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Proceedings Paper

High-density phase-change recording beyond 2.6 Gb
Author(s): Herman J. Borg; J. P. W. B. Duchateau
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Paper Abstract

We review the current status of high density phase-change optical recording at red wavelengths. A user bit capacity of 3.0 GByte has been realized on a 120 mm rewritable disk by using in-groove recording and a simple and reliable wobbled groove format. The headerless format shows excellent data and address integrity during cyclability tests and it has a high degree of compatibility with read-only DVD. In order to extend disk capacity even further, both radial and tangential densities must be increased. In increasing the radial density, land/groove recording appears more promising than in-groove recording because optical cross-talk between neighboring tracks can be largely cancelled. A reduction of the track pitch in land/groove recording below 0.74 micrometers results in thermal cross-talk, leading to partial erasure of data in the adjacent tracks. The minimum bit length which gives acceptable recording tolerances in both land and groove tracks is 0.32 micrometers . With the combination of a track pitch of 0.74 micrometers and a bit length of 0.32 micrometers , an areal density of 2.7 Gbit/in2 and a user capacity of 3.5 GByte should be possible in land/groove recording.

Paper Details

Date Published: 30 July 1997
PDF: 6 pages
Proc. SPIE 3109, Optical Data Storage 1997 Topical Meeting, (30 July 1997); doi: 10.1117/12.280700
Show Author Affiliations
Herman J. Borg, Philips Research Labs. (Netherlands)
J. P. W. B. Duchateau, Philips Research Labs. (Netherlands)

Published in SPIE Proceedings Vol. 3109:
Optical Data Storage 1997 Topical Meeting
Henryk Birecki; James Z. Kwiecien, Editor(s)

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