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@IvanFrankie Have tried with FW800 to see if it duplicates the issue? If it does, it will need to be repalced.
@IvanFrankie Is the drive connected via USB or FW800? Can you duplicate the issue from another computer?
@peloquingirl You can purchase a replacement USB cable form any computer electronic store or online retailer
@_AndrewSteele You can try Data Rescue 3 to try and recover the data from the damaged partition - Data Rescue PC for Windows