Optical disk device

Abstract

Abstract PURPOSE:To increase the processing speed and to prevent the duplicated writing, by writing a written flag (protection flag) to a sector part and carrying out the detection of a written track simultaneously with an on-track (seek end). CONSTITUTION:An instruction is supplied to a control circuit 37 through a bus 20. The circuit 37 decodes the instruction and then decides whether the instruction indicates the writing to all sectors as long as the instruction is equal to a writing instruction. In the case of a writing instruction to all sectors, a protection flag pattern generating circuit 40 is actuated after a seek operation is over. Then a protection flag is written to each sector via a selecting circuit 34, a light amplifier 35 and an optical head 41 respectively. In this case, the protection flag is written together with a data part if it is written to all sectors of the corresponding track and when it is decided that the data part is already written to all sectors of said track. The protection flag is checked before the writing instruction is executed. Then the writing is rejected if just a single protection flag is detected: while all sectors are read if no protection flag is detected. Then the writing is carried out after the state is discriminated.

Inventors

• 👤 Seiichi Yamaguchi
• 👤 誠一 山口

Bibliographic Details