External Drive not mounting on Desktop but visible on sidebar

I have an external drive Iomega 1T that appears on the destop on Snow Leopard and all is perfect with it, but not showing on the destop in Lion (installed on another internal), it shows up on the sidebar and can access it from there without issues. Disk utilities shows it and can repair permissions and all but can't mount on desktop, my only option there is to unmount it, but is not even showing up on desktop to unmount it.
Do I need to reformat it to mount on desktop? Any help is appreciated.

A little bit, yes. What got me a little confused was that all of my 3 internal drives showed up, and I thought that by selecting it to appear on the sidebar would be visible on the desktop. Thanks again, Lion is very snappy on my early 2008 8 core 2.8, like having a new Mac .

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