Can't see my external hard drive?

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http://askubuntu.com – Usually on a windows computer, you would plug-in the external harddrive and it would show up on the "My computer" or something would popup saying you want to few the files inside of this. But when I do this in my ubuntu computer it doesn't show up or anything. I tried sudo lsusb and it shows that it is plugged in and active and when I unplug and refresh it is gone and replug back again. So, I know it's working. My question is how do I view the files on my harddrive? (HowTos)