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Message: <blockquote data-quote="anakinfett" data-source="post: 1643952" data-attributes="member: 345479">Hi allI have an external WD hard drive (500GB, its quite old, a big one) that has stopped functioning properly. I have a lot of important data on it so a reformat is not an option until I have recovered the files. Basically now when I plug it in a dialog box comes up that says: MAC OS X can't repair the diskYou can still open or copy files on the disk, but you can't save changes to files on the disk. Back up the disk and reformat it as soon as you can. It mounts, and it displays the root folders but when opening them there's nothing inside. Also, I cant copy the folders onto my internal HD. It's weird though, if I do "get info" on the failing disk it says that there are 64GB left, which I hope means that the data is still there and theres a directory issue or something else. I have tried DiskWarrior and it has offered me to rebuild the directory but it also said that some files may be lost. That's the case if I check the preview disk that it shows me: nearly all folders and files are missing (some appear, but thousands dont). Therefore I havent gone ahead and rebuilt it. Disk Utility is also no good. Can anyone help me recover this data or fix the disk? Let me know if you need any other details. Again I must repeat that reformat is not an option, I need to recover the files. By the way, I have OS 10.8.5 on a late 2008 MBP.  Thanks already in advance.</blockquote>