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Possibile problema hardware oppure un tentativo con DiskWarrior. Però non hai garanzie, cito dal supporto Alsoft (può essere utile anche per altri utenti):
Product
DiskWarrior
Question
Is DiskWarrior capable of repairing an "Invalid Node Structure" as reported by the Apple Disk Utility?
Answer
Yes, DiskWarrior can repair a "Invalid Node Structure" error.
Directory nodes contain the directory entries for your files and folders. Damage to a node renders its entire contents unusable. It also makes the nodes that are linked to by the damaged node inaccessible. That's because the links to the nodes can no longer be followed. Disk Utility reports this type of damage as an "invalid node structure."
A disk with an invalid node structure can exhibit several symptoms. Depending upon which node is affected, it could be that the disk will not appear on the desktop. Alternatively, it could be that just some of the files on the disk will be in inaccessible nodes. If the disk is your startup disk it's also possible that it will no longer start up because the necessary Mac OS files are in an inaccessible node.
Fixing a damaged node is a tricky operation. Depending upon the brilliance of your disk repair utility you might be able to repair the damaged node and even recover the file and folder entries it contains. Of course if the damage is bad enough there will be nothing in the node left to recover but the right utility can still put the directory back into working order.
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