Optical memory card in the form of a disk

Optical memory medium and its information recording and erasing

Optical recording and reproducing method utilizing recording med

Optical recording apparatus using optical fibers for guiding las

Optical recording medium having a non-volatile identification co

Optical recording medium having a non-volatile identification co

Optical recording medium having a parameter for identifying the

Optical recording medium having a third non-linear optical refle

Optical servo for magnetic disks

Portfolio photo CD visual/audio display system

Recording media including auxiliary memory of different types

Recording medium having content identification section

Recording medium recording apparatus and method and recording me

Recording/reproducing apparatus using optical magnetic tape

Retrieval apparatus with repeated retrieval of inputted characte

Retrieval apparatus with repeated retrieval of inputted characte

Retrieval method with repeated retrieval of inputted characters

Storage device capable of using both optical and magnetic disk u

System and method using optical fibers in a data storage and ret

System for reading information from two storage layers of an opt