AppleCare is not only worthless, but wrong

Just had to do a hard reset of the PowerBook.

What happened? You guessed it, another Firewire issue.

Tried to unmount a partition on an external drive which kept stubbornly refusing to unmount, claiming that it was still in use after I'd shut down the various applications which might possibly have been referencing a file or directory there.

No luck. I had a compile and other stuff going which I didn't want to interrupt, so I let it power down.

But it kept powering up every time I downloaded a new dependency, and I kept trying to unmount it every time afterward. It still refused.

Finally, I tried one last time, and it locked up the PowerBook entirely. Spinning beach ball of death, frozen Terminal output, absolutely no response for quite some time. I had to force a shutdown, and lost my work.

This happened with an entirely different drive, with an entirely different cable, leading to an entirely different enclosure.

Maybe it's vaguely possible that I have two entire sets of dud equipment, but I've never had any problems using either with the iMac, and the only thing these incidents keep having in common is the PowerBook.

So not only did I get shafted by AppleCare on the extended coverage I bought, I also had to pay extra for what's probably a very lazily done and outright wrong diagnosis.