External Hard Drive suddenly stopped being recognized

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http://askubuntu.com – I had this drive [a Samsung S2 1.0TB] working well in Ubuntu 11.04 and after installing 11.10 it was still fine for the first week until I got my other flash drive to format. After formatting it through Disk Utility I was comparing the status of both the flash drive and the Samsung 1TB that was being displayed on the screen of Disk Utility. Both devices were mounted and working properly. Then I attempted to correct a booting error that was annoying me every time I started Ubuntu. As I would keep the Samsung Hard Drive jacked at all times, when I booted the computer, a screen would show (HowTos)