Abstract: According to one embodiment, a magnetic recording medium includes: a data area on which a plurality of first magnetic dots are arranged at predetermined positions to record information; a servo area on which a plurality of second magnetic dots for specifying the positions of said plurality of first magnetic dots are arranged at predetermined positions; and servo frames configured so that a frequency of said servo frames is 2N per circumference of said medium having a radius, that said servo frames are radially discontinuous, and that said servo frame and a space-area, on which no servo frames exist, are alternately radially arranged at a cycle W.

Abstract: According to one embodiment, a magnetic recording apparatus configured to record information onto a magnetic recording medium by a shingled write recording method, the magnetic recording apparatus includes: a recording head configured to cover a plurality of dot arrays and an end portion of which is situated at one dot array of a recording target; an actuator configured to move the recording head by one array after the recording to one dot array by the recording head; and a controller configured to perform recording compensation of the magnetic dot based on prestored recording data of a peripheral dot of a magnetic dot when input user data is recorded to the magnetic dot.

Abstract: According to one embodiment, a magnetic recording medium includes: a data area on which a plurality of first magnetic dots are arranged at predetermined positions to record information; a servo area on which a plurality of second magnetic dots for specifying the positions of said plurality of first magnetic dots are arranged at predetermined positions; and servo frames configured so that a frequency of said servo frames is 2 N per circumference of said medium having a radius, that said servo frames are radially discontinuous, and that said servo frame and a space-area, on which no servo frames exist, are alternately radially arranged at a cycle W.

Abstract: According to one embodiment, a magnetic recording medium includes: a data area where a plurality of first magnetic dots are placed at predetermined positions to record information, the data area being formed on a surface of the magnetic recording medium; a servo area where a plurality of second magnetic dots for specifying the positions of the first magnetic dots are placed at predetermined positions, the servo area being formed on a surface of the magnetic recording medium; and servo address marks being doubly formed in the servo area, and subdivision being performed while boundary positions of second magnetic dots of one of the servo address marks and boundary positions of second magnetic dots of another one of the servo address marks are different from each other in a radial direction.

Abstract: According to one embodiment, a magnetic recording apparatus configured to record information onto a magnetic recording medium by a shingled write recording method, the magnetic recording apparatus includes: a recording head configured to cover a plurality of dot arrays and an end portion of which is situated at one dot array of a recording target; an actuator configured to move the recording head by one array after the recording to one dot array by the recording head; and a controller configured to perform recording compensation of the magnetic dot based on prestored recording data of a peripheral dot of a magnetic dot when input user data is recorded to the magnetic dot.

Abstract: According to one embodiment, a magnetic recording medium includes: a data region including a plurality of first magnetic dots disposed at specific positions for recording data; and a servo region including a plurality of second magnetic dots disposed at specific positions for identifying the position of the first magnetic dots, wherein an address pattern in the servo region is subdivided in the radial direction.

Abstract: According to one embodiment, an information storage medium includes a plurality of sectors arranged in a circumferential direction of a disk-shaped substrate, each sector having a servo pattern that is formed on the substrate and in which information indicating a position in a radial direction of the substrate is magnetically recorded, and a plurality of recording dots that is arranged with a predetermined pitch in the circumferential direction of the substrate and in which information is to be magnetically recorded. The servo pattern has a magnetic pattern arranged in the circumferential direction with a pitch having a predetermined integral ratio to the pitch of the recording dots. A recording dot arranged nearest to the servo pattern among the recording dots in each sector is arranged at a position having a constant phase relationship to the pitch of the servo pattern of the sector comprising the recording dots in any of the sectors.

Abstract: According to one embodiment, a media access method includes a head scanning each track of a magnetic recording medium while tilting with respect to a direction perpendicular to the track direction at all positions including a position with a skew angle of zero on the magnetic recording medium. The track includes at least one magnetic dot array. The core width of the head is set with respect to a pitch of magnetic dots in the track direction and a pitch in the direction perpendicular to the track direction so that the head does not simultaneously scan a plurality of magnetic dots while scanning one track.

Abstract: An information recording medium has a substrate, first recording dots, and second recording dots. The first recording dots are arranged in an array circumferentially in accordance with a predetermined regulation at mutual intervals in accordance with the regulation at a position in accordance with the regulation, and are used to magnetically record information. The second recording dots are arranged in an array circumferentially in accordance with the regulation at mutual intervals in accordance with the regulation. In the second recording dots, plural kinds of positions having different deviation amounts from the position in accordance with the regulation appear in one round of the array. The second recording dots are also used to magnetically record information.

Abstract: A magnetic recording medium formed on a substrate. The magnetic recording medium includes a data region including a plurality of magnetic dots arranged at predetermined positions on the substrate, for recording information; and a servo region for specifying the positions of the magnetic dots, the servo region including a plurality of magnetic segments arranged at predetermined positions on the substrate, each of the magnetic segments being smaller than each of the magnetic dots.

Abstract: A discrete track recording method records information on a magnetic recording medium having mutually adjacent tracks that are separated in advance by a groove. The discrete track recording method carries out a recording using a recording head having a core width in a range greater than or equal to a first value CW1 and less than a second value CW2 satisfying CW1<CW2 with respect to a first magnetic recording medium having a first track pitch TP1, and carries out a recording a recording head having a core width in a range greater than or equal to the second value CW2 and less than a third value CW3 satisfying CW2<CW3 with respect to a second magnetic recording medium having a second track pitch TP2 satisfying TP1<TP2.

Abstract: Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A point at which an amplitude of a reproduction waveform becomes zero or a point at which an amplitude of a magnetic signal changes from the positive to negative or from the negative to positive is detected, and a zero level detection signal or zero-cross detection signal is output to a clock generation circuit which then synchronizes a clock signal with the zero level detection signal or zero-cross detection signal. This enables a matching of the clock signal with a magnetic dot.

Abstract: Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A magnetic part arraying magnetic dots for recording a magnetic signal at certain intervals and a nonmagnetic part not recording a magnetic signal are featured in the patterned medium. A position of the nonmagnetic part not recording a magnetic signal is detected by a magnetic head and a clock signal is synchronized with a detection signal of the nonmagnetic part.

Abstract: A signal is recorded on a magnetic recording medium by changing a magnetized state of a magnetic member. The magnetic recording medium includes a plurality of servo signal areas in which servo signals for controlling a position of a reproducing head are recorded with different recording frequencies in parallel to a predetermined track so that the servo signals are read by the reproducing head when the reproducing head reproduces the servo signals along the predetermined track.

Abstract: A discrete track recording method records information on a magnetic recording medium having mutually adjacent tracks that are separated in advance by a groove. The discrete track recording method carries out a recording using a recording head having a core width in a range greater than or equal to a first value CW1 and less than a second value CW2 satisfying CW1<CW2 with respect to a first magnetic recording medium having a first track pitch TP1, and carries out a recording a recording head having a core width in a range greater than or equal to the second value CW2 and less than a third value CW3 satisfying CW2<CW3 with respect to a second magnetic recording medium having a second track pitch TP2 satisfying TP1<TP2.

Abstract: P-polarized parallel rays are irradiated on a magneto-optical disk 1 and reflected. The reflected light is reflected by a first beam splitter 14 and supplied to a reproduced signal detection system 20. This reflected light is supplied to a light shading plate 21, and a p-polarized component is transmitted at a transmittance of substantially 100% and an s-polarized component is transmitted at a transmittance of substantially 0%, i.e., reflected or absorbed so as to be shaded, in the area of a polarization film 21b. The light transmitted through the light shading plate 21 incides on a polarization beam splitter 19 where it is split into the p-polarized component and s-polarized component, and a reproduced signal is detected by differential detection.

Abstract: The magneto-optical recording and reproducing apparatus comprises a laser source, a collimator lens, an objective lens, a magneto-optical recording medium, a servo signal detector, a reproduction signal detector, a signal separating polarization beam splitter, a data recording polarization beam splitter and a data reproducing polarization beam splitter. The data recording polarization beam splitter and the data reproducing polarization beam splitter are disposed on a rotatable PBS holder so that the positions of the beam splitters can be changed according to whether the apparatus is for reproducing data or for recording data. With the apparatus, the quantity of light emitted from the laser source can be reduced since the optical path efficiency of the laser beam to the medium is enhanced at the time of recording, and carrier-output/noise ratio C/N can be increased at the time of reproducing.

Abstract: An optical disk apparatus includes a light source, an objective lens, a slider to hold the lens, a suspension to support the slider, a mirror located below the slider, and a seek mechanism to move the mirror and the slider in the tracking direction of an optical disk to be used. The mirror upwardly reflects light traveling in a predetermined horizontal direction, thereby causing the reflected light to enter the objective lens arranged above the mirror. The mirror is rotatable about a prescribed axis for causing the reflected light to shift in the above-mentioned horizontal direction.

Abstract: A data handling apparatus is provided which includes a rotatable disk provided with at least an innermost track and an outermost track for storing data, and a disk cartridge for housing the disk. The disk cartridge is formed with an opening for exposure of a portion of the disk. The opening is substantially symmetrical with respect to a first center line extending radially of the disk. The data handling apparatus also includes a slider floatable relative to the disk, and a driving mechanism for moving the slider relative to the disk along a transfer path. This transfer path and the first center line of the opening are arranged to be non-parallel to each other.

Abstract: A method and device for controlling a power of pulsed light is provided, which is emitted by a light source, condensed by a object lens and irradiated to a recording medium for recording information in the recording medium. In order to use the power more efficiently under the limitation of the maximum output of the light source and the maximum efficiency of condensing light in the optical system, the method includes steps of performing test writing with the pulsed light having a fixed bottom power and variable peak power, calculating an optimum average power in accordance with the bottom power and the peak power of the optimum condition obtained by the test writing step, and recalculating the peak power and the bottom power in accordance with the optimum average power so that the peak power is decreased and the bottom power is increased.