Upgraded to 10.4.9 on MBP 15", now, I can't mount external hard disk!

Hi all,
I have a LaCie 500GB drive that I've been using perfectly since I've gotten it, but alas, I upgraded to 10.4.9 and it no longer mounts either by it's USB interface or by its Firewire interface.
My machine is a MBP 15" (2.16 GHz, 2 GB Ram), which works perfectly in all other respects and is now running 10.4.9.
The symptoms are that when I plug it in, I usually get the message, "The disk you inserted was not readable by this computer" with the options "Initialize...", "Ignore", and "Eject". So far, I haven't pressed any buttons except Ignore or Eject. Sometimes, I do not get this message, but it still doesn't mount, it just silently does nothing.
So, after pressing "Ignore", I've opened Disk Utility and had a look. The physical drive appears and there is one volume named "disk2s6" which for all purposes is probably my normal, logical volume (partition). However, last time it mounted on this machine, it was named "Archive". This logical volume is grey and will not mount no matter how many times I press the "Mount" button. It just does nothing.
OK, so, while I'm in Disk Utility, I ran Verify Disk and, after the normal routine, it comes back with "No Repairs Necessary". I've also tried "Repair Disk" and this comes back "No repairs were necessary", again after the full, normal processing of the various things.
I also performed a Fix Permissions on my startup-volume, but this didn't help either.
Next test was to mount the disk on my MacMini (PPC) instead, also running 10.4.9. It mounts perfectly and it properly comes up with the name "Archive" as expected.
I've then tried to mount other devices on my MBP including a USB memory key, and another external Firewire drive. These both mount perfectly on my MBP.
While I was at this, I've also tried new USB and Firewire cables, this didn't affect my results in the least.
I've finally verified that there is nothing in /Volumes out of the ordinary that might prevent it from mounting by doing a "sudo ls -la" whilst in /Volumes/. There's not a thing that would affect the mount-point.
I then disabled my folder actions that I've been running on the directory /Volumes *I had an action used to backup my USB key). Unfortunately, I still have the same issue.
Finally, I downloaded the Combo 10.4.9 installer, booted into Safe Mode (to trigger an automatic fsck), then rebooted and installed the 10.4.9 Combo installer, in case there was some weirdness in the Software Update upgrade to 10.4.9.
What stone have I left unturned? Why won't this drive mount, but it works perfectly elsewhere? I want to get back to using Aperture on my MBP and my entire photo Library is on this disk (well, and backed up on another external drive, but it lives normally on my MBP).
MBP 15" 2.16GHz + LaCie 500GB Ext Firewire drive Mac OS X (10.4)
  Mac OS X (10.4)  

Here's some additional info...
When executing a manual mount: I get this:
sudo mount -v /dev/disk1s6 /Volumes/Archive
/dev/disk1s6 on /Volumes/Archive: Incorrect super block.
During a normal plug-in-the-disk-and-expect-it-to-mount-automatically, this is what diskarbitrationd reports:
22:45:40 iokit [0] -> diskarbitrationd [41]
22:45:40 created disk, id = /dev/disk1.
22:45:40 created disk, id = /dev/disk1s3.
22:45:40 created disk, id = /dev/disk1s4.
22:45:40 created disk, id = /dev/disk1s6.
22:45:40 created disk, id = /dev/disk1s2.
22:45:40 created disk, id = /dev/disk1s1.
22:45:40
22:45:40 diskarbitrationd [41] -> diskarbitrationd [41]
22:45:40 probed disk, id = /dev/disk1s6, with hfs, ongoing.
22:45:40
22:45:40 diskarbitrationd [41] -> SystemUIServer [289]:13363
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s1.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s2.
22:45:40 dispatched callback queue.
22:45:40
22:45:40 SystemUIServer [289]:13363 -> diskarbitrationd [41]
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s1.
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s2.
22:45:40
22:45:40 diskarbitrationd [41] -> diskarbitrationd [41]
22:45:40 probed disk, id = /dev/disk1s6, with hfs, failure.
22:45:40 probed disk, id = /dev/disk1s6, no match.
22:45:40
22:45:40 diskarbitrationd [41] -> SystemUIServer [289]:13363
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s6.
22:45:40 dispatched callback queue.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s4.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s3.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1.
22:45:40
22:45:40 SystemUIServer [289]:13363 -> diskarbitrationd [41]
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s6.
22:45:40
Mac OS X (10.4)
Mac OS X (10.4)

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