If you are in the admin group, you can delete a drive as follows:

• Click on Tools / Options

   

The Options screen will then appear.  Ensure that you are in the 'Drives' tab from the tab group.

    

• Click on the Delete checkbox(es) for the drive that you wish to delete.
• Click on Update drive mappings

Warning: The folder will automatically be deleted at this point. 

• Click on Close Window to exit the screen.

You can also Delete a Folder or Delete a File.