Partition wiped out possibly due to the partition table changed by Windows?

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http://unix.stackexchange.com – When the data loss problem occurred: My Lenovo laptop has both Windows 7 and Ubuntu 12.04. There are two ntfs partitions shared between the two OSes: one for Windows 7 installation ,and the other for personal data files. Earlier today, when I was in Windows 7, I restarted the computer into Ubuntu. The ntfs data partition shared between Windows 7 and Ubuntu 12.04 was not able to automatically mounted, which is unlike usual, while The ntfs Windows installation partition was mounted automatically just like usual. Then I restarted the computer back into Windows 7, and the ntfs data partition ha (HowTos)