Abstract: In the magnetic recording apparatus, a recording layer is formed in a concavo-convex pattern, and recording elements are formed of convex portions of the concavo-convex pattern. Furthermore, the following equation (I) BL?ERL?BL+2×GL??(Equation (I)) is satisfied in each of tracks, where BL represents a length of the recording element in a circumferential direction, GL represents a length of a gap between the recording elements in the circumferential direction, and ERL represents an effective recording length which is a length of an effective recording area ER in the circumferential direction, the effective recording area ER being created on a magnetic recording medium by a heating head and a recording head.

Abstract: The magnetic recording and reproducing apparatus includes: a perpendicular recording magnetic recording medium including a track pattern including track portions and gap portions arranged so as to be alternately adjacent to each other in a cross-track direction, at least part of portions corresponding to the track portions being recording areas having the width substantially the same as the width of the track portions, portions between the recording areas being non-recording areas; and a magnetic head of a perpendicular recording type for applying a recording magnetic field to the recording areas. The anisotropic magnetic field Hk (T) of the recording areas of the magnetic recording medium and the recording magnetic field intensity Fw (t) of the recording magnetic field at the upper surface of the recording areas satisfy the following inequality (I): 0.23×Fw+1.2?Hk?0.26×Fw+1.6.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region. Each burst pattern is formed so as to include two types of burst signal units that have an equal length along a radial direction of the substrate. In a predetermined range (2·M) centers in the radial direction of the burst patterns are present at intervals of (1/N) times the track pitch in the radial direction. The predetermined range has a length along the radial direction of (2M/N) times the track pitch. M or N is a natural number of two or higher. The two types of burst signal units are formed of non-recording regions and facing end parts in the radial direction of the first type of burst signal units and the second type of burst signal units are separated via recording regions.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region. Each burst pattern is formed so as to include two types of burst signal units that have an equal length along a radial direction of the substrate. In a predetermined range, (2M) centers in the radial direction of the burst patterns are present at intervals of (1/N) times the track pitch in the radial direction. The predetermined range has a length along the radial direction of (2M/N) times the track pitch. M or N is a natural number of 2 or higher. The two types of burst signal units are formed of non-recording regions and end regions of the burst signal units overlap in the radial direction in at least one part region of the substrate.

Abstract: In the magnetic recording apparatus, a recording layer is formed in a concavo-convex pattern, and recording elements are formed of convex portions of the concavo-convex pattern. Furthermore, the following equation (I) BL?ERL?BL+2×GL ??(Equation (I)) is satisfied in each of tracks, where BL represents a length of the recording element in a circumferential direction, GL represents a length of a gap between the recording elements in the circumferential direction, and ERL represents an effective recording length which is a length of an effective recording area ER in the circumferential direction, the effective recording area ER being created on a magnetic recording medium by a heating head and a recording head.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region, where M is a natural number of two or higher. Each burst pattern is formed so as to include two types of burst signal units that are positioned at different distances from a center of data track patterns and have an equal length along a radial direction of the substrate. The length along the radial direction is (2·M/N) times the track pitch, where N is a natural number of two or higher.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region, where M is a natural number of two or higher. Each burst pattern is formed so as to include two types of burst signal units that are positioned at different distances from a center of data track patterns and have an equal length along a radial direction of the substrate. The length along the radial direction is (2·M/N) times the track pitch, where N is a natural number of two or higher.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region, where M is a natural number of two or higher. Each burst pattern is formed so as to include two types of burst signal units that are positioned at different distances from a center of data track patterns and have an equal length along a radial direction of the substrate. The length along the radial direction is (2·M/N) times the track pitch, where N is a natural number of two or higher.

Abstract: On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region, where M is a natural number of two or higher. Each burst pattern is formed so as to include two types of burst signal units that are positioned at different distances from a center of data track patterns and have an equal length along a radial direction of the substrate. The length along the radial direction is (2·M/N) times the track pitch, where N is a natural number of two or higher.

Abstract: The magnetic recording and reproducing apparatus includes: a perpendicular recording magnetic recording medium including a track pattern including track portions and gap portions arranged so as to be alternately adjacent to each other in a cross-track direction, at least part of portions corresponding to the track portions being recording areas having the width substantially the same as the width of the track portions, portions between the recording areas being non-recording areas; and a magnetic head of a perpendicular recording type for applying a recording magnetic field to the recording areas. The anisotropic magnetic field Hk (T) of the recording areas of the magnetic recording medium and the recording magnetic field intensity Fw (t) of the recording magnetic field at the upper surface of the recording areas satisfy the following inequality (I): 0.23×Fw+1.2?Hk?0.26×Fw+1.6.

Abstract: A reliable magnetic recording medium is provided which comprises a servo signal unit portions formed in a concavo-convex shape, easily produced, and resistant to tracking error. Also provided are a magnetic recording/reproducing apparatus which incorporates the magnetic recording medium, and a stamper for manufacturing the magnetic recording medium with efficiency. The magnetic recording medium includes a recording layer divided into a plurality of data areas and a plurality of servo areas to record information. The recording layer is formed in a concavo-convex shape in each servo area, with a servo signal unit portions formed as either a convex portions or a concave portions of the concavo-convex shape. Of the servo signal unit portions, the burst signal unit portion for tracking is generally elliptical in shape when viewed from the direction of thickness.

Abstract: A magnetic recording-reproducing apparatus includes: a magnetic recording medium in which portions corresponding to track portions serve as recording areas and in which portions between the recording areas serve as non-recording areas; and a magnetic head having a main pole and a side shield disposed on both sides of the main pole in a cross-track direction. In the magnetic recording-reproducing apparatus, following inequality (I) is satisfied: S>Tw/2+Gw ??(I) where Tw is a track width, Gw is a gap width, and S is a distance between the center of the main pole of the magnetic head and an edge on the main pole side of each of the side shields.

Abstract: A magnetic recording medium which has a high areal density and reduced power consumption for recording operations, and a magnetic recording device incorporating the magnetic recording medium. The magnetic recording medium has an upper soft magnetic layer formed uniformly along a plane including the upper surface of a recording layer over the convex and concave portions of a concavo-convex pattern in the recording layer.

Abstract: A magnetic recording and reproducing apparatus and a method of controlling the same, capable of increasing the output of a position control signal and performing a precise positioning control of a magnetic head. The magnetic recording and reproducing apparatus has: a magnetic recording medium on which a positional information is recorded in the form of burst signal groups each consisting of either one of a single concave portion and a single convex portion of a predetermined concavo-convex pattern formed of a magnetic layer; a gate circuit; and an integrator for calculating a area integral of a reproduced signal corresponding to each of the burst signal groups.

Abstract: A magnetic recording and reproducing apparatus has a magnetic recording medium onto which servo information including position information is recorded by a concavo-convex pattern formed by a magnetic layer and a signal processing circuit that generates position control signal of a magnetic head based on amplitude values of fundamental wave component and at least one harmonic component in a reproduced signal of the position information. This magnetic recording and reproducing apparatus can increase the output of the position control signal and also increase the accuracy of the positioning control of the magnetic head.

Abstract: A concave/convex pattern forming method which makes it possible to easily press a stamper against a resin layer, and sufficiently maintain the shape of the concave/convex pattern after removing the stamper. During a resin layer forming process, the resin layer is formed using a resin material having a glass transition temperature higher than room temperature. During a pressing process, temperature control is performed such that temperatures of a substrate, the resin layer, and the stamper become higher than the glass transition temperature of the resin material by not less than 5° C. During a removing process, temperature control is performed such that temperatures of the substrate, the resin layer, and the stamper become not higher than a temperature 20° C. higher than the glass transition temperature of the resin material, and are equal or approximately equal to the temperatures of the substrate, the resin layer, and the stamper during the pressing process.

Abstract: A magnetic recording and reproducing apparatus includes: a magnetic recording medium onto which servo information including position information is recorded by a plurality of concavo-convex patterns formed by a magnetic layer; a gate circuit that extracts a part of a reproducing signal of the concavo-convex patterns by removing an end of a signal corresponding to a concave portion or a convex portion of the concavo-convex patterns from the reproducing signal; a first integrator that obtains area integral of an extracted reproducing signal; and a second integrator that adds respective signals after area integral is obtained to each other to generate a position control signal for controlling a position of a magnetic head. Thus, the magnetic recording and reproducing apparatus can make an output of the position control signal larger and can perform positioning control for the magnetic head with high precision.

Abstract: The magnetic recording and reproducing device has a magnetic recording medium, a recording head for writing magnetic data on the magnetic recording medium, and a reproducing head for reading magnetic data from the magnetic recording medium. In the magnetic recording medium, each track is formed by a convex portion with a predetermined track width, and a plurality of the tracks are arranged in parallel at intervals of a predetermined track gap. The relationship represented by the following formula (I) is satisfied: {Tw+(2×Tg)}/1.2?MWw??(I) wherein Tw represents the track width, Tg represents the track gap, and MWw represents the magnetic write width of the recording head.

Abstract: A mask forming method forms a concave/convex pattern in a mask when the mask is formed over a substrate. A coating film forming process forms a coating film by applying a radiation-curing coating composition onto the substrate. A radiation irradiating process then irradiates the coating film with radiation. Finally, a pattern transferring process presses a surface of a stamper on which a concave/convex pattern has been formed onto the coating film to transfer the concave/convex pattern to the coating film.

Abstract: A magnetic recording and reproducing apparatus includes a separator and first and second amplifiers. The separator separates a servo data signal and a user data signal, both reproduced by a reproducing head. The first and second amplifiers are connected to the output stage of the separator to increase the amplitude ratio of the servo data signal to the user data signal. The magnetic recording and reproducing apparatus can precisely decode the servo data along with the user data, and can achieve a highly precise servo control.