I was trying to resize an external ntfs hard drive, so that I could make room at the front of the disk for a swap partition. At the end of the process gparted encountered an error. It couldn't see my disk again until I rebooted the system. Now, when it looks at the hard drive, it sees it as one big unpartitioned hard drive.
I'm pretty sure all the data is still there, uncorrupted. I just can't access it. How can I fix this?