We discussed data error propagation due to dust on disk surfaces in cases of various cover coat thicknesses and dust sizes. We proposed a system durability gauge K-value and discussed abilities of error correction codings (ECCs) by using a measured Kvalue. A measured dust particle distribution was shown, and error propagation was calculated for thin-cover cases with different K-values. We found that 0.6-1.2 mm cover coat disk systems are free of errors due to dust and a thin-cover coat disk is not always worse. In the thin-cover coat systems, it is particularly necessary to increase K-value and to optimize ECC schemes.
A new structure disk was developed for a magneto-optical (MO) composite head system. The new disk has a thin readout substrate under and a high magnetic permeability layer over the MO layer. The effect of the high magnetic permeability layer was confirmed experimentally and agreed well with theoretical results. The normal component of the magnetic field at the MO layer is enhanced 1.6 times by the high magnetic permeability layer.
A new magneto-optical recording method of magnetic field modulation with pulsed laser irradiation has been developed. In this paper, we report the theory of the recording process and the characteristics of the method. This method is appropriate for high power-efficiency and high density edge-recording.
An optical disk generally has a substrate with a thickness of 1.2 mm, which makes it difficult to realize a compact read-write head and double-sided magneto-optical (MO) disk drive capable of direct overwriting using magnetic field modulation. We propose a system using a disk with a thinner substrate to overcome the problems. In the new system, a very small piece of dust on the surface of the substrate can cause data errors, but error length is shorter than in the conventional system. This paper clarifies the influence of dust on the thin substrate on error propagation.
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