A holographic storage apparatus for recording data in a holographic medium
includes at least one light source for generating a reference beam and a
signal beam. The reference beam is preferably a phase beam of unchanging
phase content. The apparatus also includes a holographic medium placed in
a path of the reference beam and a path of the signal beam. The
holographic medium has a first face and both the reference beam and the
signal beam enter the holographic medium through the first face. The
holographic medium also includes a data reflective surface. The reference
beam and the signal beam interfere in the holographic medium to create a
hologram only after at least one of the reference beam and the signal
beam have reflected off of the data reflective surface.