28 June 1999 L/G recording with 0.45-μm track pitch in CAD-MSR disk
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. Murakami, Y. Murakami, Shunji Maeda, Shunji Maeda, Akira Takahashi, Akira Takahashi, Yasuhito Tanaka, Yasuhito Tanaka, Tetsu Watanabe, 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); doi: 10.1117/12.997565; https://doi.org/10.1117/12.997565

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