How to save my data in external disk

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http://askubuntu.com – My hard drive is not mounting and I am not able to access any file. It gives the following error message. Error mounting: mount exited with exit code 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read NTFS $Bitmap: Input/output error NTFS is either inconsistent (HowTos)