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Macintosh HD missing after failed catalog btree rebuilding

There is an I/O error in the hard disk in my MacBook Pro running Mountain Lion and as I start it up, a progress bar fills up and then it shuts down on its own. I attempted to recover the files in ...
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How to recover files by original filename without access to beginning of disk/partition

As a result of a dd user error the first Gigabyte was overwritten on a recent Macbook Air and it seems the beginning of all partitions are lost. Except for carving files using photorec or similar is ...
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How to “scan disk” or “repair disk” by booting up in single user mode and scan disk?

I think when we are using the Mac, we can't choose "Repair Disk" in Disk Utilty to repair the current hard drive, as the drive is being used. If "Verify Disk" is used, it only takes about 3 to 5 ...