Magnetic recording medium

摘要

PCT No. PCT/JP92/01376 Sec. 371 Date Jun. 15, 1993 Sec. 102(e) Date Jun. 15, 1993 PCT Filed Oct. 22, 1992In a magnetic recording medium in which light is applied to a magnetic head-tracking optical recess and a data track between these recesses so as to effect a tracking of a magnetic head in accordance with light reflected by them, variation in light reflectance is limited to not more than 4 dB in a frequency range of 100 Hz to 2 KHz and a thickness of the magnetic layer at the data track, or a depth of the recess is set to a specified range so that a tracking servo can be effected properly, thereby enhancing reliability of the magnetic recording medium.