Abstract: A magnetic storage medium such as a BPM includes a plurality of magnetic dots for writing and reproducing data disposed in a magnetically separated manner so as to be spaced a predetermined distance in a down-track direction and a plurality of tracks concentrically disposed so that the magnetic dots are disposed in a magnetically separated manner. In the BPM, a phase-adjusting track is disposed in an arbitrary track among the tracks. On the phase-adjusting track, phase detection dots disposed in a down-track direction to allow writing and reproduction of phase detection data and blank bits providing a predetermined phase difference in a down-track direction to next successive phase-detecting dots are alternately disposed in a successive manner.

Abstract: A magnetic storage medium has tracks and guard bands magnetically separating adjacent tracks. The tracks and the guard bands are alternately and concentrically disposed. The tracks includes a plurality of data tracks in which data can be written and from which data can be reproduced and servo patterns disposed between the data tracks and allowing reproduction of positional information of the data tracks. The magnetic storage medium includes an offset-amount measurement area in which traverse tracks are formed so as to traverse adjacent tracks via each of the guard bands so that writing regarding offset measurement data for measuring an offset amount between a storage element and a reproducing element of a magnetic head unit is allowed at a center position of the storage element.

Abstract: A servo pattern is positioned in a DC erased portion to which a DC erase process has been performed, and recording tracks and track groove portions (discrete portions) are positioned in an AC erased portion to which an AC erase process has been performed. The track groove portions extend in a circumferential direction. The AC erased portion and the DC erased portion are both made of a magnetic material. In the servo pattern, four lines of preamble portions extending almost in a radial direction are formed and a plurality of pit portions disposed in a dotted manner in two lines are arranged. The pit portions are positioned rearward of the preamble portions in respect of a scanning direction of a magnetic head.

Abstract: An information storage apparatus includes: a recording medium on which first information is recorded by a physical arrangement of magnetic bits and second information is recorded by magnetizing the magnetic bits; a first reproduction part that reads third information including the first information and the second information; an erasing part that erases the second information that is recorded on the information recording medium and is related to the third information read by the first reproduction part; a second reproduction part that reads the first information from the magnetic bits from which the second information is erased by the erasing part; and an information obtaining part that obtains the second information from the first information and the third information respectively read by the first and second reproduction parts.

Abstract: A magnetic storage medium such as a BPM includes a plurality of magnetic dots for writing and reproducing data disposed in a magnetically separated manner so as to be spaced a predetermined distance in a down-track direction and a plurality of tracks concentrically disposed so that the magnetic dots are disposed in a magnetically separated manner. In the BPM, a phase-adjusting track is disposed in an arbitrary track among the tracks. On the phase-adjusting track, phase detection dots disposed in a down-track direction to allow writing and reproduction of phase detection data and blank bits providing a predetermined phase difference in a down-track direction to next successive phase-detecting dots are alternately disposed in a successive manner.

Abstract: A magnetic storage medium has tracks and guard bands magnetically separating adjacent tracks. The tracks and the guard bands are alternately and concentrically disposed. The tracks includes a plurality of data tracks in which data can be written and from which data can be reproduced and servo patterns disposed between the data tracks and allowing reproduction of positional information of the data tracks. The magnetic storage medium includes an offset-amount measurement area in which traverse tracks are formed so as to traverse adjacent tracks via each of the guard bands so that writing regarding offset measurement data for measuring an offset amount between a storage element and a reproducing element of a magnetic head unit is allowed at a center position of the storage element.

Abstract: The information reproducing method manages an average magnetization state of each sector on a bit-patterned recording medium as sector management information and sets an information reproduction condition for the sector on the bit-patterned recording medium, based on the sector management information.

Abstract: A magnetic recording medium for vertical magnetic recording includes a substrate, and a layer laminated on the substrate, including a first magnetic recording layer made of a granular material, an exchange-coupling-strength control layer, a second magnetic recording layer made of a granular material, and a third magnetic recording layer made of a non-granular material.

Abstract: The recording method for an optical recording medium with a laminated structure with a ROM layer, from which data having been recorded beforehand can be read out, and a RAM layer, from which data is read out and in which data is recordable, includes: emitting laser light that has two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, thereby recording the RAM record mark.

Abstract: A servo pattern is positioned in a DC erased portion to which a DC erase process has been performed, and recording tracks and track groove portions (discrete portions) are positioned in an AC erased portion to which an AC erase process has been performed. The track groove portions extend in a circumferential direction. The AC erased portion and the DC erased portion are both made of a magnetic material. In the servo pattern, four lines of preamble portions extending almost in a radial direction are formed and a plurality of pit portions disposed in a dotted manner in two lines are arranged. The pit portions are positioned rearward of the preamble portions in respect of a scanning direction of a magnetic head.

Abstract: An optical disk apparatus records new information related to the ROM information into RAM at a position linked with the ROM information of an optical information storage medium while continuously regenerating the ROM information of the optical information storage medium. At least the ROM signals are read at n (n>2) times of the information regeneration velocity V, which is a reference, and stored in a buffer memory for reading, then the stored information is output at a velocity of the information regeneration velocity V. And while the stored information is being output from the buffer memory for reading, the input information is stored in the buffer memory for writing, then the optical head is accessed an address position that is managed so that the time relationship of the output information and the input information link for recording.

Abstract: Recording density is improved by performing anneal processing on an optical storage medium (4). Anneal management information (40) is recorded in the optical storage medium (4) without performing anneal processing, and is provided to a user. Anneal processing is performed and high density recording and reproducing is enabled by the effect of annealing on an area between recording tracks based on the choice of the user. Since initialization processing (anneal processing) by a storage medium manufacturer can be omitted, the medium can be provided at low price. Also a deep groove medium need not be used because of the effect of annealing, thereby the manufacturing of a substrate used for a medium is easy. It is preferable that advertisement information is recorded in a pit section (4-1) as content information, so that the content can be reproduced automatically during anneal processing, and the medium price can be reduced due to advertisement fees.

Abstract: The present invention relates to an information storage apparatus that stores information in a storage medium, through the perpendicular magnetic recording system, and provides an information storage apparatus and a storage medium that can maintain the stability of recording and reproducing. The information storage apparatus includes a detection section that detects an alignment condition of magnetizations at each of portions on a storage medium and an alignment-condition recording section that records in the storage medium the alignment condition that has been detected by the detection section.

Abstract: A storage apparatus, capable of record or reproduce of an optical information recording medium in which ROM information is recorded with phase pits and RAM information is recorded on top of a recording region of the phase pits, has a main controller that, when the output of the recording information detection system—a system for detecting reflected light of a laser beam from the optical information recording medium and generating signals corresponding to ROM and RAM information—simultaneously contains ROM and RAM signals corresponding to ROM and RAM information, performs negative feedback control of a semiconductor laser emission using ROM signal in the output of the recording information detection system and performs control so as to obtain read-out and played-back ROM signal from the output of an optical intensity detection system for detecting the intensity of the laser light.

Abstract: For a concurrent ROM-RAM recording medium, the present invention provides an optical information processing apparatus which can accurately read a RAM signal at the time of high-speed transfer without reducing a phase pit depth. The optical information processing apparatus is an optical information processing apparatus for controlling writing and reading of information on a concurrent ROM-RAM recording medium recording ROM signal information as a phase pit on a track and magneto-optically recording RAM signal information on the phase pit, comprising an optical system for forming two (2) first and second beam spots with an interval on the same track of the recording medium; a circuit unit for modulating the first beam spot intensity with a second ROM signal read by the second beam spot; and a circuit for detecting a RAM signal from a first ROM signal read by the first beam spot.

Abstract: There is disclosed a small lightweight optical information storage apparatus which can obtain a sufficient writing light quantity, and an optical device which can realize the optical information storage apparatus. The optical device for use in the optical information storage apparatus has a splitting surface constituted of a part of a cylindrical surface. A light emitted from a light source is passed via the optical device and directed to an optical information storage medium, and a signal light is split from a return light from the optical information storage medium by the optical device.

Abstract: The recording method for an optical recording medium with a laminated structure with a ROM layer, from which data having been recorded beforehand can be read out, and a RAM layer, from which data is read out and in which data is recordable, includes: emitting laser light that has two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, thereby recording the RAM record mark.

Abstract: A magneto-optical recording medium has a substrate having a ROM area with a plurality of phase pits defined therein as providing a ROM signal, and a magneto-optical recording film deposited in an area of said substrate which corresponds to said ROM area, for recording a RAM signal. The phase pits have edges having an average angle of inclination ranging from 10° to 40° at a position in a range of one-half of the depth of each of the phase pits ±20%. Each of said phase pits has a width ranging from 300 nm to 500 nm, and is modulated by a modulation factor ranging from 10% to 30%.

Abstract: An optical device including a light source for emitting diverging light, a polarizing beam splitter for transmitting or reflecting the diverging light according to a polarized light component, a collimator lens for converting the diverging light transmitted through the polarizing beam splitter into collimated light, and an objective lens for focusing the collimated light on an object. The optical device further includes an optical element arranged between the collimator lens and the objective lens for producing a phase difference of +90°±15° or ?90°±15° between P-polarized light and S-polarized light. The optical element has a principal axis perpendicular or parallel to a plane of incidence of the diverging light on the polarizing beam splitter. For example, the optical element is provided by a quarter-wave plate having an optic axis perpendicular or parallel to the plane of incidence of the diverging light on the polarizing beam splitter.

Abstract: An optical information recording medium can reproduce stably RAM information during concurrent reading out of ROM-RAM information. The optical information recording medium comprises a substrate having a ROM area where phase pits to be ROM data are formed, and a magneto-optical recording film for recording RAM data, formed on an area corresponding to the ROM area of the substrate and, in the ROM area, the degree of modulation in the user area is at least 10-37% and, preferably, the degree of modulation of the phase pits in the user area is 15-25%. As an aspect, the optical depth of the phase pits is approximately ?/8-?/10 (? is the wavelength of the laser used for recording/reproducing).