Patent ID: 6337839
Filing Date: 2002-01-08
Classification: G11B

Abstract:
A method of producing a mother stamper for optical disks on which a single recording spiral is formed by alternately connecting, every revolution, groove tracks and land tracks, each revolution of the recording spiral being divided into a plurality of recording sectors; and identification signals representing the address of each recording sector is formed as prepits at the head of the recording sector; said method comprising:forming a first address information part which is a part of the identification signal, such that it is shifted by a predetermined amount in one radial direction from the center of the groove track, forming a second address information part which is another part of the identification signal, such that it is shifted by said predetermined amount in the other radial direction from the center of the groove track, and the prepits of said first address information part representing the address of a recording sector in the groove track, while the prepits of said second address information part representing the address of a recording sector in the land track adjacent to the groove track, and assigning the addresses to said first and second address information parts such that the addresses are increased or decreased monotonically in the order in which the recording sectors are arranged along the recording spiral, regardless of whether the recording sectors are on the groove track or on the land track.