Is this Win 7?
If so, similar question was asked by a Micro Mart reader this week, but the request was 'how do I show empty drives'.
Answer was,
Open Explorer, click 'Organize', 'Folder and search options', on the tab view, tick or untick 'Hide empty drives in Computer folder'
Hope this helps, I cant confirm if it works as I don't use Windoze any more.
Gibbo.