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Proceedings Paper

High-density recording for greater than 1-GByte capacity using a 90-mm phase-change optical disk
Author(s): Hiromichi Kobori; Hiroshi Hasegawa; Toshihiro Sugaya; Naoki Morishita; Naomasa Nakamura; Katsumi Suzuki
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Paper Abstract

The mark edge recording characteristics of a new thermally balanced phase-change optical disk operating at a wavelength of 690 nm have been studied, especially from the viewpoint of designing an optical disk drive. As a recording method, the multi-pulse write compensation method with constant duration of the read power level immediately after every multi-pulse, called the off-pulse, was applied. A high carrier-to-noise ratio (CNR) of 54 dB, a high erasability of 35 dB, and an overwrite power margin from -15% to +5% were obtained for a bit length of 0.5 micrometers and a track pitch of 1.0 micrometers at 14.7 m/s linear velocity. These results mean that it is possible to design an optical disk drive providing a capacity of 1.1 GBytes using a 90 mm double-sided disk. Further, it has been found that the off-pulse plays a very important role in controlling the precision of mark edge recording.

Paper Details

Date Published: 12 October 1994
PDF: 5 pages
Proc. SPIE 2338, 1994 Topical Meeting on Optical Data Storage, (12 October 1994); doi: 10.1117/12.190174
Show Author Affiliations
Hiromichi Kobori, Toshiba Corp. (Japan)
Hiroshi Hasegawa, Toshiba Corp. (Japan)
Toshihiro Sugaya, Toshiba Corp. (Japan)
Naoki Morishita, Toshiba Corp. (Japan)
Naomasa Nakamura, Toshiba Corp. (Japan)
Katsumi Suzuki, Toshiba Corp. (Japan)


Published in SPIE Proceedings Vol. 2338:
1994 Topical Meeting on Optical Data Storage
David K. Campbell; Martin Chen; Koichi Ogawa, Editor(s)

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