[ubuntu] Problems with seemingly lost ext4 partition on external USB drive

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http://ubuntuforums.org – Hi all - I recently made the switch from Windows 7 to Ubuntu with a Cinnamon shell, I copied files off my NTFS partitioned 250GB USB drive onto my desktop partition, used gparted to partition the USB drive as EXT4, copied files from desktop back onto it. All seemed fine and well until I rebooted and suddenly gparted is showing the drive as not being partitioned.... I also deleted the files before this from my desktop partition thinking things were fine. I have not done anything to the USB drive now, bar check it on two different machines which say the same thing. I have ran testdisk on (Hardware)