External hard drive corruption - Help!

[JoaoPinheiro]

I need to urgent help. Mac OS X just crashed while I was writing to my external hard drive; I rebooted my mac and the disk is now corrupted. My old partition is no longer mountable, nor can I fix it with Disk Utility.

I get the following error when I try to verify/repair it:

Verify and Repair volume “disk1s2”
Checking Journaled HFS Plus volume.
Invalid node structure
Invalid B-tree node size
Invalid node structure
Invalid B-tree node size
Volume check failed.

Error: Filesystem verify or repair failed.

Screenshots:
http://www.joaopinheiro.org/tmp/error2.png
http://www.joaopinheiro.org/tmp/error1.png

Can anyone please tell me what I might be able to repair the disk?

 

[sickmacdoc]

There is at very least some serious directory corruption going on there beyond the capabilities of DU to fix, so your next step might be to start up in single user mode and use the "fsck" command (either Google or wait for someone to tell you more about that- I use the second solution here myself) or get a copy of Disk Warrior which can normally do a wonderful job of rebuilding a replacement directory when all seems lost. It doesn't work in all cases and really won't be able to do much if the drive is failing physically, but from your description it does not sound like it is.