Macbook Pro 1st gen Unibody Firewire 800 problem

Recently I notice when I hook up a hard drive to my firewire 800 port and daisy chain another drive my mac pops up an error stating that the drives were ejected incorrectly.  I wasn't trying to eject a drive just daisy chain an additional drive.  Is there something wrong with my firewire port?  I already tried using different cables.   Anybody else experience this?

I've discovered what I think is the underlying reason for many of the folks reporting similar problems to this thread.
By the way, I bet that I can predict the GUIDs of the drives/docks/cases you're having trouble with!
I bet that if you look in System Profiler, you'll find the GUID 0x30E002E0454647 !
What are the odds?  I shouldn't be able to predict them; theyr'e supposed to be unique, after all, but google that number and you'll see that a great many devices all use that GUID.  Mac OS seems to rely on them to be unique, and has fits when they aren't.
I'm trying to figure out how to resolve the problem:
There are tricks to changing a Time Machine backup's record of the GUID of the drive it backed up, but that's not useful. 
I think I may find myself booting into another OS in order to run a real partition editor and change the GUIDs to be truly Unique.  Maybe I'll install rEFIt and gParted Live on a Hard Disk partition. 
Maybe I'll run the Windows software from Other World Computing linked to from this thread: http://mjtsai.com/blog/2009/03/02/newertech-voyager-q/
This had been causing me no end of trouble with some Cavalry CACE3701TO external firewire hard disk drives I was trying to daisy-chain.  Hoping for some relief from Cavalry...

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