Shoutbox

You can merge the two drives, but the second drive needs to be empty, otherwise a lot of data can be lost.

You can do this through disk administrator, press windows key + r, then type in "compmgmt.msc" in this window, click "Disk Management and the window will appear, have a fiddle around with this to try and do it.

I don't have 2 physical drives so I can't try it out.