You may be better off attempting to run some HFS+ recovery tool to try to save everything that can be accessed without errors first. You will need a utility that understands the HFS+ file format to try to repair this. All of the following operations should only be done on the new drive image, not the original.The B-Tree error you are seeing has to do with how the directory and file metadata is stored on the drive. You will need another drive of the same (or larger) size in order to do this. You can use the dd utility for this - check your man pages to see the exact format of the command since I don't know if or how Apple has modified it for OS X. Your first step should be to unmount the drive and mount it again in read-only mode. Any help you can give me would be greatly appreciated. I have also been considering buying DiskWarrior because maybe I need my directory rebuilt inside the drive (Hopefully I'm getting this terminology correct). I'm not very experienced with Terminal but I'd be happy to paste some code in to restore permissions if you think it'd work. Methods I've been wanting to try would be to restore the permissions on the drive. I'm sure not all of that is indexing space. You should know that when I select the drive in Disk Utility it does seem like my data is there. Other times it says read and write so I'm confused. There may be a problem with permissions, for example when I click Get Info it sometimes, and I emphasize 'sometimes', shows that I can only read, not write. I obviously don't want to lose the images so I didn't format it, and i can't back it up if I cant copy over the files to another drive (because I can't even see them). It then immediately told me to backup and format the drive. I tried Verifying and Repairing in Disk Utility but both came up with an error about the B-Tree node being invalid in size or something. When i open the external drive in Finder I can see some folders but all of these folders have invisible contents, as in, when I click to open the folders the drive opens it but then starts to whirr and make sound and nothing shows up even though there would normally be around 6000 photos organised by date into separate date folders. I also have a WD 3TB external hard drive with Firewire and USB. I have a MacBook Pro with Lion installed version 10.7.5.
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