Deep-Groove and Low-Noise-Mastering

Abstract

The low capacity in the recordable optical disks can be a damper on international market acceptance of the optical disk memories. Fortunately, some technologies have already been reported to achieve the higher bit density on the rewritable optical disks1,2). However, few technologies can support the higher track density which means narrowing a track pitch of an optical disk through suppressing both thermal and optical cross-talk from adjacent tracks in addition to decreasing the groove noise. Unfortunately, (reactive ion etching) there is no attractive contribution based on the mastering and the disk substrate technologies to improve the noise performance of the optical disks though the high signal to noise ratio must be achieved in the high density recording. We have already proposed the high stamper density recordable optical disk with a deep groove substrate reproduced from a stamper manufactured using the low noise mastering3,4,5).