Abstract: In a method of recording data into a desired sector of a desired track on an optical card which includes a plurality of parallel tracks extending a track direction, each track comprising an ID portion in which track address is recorded and a data portion which is divided into a plurality of sectors, after accessing to the desired track, the track is first scanned in a forward direction in the track direction to find whether the desired sector is actually blank or not, and as soon as the relevant sector is checked to be vacant, the movement of the optical card is stopped and the optical card is moved in a backward direction in the track direction. Then, the optical card is moved again in the forward direction and the light beam is changed into a recording high power and is modulated in accordance with the data to be recorded when the light beam comes at a start point of the desired sector. In this manner, the data can be recorded into the desired sector within a short time.

Abstract: A plurality of recording tracks are formed on an optical card. A data record starting flag or data record and flag is formed on at least one of both sides of the recording tracks in the track extending direction.

Abstract: An image display apparatus comprises means for storing segment addresses of a plurality of selected image data and means for selectively taking out the segment addresses and forming addresses of an image memory of one picture plane on which those plurality of image data are combined and displayed. The segment address storing means is constituted by address registers which are cascade connected. The image memory address forming means is constituted by means for adding the selected segment address data and an output of a pixel counter.