Method and apparatus for magneto-optical recording and reading u

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369 54, 369 48, G11B 700

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active

057038651

ABSTRACT:
A magneto-optical (MO) disk drive. In one embodiment, the MO disk drive comprises a drive controller that controls operation of a laser source and a disk drive mechanism. The drive controller comprises a microprocessor and a memory subsystem coupled to the microprocessor. The memory subsystem comprises a memory device that stores programs directing operation of the disk drive and information used by the programs during operation of the disk drive. The stored information comprises an identifier that matches an identifier of a magnetic medium. The stored information also comprises a set of constant values characteristic of physical properties of the magnetic medium denoted by the letters h, k, s, c, .alpha., .beta. and .delta.. The stored information also comprises a set of equations that determine optimum write powers as a function of linear velocity, v, of the magnetic medium. The equations include:

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patent: 5631890 (1997-05-01), Ikeda
Yoshihiro, Masafumi et al., "Write/Erase Cyclability of TbFeCo for Mark-Edge Recording" Jpn. J. Appl. Phys. vol. 32 (1993) Pt. 1, No. 11B, pp. 5441-5442.
Uchino, Ken-ichi et al., "High-Density Pulse Width Modulation Recording and Rewritable Capability in GeSb Te Phase-Change System Using Visible Laser Beams at Low Linear Velocity" Jpn. J. Appl. Phys. vol. 32 (1993) pp. 5354-5360.
Mansuripur, Masud and Connell, G. A. N., "Laser-induced local heating of moving multilayer media" Applied Optics vol. 22, No. 5, Mar. 1, 1983, pp. 666-670.
Mansuripur Masud et al., "Laser-induced heating of multilayers" Applied Optics, vol. 21, No. 6, Mar. 15, 1982, pp. 1106-1114.
Mansuripur Masud "The Physical Principles of Magneto-optical Recording" Cambridge University Press (1995). pp. vii-xiv; 350-390.

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