JPS6421761A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To record a control signal to a disk itself by bisecting a writable and rewritable region of each sector of the disk, recording an information signal to an information area and recording separately a control signal to a control area. CONSTITUTION:The writable or rewritable region 12 of each sector is further divided into two, i.e., 1st and 2nd areas; the 1st area is recorded as the information area 14 with bits of the user's information such as computer data and documents, etc., while the 2nd area is recorded as the control area 13 with control signal such as secret signals and code keys. The erasing prior to the information recording is carried out over the whole rewritable area, and a bit of recording information 24 is recorded by a recording head into the writable or rewritable area, but in this case, the recording is performed into the information area 14 only by jumping over the control area 13, while the control signal 23 is simultaneously or separately recorded into the control area 13. By this method, the control signal for indicating how to deal with the information recorded per sector for every individual sector of the disk can thus be recorded.