L/G recording with 0.45-um track pitch in CAD-MSR disk

Y. Murakami; Shunji Maeda; Akira Takahashi; Yasuhito Tanaka; Tetsu Watanabe

doi:10.1117/12.997565

28 June 1999 L/G recording with 0.45-μm track pitch in CAD-MSR disk

Y. Murakami, Shunji Maeda, Akira Takahashi, Yasuhito Tanaka, Tetsu Watanabe

Proceedings Volume 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999; 38640M (1999) https://doi.org/10.1117/12.997565
Event: Optical Data Storage, 1999, Kauai, HI, United States

Abstract

A 6 GB user-capacity disk with a 120 mm-diameter single side substrate was realized by the use of a center aperture detection (CAD) type of magnetically induced super resolution (MSR) disk through the AS-MO (Advanced Storage Magneto Optical) activity. It utilized a practical optics which consists of a 640 nm wavelength laser and a 0.6 numerical aperture (NA) lens, and land and groove (L/G) recording with an effective track pitch of 0.6 pm was realized. The areal bit density reached to 4.6 Gbit/in² with available system margins. In this report, we present improved CADMSR performance at narrower pitch tracks and at higher linear density with the same optics.

Citation Download Citation

Y. Murakami, Shunji Maeda, Akira Takahashi, Yasuhito Tanaka, and Tetsu Watanabe "L/G recording with 0.45-μm track pitch in CAD-MSR disk", Proc. SPIE 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999, 38640M (28 June 1999); https://doi.org/10.1117/12.997565

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