I have my entire final university project on a pretty much brand new 1.5TB WD hard drive. I plugged it in today into my iMac, and received an error saying "The disk you inserted was not readable by this computer." and I got the same on my MacBook Pro. I pressed 'Initialize' and 'Verified' and it says: 'Invalid B-tree node size' 'This volume could not be verified completely' and 'Error: This disk needs to be repaired.' So I click 'Repair' And it says: Volume repair complete. Updating boot support partitions for the volume required. Error: Disk Utility can't repair this disk.. disk, and restore your backed-up files. I'm so worried, and I have no idea what to do. I will pay anything to get these files back. They're months of hard work.