H. Watanabe, E. Koyama, T. Nunomura, T. Taii, T. Iida, M. Miura, A. Gotoh, T. Nishida, S. Horigome, N. Ohta
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Highly Reliable 7GB, 1.2-2.2MB/S Twelve inch Write Once Optical Disk
12" W-O type optical disks are used for large capacity archival data storage system. To extend application area more widely both larger data capacity and higher data transfer rate are required. Such a high density disk also requires more advanced reliability and durability. This paper describes double sided 7GB twelve inch diameter disk for high data rate (1.2-2.2MB/s) application keeping disk life longer than 45 years. User data capacity is advanced using pit-edge method1) and MCAV(Modified Constant Angular velocity) method. Corrosion resistant Te alloy recording layer has high signal to noise ratio, and wide jitter margin. High rotation speed makes data transfer rate higher. Acceleration test shows high reliability.
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