光磁気ディスクにおける信号処理技術の進展

概要

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The recent rapid digitalization of data such as motion pictures requires huge amounts of information to be handled, and there is an increasing need for rewritable, portable, high-capacity media. One of the most likely data storage media to satisfy this demand, and one of the most reliable, is the magneto-optical (MO) disk. From the introduction of the 128 MB MO (3.5-inch diameter, ISO standard) in 1992 as a personal MO until 1.3 GB GIGAMO in 1998, the areal density increased by more than 10 times over a 7-year period. The areal density was 0.39 Gbit/inch^2 in the 128 MB MO, which we can call the first generation, and 0.53 Gbit/inch^2 in the second generation (230 MB), which used the same recording method (pit position recording). A new recording method, mark edge recording, made possible a recording density of over 1 Gbit/inch^2 in the third generation (540/640 MB). In the current fourth generation (1.3 GB), it grew to 2.5 Gbit/inch^2 thanks to the introduction of magnetically induced super-resolution (MSR) media techniques. A new standard for 120-mm diameter MO, AS-MO, was established in May 1998, which could allow areal densities of up to 4.6 Gbit/inch-2. This article considers the likely future direction of magneto-optical disks by looking back at the changes that have occurred up to now, focusing on signal processing techniques.
1999-11-01