Data format for magnetically coated film

摘要

In a photographic film having a substantially transparent magnetic layer, and a sequence of longitudinally spaced image frames, the improvement comprising: at least one longitudinal magnetic track in said magnetic layer located on a side of each image frame, said track having a fixed length L; and a pair of data blocks recorded on said track, each said data block having a length which is less than L/2 and being recorded respectively at the beginning and end of said track with an unrecorded space between said data blocks.