[ubuntu] External HDD not mounting

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http://ubuntuforums.org – i have an external Seagate SATA 320 Gb HDD attached to my pc. it has two partitions. two days back somehow one partition disappeared and the pc is not displaying the contents of it both in ubuntu and windows. i had important data on that. windows partition manager is detecting the partition but while trying to explore the partition, it is showing that the drive is corrupted. i got this screen when trying to open the same in ubuntu help me please to get the data back. thanks (Hardware)