laser beam and the recording pit and blank by increasing or decreasing the data signal timing and also prevents increase in the recorded bit width by dividing the data signal timing the output data of the data signal correction circuit 36 is applied to a laser generation circuit 35 the laser generation circuit 35 irradiates the semiconductor laser beam in the optical head 23 on the recording surface of the optical disc 21 to effect recording in this manner data is recorded on the optical disc 21 with a format transfer velocity and linear velocity conforming to the compact disc standard the toc subcode memory 44 successively stores in synchronization with the writing operation on the optical disc 21 as described before the track number index number and time code information such as program time and absolute time produced by the subcode generator 42 and also stores input information such as alphabets and numerical values applied from the input device 2 thereby forming and holding information toc to be finally written in the lead in area li therefore the toc subcode memory 44 constitutes auxiliary information holding means for storing and holding all of toc subcode and user 39 s bit necessary for mastering according to the invention the toc subcode memory 44 is required to be of a.