Comment 3 for bug 730225

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bsfmig (bigslowfat) wrote : Re: grub-install trashes ntfs partition when sector 32 of the hard disk is occupied by Adobe FlexNet

NTFS maintains two copies of MFT, so recovering the first sector of the partition is enough to let it finish bootstrapping and self-recovery through chdksk.exe "fsck" utility.
Users already encountered with the issue can boot up their computer with a Windows 7 installation DVD, launch Command Prompt, and run chkdsk c: /f to have the partition fixed.
This will NOT overwrite the MBR so you can still boot into Ubuntu, and running update-grub will also put Windows back into the Grub menu.

ps.dd is dangerous to normal users and since not only one sector is trashed it's still recommended to perform a thorough check using tools released by Microsoft itself.