1. A magnetic information storage system comprising a flexible disk storage medium including a base film substrate and at least one magnetic recording layer suitable for recording a plurality of separate tracks; a plurality of headers on at least one of said tracks, each of the headers occupying a discrete angular portion of the disk and carrying an encoded sequence readable by only one of a plurality of target computers, said sequence comprising directions to the computer to load the encoded information and further to step out and to process a plurality of data tracks located elsewhere on the disk.