How do I unlock the taskbar?

In the past I have been able to resize my Window Taskbar. Now I cannot seem to grab the top edge in order to make it smaller. It’s huge at the moment and rather annoying. Any idea why this is the case?

How do I pin a hard drive to my Taskbar?

I’m a big fan of Windows 7 and I just the fact that I can pin applications to my Taskbar so I can access them quickly. I’d like to pin my C drive to the taskbar so I can access my files quickly, but dragging it down doesn’t work. How can I do this?