Best way to combine libraries in Aperture?
The hard drive on which my Aperture library currently resides has run out of space and I've added another drive, creating a new library on it. The trouble is if I run Aperature with that library open then all that I see are the photos on that drive. In order to see all of my photos at one time do all of the libraries need to be on the same drive? If so, what's the best (safest) way to combine these onto the new drive?
Mac Pro, OS X Mountain Lion (10.8.3), 2.66 Ghz Quad Core