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Le Nguyen The Dat

~ Data Science & Engineering

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$ diskutil list # To list all your connected HDD
$ sudo fsck_hfs -rf /dev/disk2s99 # To repair your disk2s99,
                                  # this might take a while.
                                  # **USE AS YOUR OWN RISK.**
** /dev/rdisk2s2
   Executing fsck_hfs (version hfs-285).
** Checking Journaled HFS Plus volume.
   The volume name is Time Machine at Work
** Checking extents overflow file.
** Checking catalog file.
** Rebuilding catalog B-tree.
** Rechecking volume.
** Checking Journaled HFS Plus volume.

Note: If you encounter Resource busy error, try killing your current Disk Utility’s fsck_hfs process from Activity Monitor or your Terminal - 60% of the time, it works every time.

Update: When this also failed, you probably want to try out DiskWarrior. It actually worked for me: