The disk is not readable

Hi everyone, I store a lot of my stuff on my external hard drive. However this morning it wouldn't mount. Instead I got this message
The same message pops up if I try connecting it to other computers. If i open Disk Utility it looks like this
If anyone knows what I need to do, please tell me. I have a lot of very important files on it that are not backed up, since I recently lost my back up disk.
Thank you, I'm desperate, Sebastian
Mac Book Pro   Mac OS X (10.4.9)  

DiskWarrior usually has a better chance of fixing such problems. But no guarantee, and it will cost you about $80 to find out. When DW works, it's absolute magic, because it just fixes things back to the way they were. And for some reason, it is able to fix things that Apple's free DiskUtility can't:
http://www.alsoft.com/DiskWarrior/
Data Rescue II from ProSoft has a good chance of recovering important files if the disk can't be repaired:
http://www.prosofteng.com/
You can download a demo version that can show you what files can be recovered. Then pay and register to actually complete the recovery.
You have to have room on another hard disk to put the files you recover with Data Rescue.

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