but it is
a pain, although not nearly as much of one as being experienced by a
sizable cohort of titanium PowerBook owners who are reporting
FireWire port failures that seem to be related to plugging in the
iPod, of all things.
The provisional moral of this tale: Be cautious about FireWire connections, and it's probably prudent to at least wait until the machine is fully booted before connecting or disconnecting a FireWire device.
TiBook owners might be well advised to be extra wary and put the machine to sleep, although I don't know if that would really prevent the problem from occurring
USB 2 anyone?
Charles Moore has been a freelance journalist since 1987 and writing for Mac websites since May 1998. His The Road Warrior column is a regular feature on MacOpinion, and he is a news editor and columnist at Applelinks.com.
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