New answers tagged ext3
You can use TestDisk, there is an Step by Step tutorial. I never used it with a 3TB disk, therefore I cannot ensure you speed. fsck is simple and straightforward, theoretically you can recover a file system with a few command lines, but I never used it.
Okay, this message is very old, but has no answer. I just had the same problem. The issue for me was that over NFS the root user has no special ability to read & write to a file. One thing you can do is change the owner of the file to root, or you can put it in the root group and make it group writable.
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