Disk Utility is giving me an "Invalid Node Structure" message and saying that it cant repair the disk and i have to do a complete backup of my data. Now the irony is that the disk giving this message happens to be my only backup disk that has lots of data that I would rather not lose to a reformat. Is there any way to fix this? [EDIT] I did another repair and it is now giving me Invalid Record Count, Invalid Sibling Link and Invalid Node Structure. Oh God.