a method for coded , sequential , non - coherent , redundant , optical data storage wherein a number of one - dimensional holograms is recorded in a timed succession upon a light - sensitive tape through the utilization of a pulse amplitude - modulated light beam and a correction light beam of the light - sensitive tape is separately effected from the signal beam with respect to space and time in such a way that the entire exposure resulting from the signal exposure beam and the correction exposure beam is constant during each recordation , and wherein either the pulse amplitude - modulated light beam or the correction exposure beam are modulated with a noise intensity with respect to time in such a way that the contrast of the individual recorded holograms varies statistically .