The present application discloses a memory system apparatus such as might be utilized to store binary digital information in a digital processing system. The apparatus includes means for utilizing the travel of a magnetic domain wall through a magnetic medium to thereby provide a memory replacement for revolving magnetic medium drums and discs as well as for rotating magnetic tapes. The present apparatus provides the basic capability of these earlier devices while eliminating all mechanical movement. Further, it accomplishes this feat with a memory system apparatus which has removable magnetic media.