INFORMATION RECORDING MEDIUM

摘要

PURPOSE:To suppress the decrease in recording capacity on an outer peripheral side and to execute stable recording while maintaining high-speed access by gradually widening the information bit intervals of a constant angular velocity (CAV) type header toward the outer peripheral side of the recording medium so that the prescribed intervals are obtd. on the outermost peripheral side. CONSTITUTION:The header information from a header forming circuit 15 is recorded by the CAV system on a master disk 1 for recording or the like which is rotated at a constant speed by a spindle motor 2. This circuit 15 is controlled by the clock of the variable frequency from a variable frequency divider 14 controlled by a control circuit 5 and the bit intervals of the header information recorded on the medium 1 are gradually widened stepwise from the inner peripheral side to the outer peripheral side of the medium 1 so that the intervals smaller than the intermediate of the innermost peripheral intervals and the outermost peripheral intervals by the CAV system are obtd. on the outermost periphery. The recording capacity on the outer peripheral side is, therefore, larger than the recording capacity by the CAV type intervals and the decrease in the memory capacity is suppressed. The stable header information recording is executed while the access time is maintained at the high speed by this constitution.