Cannot resize external disk

I'm trying to resize my 400Gb external LaCie FireWire drive in Disk Utility but I get the following error:
"Partition Failed with the error: Filesystem resize support required, such as HFS+ with Journaling enabled."
However, the current partition that takes up the entire drive is listed as being "Format: Mac OS Extended (Journaled)".
I repaired the volume just to be on the safe side and during the process it even says "Checking Journaled HFS Plus volume" so why can't I resize this disk?
Note, I can't repartition the drive since I have no other location to put the data on it, hence my desire to resize. Any advice would be greatly appreciated!

Hi
New information...
BlackBook:~ MacCheetah3$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUIDpartitionscheme *149.1 Gi disk0
1: EFI 200.0 Mi disk0s1
2: Apple_HFS MacBook 108.0 Gi disk0s2
3: Microsoft Basic Data WINXP 40.7 Gi disk0s3
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Applepartitionscheme *465.8 Gi disk2
1: Applepartitionmap 31.5 Ki disk2s1
2: Apple_Driver43 28.0 Ki disk2s2
3: Apple_Driver43 28.0 Ki disk2s3
4: AppleDriverATA 28.0 Ki disk2s4
5: AppleDriverATA 28.0 Ki disk2s5
6: Apple_FWDriver 256.0 Ki disk2s6
7: AppleDriverIOKit 256.0 Ki disk2s7
8: Apple_Patches 256.0 Ki disk2s8
9: Apple_HFS Videos & Misc 285.6 Gi disk2s10
10: Apple_HFS MacBook Backup 99.9 Gi disk2s12
BlackBook:~ MacCheetah3$ diskutil resizeVolume disk2s12 limits
Error obtaining resizing information
Resizing encountered error on disk disk2s12 MacBook Backup: Unrecognized filesystem (-9958)
This help any?
I have a thread over at Macworld magazine's forum with some screen shots...
• http://forums.macworld.com/thread/99012#
P.S. Sorry that I don't know how to have the forums hold the proper layout of the original data, it's a bit cramped now.

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