Sony z1 keeps un-mounting ext. hard drives...

hello..
I have a very strange problem...
I'm using a sony z1 as a deck to capture some hdv media... well, trying to...
I have just one ext. lacie drive plugged into one firewire port, and the sony z1 plugged into another firewire port. Every time i turn the z1 on, it un-mounts the drive. I've tried every possible combination of firewire set-ups, and every possible combination of turning things on and off... eg- leaving the deck(z1) off whilst booting up the g5 is ok, but when i turn the z1 on the drive un-mounts... or having the z1 switched on before turning on the g5 results in the drive not mounting at all, but if i switch the z1 off, sure enough, the drive mounts.
I've daisy-chained the z1 through the drive, same problem... i have litterally, tried everything... now, the strange thing is, i'm using the same z1, the same edit suite and the same ext. drive that i was using the other day... when i had no problems...
I'm running on fcp v5.1.1 and have not installed any new software... there is a possiblity that one of the guys here might have done a software update that could have caused this, but i'm not sure.
any ideas?
many thanks in advance for your suggestions.
J

Hello David,
i understand what you're saying, but having just one firewire drive and one camera/deck, surely isn't overloading the bus... we usually have 3 terabites of drives daisy-chained to our system, along with the dsr1500ap, and we never have any problems.
I stripped down the system to just the one drive with the previously captured HDV media on it, and just the Z1 acting as the deck, so i might be able to solve it in a process of elimination.
I just spoke to a work collegue, and it turns out that he updated QT from 7.1.2 to 7.1.3 yesterday afternoon, which is where i'm thinking the problem lies... as in QT receipts... but i thought that was an old issue now that we could have moved on from.
But i'm really stumped... the drive un-mounts etc before opening FCP, so it's not the usual camera/deck recogition problem that you'd usually associate with QT receipts problems...
J

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