Ext. HD error - "The disk you inserted was not readable by this computer"

Hello world.
I'm really stressed here.
Whenever I insert my FireWire WD external HD, the "The disk you inserted was not readable by this computer" pops up, followed by three options; Ignore, Eject, Initiate.
- DiskUtility doesn't work (Repair buttons are grayed out).
- I managed to get some partition info through TestDisk. There is no option of repairing the partition table though.
- Should I try DiskWarrior? How do I use it?

This situation happened to me tonight, but instead of firewire, I was using esata. I bought disk warrior and it actually worked perfectly.
Even though Disk Warrior was $100, it was definitely worth it.

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    I have spent hours trying to find a solution to this problem, but alas - nothing really useful came up. Therefore I now turn to you, Discussions - you're my only hope!
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    Message was edited by: Nilfisken

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