I've had firewire external drive problems in the past and the cause was 
the chipsets used in the case.

JT



tonycd wrote:

> Pardon me for quasi-hijacking this thread, but I just ran into nearly
> the same exact problem.
> 
> Only worse: my external FireWire drive isn't seen at all. (3
> partitions: a Panther, a Tiger and a Leopard.) Worked last time. This
> time, none of the three show up anywhere. Not on the desktop, not in
> Disk Utility, not even in Disk Warrior. The physical disk sounds like
> it's running normally.
> 
> Uh-oh.
> 
>    --Tony
> 
> 
> On Feb 28, 7:55 pm, "Wallace Adrian D'Alessio"
> <[email protected]> wrote:
> 
>>On Sat, Feb 28, 2009 at 8:39 PM, Ken W <[email protected]> wrote:
>>
>>>Hi,
>>
>>>I am running a PowerMac G4 dual 450 with OS X 10.3.9.  I have 2 external
>>>firewire hard drives, a LaCie 80 GB and a LaCie 750 GB.  The 750 has 3
>>>partitions.  Everything was working great, but I powered off my computer
>>>today and now when I rebooted the 80 GB is unmounted, and 2 of the 3
>>>partitions on the 750 are unmounted.  Disk Utility can see these unmounted
>>>drives/ partitions, but can not mount them.
>>
>>>What the heck?  I am not that technical with this kind of stuff.
>>
>>>__________________________________________________
>>
>>What file system were they formatted in?
>>
>>Do you shut it down regularly with no similar problem?
>>
>>Have you mounted them to any other machines recently?
>>
>>Have you installed any new software or updates recently that may have files
>>in startup or shutdown folders?
> 

> 
> 


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