[ubuntu] External hd not mounting

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http://ubuntuforums.org – GUYS,I AM NEW TO UBUNTU.....I HAVE A EXTERNAL HD.....IT USED TO WORK PERFECTLY IN UBUNTU UNTIL ONE DAY I HAD TO EXIT IT URGENTLY...AFTER THAT IT IS NT MOUNTING....IT IS WORKIN =G IN WINDOWS...BUT I NEED TO USE IT IN UBUNTU SO BADLY......WHEN IT IS PLUGGED FOLLOWING MESSGAE IS SHOWN....AM NEW TO UBUNTU....URGENT HELP NEEDED. Error mounting: mount exited with exit code 13: $MFTMirr does not match $MFT (record 0). Failed to mount '/dev/sdc1': Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on (Hardware)