Problem with an external Firewire HD

Hi
Up until yesterday, my mini was booting from my external HD (in a firewire enclosure). Suddenly, it started acting sluggish. I rebooted the mini and it couldn't find the Firewire HD. I messed a little with different booting options and finally unplugged the Firewire HD and hooked it to my Windows box. It recognised it as a HD but couldn't read anything on it, probably because it was not FAT32 or NTSF formatted. I hooked it again to the mac and VOILA, there it was again and I could even boot from it.
Same problem today except that this time I could boot from it. I tried analysing it or repairing it using the disk utility ( both from the installation DVD or from the internal mini HD) but all I got was some sort of "Node structure error".
I then tried to erase the drive using the disk utility. No luck, once again and then, no more Firewire HD. Whatever I do, no matter what I have tried, it's as if the **** thing has completely disapeared.
I was using my mini internal HD as a back up drive and I have a fresh back up (3 days old) so it's not catastrophic but I sure would like to have my Firewire disk back, as it's much faster than my internal Seagate 4200 HD.
I would appreciate your comments on this, please

The problem is that you need to repair the "node structure error". If the included disk utility cannot repair it then you will need to use either Disk Warrior or Tech Tool Pro to do it. Until you get rid of that error you are going to have problems.
From what I have read Disk Warrior is the best solution to this problem.
There are some posts about it here:
http://forums.macnn.com/archive/index.php/t-149925.html

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Hardware Overview:
Model Name:          Mac Pro
Model Identifier:          MacPro1,1
Processor Name:          Dual-Core Intel Xeon
Processor Speed:          2,66 GHz
Number of Processors:          2
Total Number of Cores:          4
L2 Cache (per Processor):          4 MB
Memory:          6 GB
Bus Speed:          1,33 GHz
Boot ROM Version:          MP11.005D.B00
SMC Version (system):          1.7f10
Serial Number (system):          CK7XXXXXXGP
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Kernel Version:          Darwin 11.4.2
Boot Volume:          Macintosh HD(2)
Boot Mode:          Normal
Computer Name:          Mac Pro van Juko de Vries
User Name:          Juko de Vries (jukodevries)
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Message was edited by: bollo.sh

Hello,
This is something I have experience with. If you want to you can go here to see my full set-up.
www.KenosisStudios.com
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