Difference between cd and dvd's ?

All, This is very strang e I actually purchased the box set of SuSE 9.2 Pro. I installed it on a machine at work with the regular cd's because I have no dvd in it, I also installed it at home off the DVD. Well the machine at work when I go in to yast and do a search for the ximian-connector it does not find it, but at home off the dvd install it found it and installed it fine.