DATABERARE I FORM AV ETT FORETREDESVIS REKTANGULERT KORT MED ETT CIRKULERT OMRADE FOR TET OPTISK REGISTRERING AV DATA

摘要

A data registration medium for optical data storage comprises a rectangular card (1) preferably of the same kind as a credit card. The area where data is stored is an annular portion (2) with a width (d) which is much less than its diameter.