[ubuntu] Recover data from failed WD hard drive but lost NTFS signature on main partition

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http://ubuntuforums.org – It seems that the hard drive on my windows 7 laptop has failed and I'm not able to boot the computer. When I run diagnostics, I get error codes that lead me to a hard drive failure. I'm trying to run Ubuntu Live CD 12.10 to recover the data from my hard drive and came across an issue. When I type "sudo fdisk -l", I get the following output: ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / (Hardware)