PURPOSE:To realize large-capacity recording, by linearly moving the rotating device of an electron beam disk in accordance with the signal of a central processor and aligning an information processing position with an electron beam projecting position. CONSTITUTION:A beam deflector 14 scans an electron beam 11 converged into a diameter of 0.1mum in an extent of a diameter 500mum under the control of a beam deflector control circuit 17 and writes information on an electron beam disk 16. Moreover, secondary electron beams produced from the disk 16 are detected by using a secondary electron beam detector 8 and recorded information is obtained. Then automatic focusing servo is performed by detecting a dislocation from a track by means of a track position signal reading-out circuit 20 by using the signal of a signal detecting circuit 19. A disk rotating device 15, on the other hand, moves linearly when a disk driving device 23 is actuated by the signal of a disk driving control circuit 22. Therefore, the electron beam 11 moves linearly while the scanning extent of 500mum in diameter is maintained and information can be written on the disk 16 over a wide area.