This study -under contract with ESA/ESTEC- concerns the feasibility of upgrading commercially optical mass storage equipment. It addresses the environmental conditions expected in Columbus, and the verification procedures (Part II). From the optical storage devices Philips is involved in, the CD-ROM-CM200 serie is selected as a promising space-borne candidate. Space-qualification seems feasible, though several VLSI components, the basic drive and the disc storage medium have to be qualified without redesign them (Part III). The study gives an overview of the available ground support, and indicates the use in manned space missions (Part IV) . It deals briefly with the use of optical mass storage in unmanned missions.