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Information recording medium tray, tray intermediate, and information recording medium substrate
PendingCN120937077ABase layers for recording layersDisk carriersYoung's modulusMechanical engineering
An information recording medium disc according to an embodiment is a disc having a plate thickness of 0.51 mm or less, and is provided with a substrate and a cover layer. The substrate has one main surface and another main surface, and also has a side wall surface connecting the two main surfaces. A cover layer covers both main surfaces and side wall surfaces of the substrate. The disk has a specific elastic modulus E / d [106 m2 / s2] of 40 or more as calculated from a Young's modulus E [GPa] and a density d [g / cm3]. When 30 [G] impact of 2 [m seconds is applied to the disk in the normal direction of the main surface of the disk substrate in a state in which the inner peripheral end of the disk is fixed, the maximum amplitude caused by vibration in the thickness direction of the outer peripheral end of the disk substrate is 0.25 mm or less.
Owner:HOYA CORPORATION
Alkali-free glass sheet
PendingUS20260070834A1Electrical apparatusBase layers for recording layersAlkali freePhysical chemistry
An alkali-free glass sheet according to the present invention contains, as a glass composition, in mol %, from 60% to 80% of SiO2, from 12% to 15% of Al2O3, from 1.2% to 4% of B2O3, from 0% to 0.5% of Li2O+Na2O+K2O, from 2% to 8% of MgO, from 2% to 11% of CaO, from 0% to 5% of SrO, from 0% to 5% of BaO, and from 10% to 16% of MgO+CaO+SrO+BaO, in which a mol % ratio B2O3 / Al2O3 is from 0.1 to 0.3, a mol % ratio (B2O3+BaO) / SiO2 is from 0.01 to 0.1, and MgO+CaO+SrO+BaO—Al2O3 is from −2% to +2%.
Owner:NIPPON ELECTRIC GLASS CO LTD
Aluminum alloy sheet for magnetic disk, aluminum alloy blank for magnetic disk, and aluminum alloy substrate for magnetic disk
To provide an aluminum alloy sheet for a magnetic disk, an aluminum alloy sheet blank for the magnetic disk, and an aluminum alloy sheet substrate for the magnetic disk, having satisfactory rigidity and capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy sheet for a magnetic disk, comprising: 0.1 to 7.0 mass% of Mg; 0.005 to 1.0 mass% of Cr; 3 to 100 mass ppm of Be; 0.20 mass% or less of Si; 0.05 to 5.9 mass% of at least one or more of Fe, Mn, and Ni in total; and a balance of Al and impurities.SELECTED DRAWING: None
Owner:KOBE STEEL LTD
Aluminum alloy disc blank for magnetic disc and magnetic disc
ActiveCN116568837BBase layers for recording layersMagnetic layer production by platingAluminium alloyMagnetic disks
The present invention relates to an aluminum alloy disc blank for a magnetic disc, characterized by being formed of an aluminum alloy containing Fe: 0.005 to 1.800 mass%, the balance consisting of Al and unavoidable impurities, and a flatness change of the aluminum alloy disc blank for a magnetic disc being 2.0 μm or less when the aluminum alloy disc blank for a magnetic disc is kept in the atmosphere at 50°C or lower for 336 hours.
Owner:UACJ CORP +1
Ultrafast pulse assisted magnetic recording
Described are systems, methods, and media for magnetic recording assisted by the use of ultrafast pulses such as ultrafast laser pulses. A layered magnetic medium includes a thin, magnetically softer capping layer disposed over a magnetically harder data recording layer. The capping layer is configured to have fast magnetization dynamics, and to have faster magnetization dynamics than the data recording layer. Due to the fast magnetization dynamics of the capping layer, ultrafast pulses can be used to assist a magnetic write field in magnetizing the capping layer without inducing any significant heating in the bulk of the media. The magnetization of the capping layer nucleates magnetization in the data recording layer under the influence of the magnetic write field.
Owner:SEAGATE TECH LLC
Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium, glass spacer for magnetic recording / reproducing device, and magnetic recording / reproducing device
To provide a glass for a magnetic recording medium substrate having excellent heat resistance and rigidity, a magnetic recording medium substrate made of the glass, a magnetic recording medium including the substrate, and a glass spacer for a magnetic recording device.SOLUTION: A glass for a magnetic recording medium substrate is an amorphous oxide glass having a SiO2 content of 56 to 80 mol%, a Li2O content of 1 to 10 mol%, a B2O3 content of 0 to 4 mol%, a total content of MgO and CaO (MgO+CaO) of 9 to 40 mol%, a specific gravity of 2.75 g / cm3 or less, a glass transition temperature of 650°C or more, and a Young's modulus of 90 GPa or more.SELECTED DRAWING: None
Owner:HOYA CORPORATION
Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
A fluorine-containing ether compound represented by formula (1). R < 1 >-O-CH < 2 >-R < 2 >-CH < 2 >-O-R < 3 > (R < 2 > is a perfluoropolyether chain. R1 is a formula (2-1) or a formula (2-2). And R3 is an organic group having at least one polar group and having 2-65 carbon atoms. In formula (2-1), X1 is a divalent linking group having 1-40 carbon atoms. Y1 and Z1 are organic groups with 1-12 carbon atoms or hydrogen atoms. At least one of X1, Y1, and Z1 contains a primary hydroxyl group. In the formula (2-2), X2 is a divalent linking group having 1-40 carbon atoms. And Y2 is an organic group with 1-12 carbon atoms or a hydrogen atom. And Z2 is an organic group with a carbon atom number of 1-12. And at least one of X2, Y2, and Z2 contains a primary hydroxyl group. )
Owner:RESONAC CORP
Magnetic disk device
ActiveUS12562192B2Record information storageRecording/reproducing/erasing methodsEngineeringProcessing element
According to one embodiment, a magnetic disk device includes a disk, a write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period in which the write processing is executed on the second data track, the correction limit prediction unit is capable of determining whether or not data of each of the target sectors of the first data track is damaged, and generates prediction information, and the determination unit determines whether or not to cause the write processing unit to continue the write processing on the second data track based on the prediction information.
Owner:KK TOSHIBA +1
Magnetic recording medium and magnetic storage device
To provide a method for producing a magnetic recording medium capable of having a magnetic layer with high crystal orientation and few defects, a magnetic recording medium, and a magnetic storage device.SOLUTION: A method of producing a magnetic recording medium 1 includes: a step of forming a magnesium oxide underlayer 20 on a surface of a substrate 10 by a sputtering method with using a target containing magnesium oxide; and a step of forming a magnetic layer 30 on the surface side of the magnesium oxide underlayer 20, in which the target containing the magnesium oxide is heated to more than 600°C when forming the magnesium oxide underlayer 20.SELECTED DRAWING: Figure 1
Owner:RESONAC HARD DISK CORP +1
Fluorine-containing ether compound, coated product, lubricant for magnetic recording medium, and magnetic recording medium
PCT designated stageWO2025220682A1Organic chemistryProtective coatings for layersEnd-groupPerfluoropolyether
This fluorine-containing ether compound is represented by R1-R2-Y-(CH2)z-O-CH2-R3[-CH2-R4-CH2-R3]x-CH2-O-(CH2)z-Y-R5-R6 (x is 0-1; z is an integer of 2-10; Y is any of O, NH, or S; R3 is a perfluoropolyether chain; R4 is a divalent linking group having 1-3 hydroxyl groups and having oxygen atoms at both ends; R2 is formula (2-1) or (2-2); R5 is formula (2-3) or (2-4); and R1 and R6 are end groups.).
Owner:RESONAC CORP
Spacer and hard disk drive device
Owner:HOYA CORPORATION
Aluminum alloy disc blank for magnetic disc and magnetic disc
ActiveCN116547398BControl the amount of Mgreduce conductivityLiquid applicationBase layers for recording layersElectro conductivityAluminium alloy
The present invention relates to an aluminum alloy disc blank for a magnetic disc, characterized by being formed of an aluminum alloy containing Mg: 3.40 to 3.90 mass%, the balance consisting of Al and unavoidable impurities, the aluminum alloy disc blank for a magnetic disc having an electrical conductivity of 36.0% IACS or more.
Owner:UACJ CORP +1
Substrate for magnetic disk and magnetic disk using the same
ActiveCN115812238BBase layers for recording layersRecord information storageCondensed matter physicsMaterials science
A substrate for a magnetic disk, characterized by being composed of an aluminum alloy containing one or two or more of Fe: 8.5 mass% or less, Mn: 2.5 mass% or less, Ni: 6.5 mass% or less, and Mg: 4.5 mass% or less, with the remainder composed of Al and unavoidable impurities, a resonance frequency being f (Hz), a density being p (g / cm 3 ), and a plate thickness being t (mm), (f x p / t) being 3800 or more, and a magnetic disk using the substrate for a magnetic disk.
Owner:UACJ CORP +1
Sputtering target for magnetic recording medium
PendingCN122095123AMagnetic materials for record carriersVacuum evaporation coatingPhysical chemistryThin membrane
The present invention relates to a sputtering target for a magnetic recording medium containing Co and Pt as metal components and containing at least one oxide. In the present invention, as an essential oxide for improving magnetic separation, tungsten oxide and / or molybdenum oxide is contained, and the content of the essential oxide is 15 vol% or less. As the oxide in the sputtering target, other oxides such as B2O3 can also be contained as optional oxides, and in this case, the total oxide content is preferably 20 vol% or more and 50 vol% or less. In the present invention, by applying the essential oxide, the total oxide content can be appropriately set while ensuring magnetic separation. According to the present invention, a granular thin film composed of a CoPt-based alloy having good magnetic separation can be formed.
Owner:TANAKA KIKINZOKU KOGYO KK
Magnetic disk drive
The present invention provides a magnetic disk device that can improve the recording density of data on the disk and suppress the degradation of write performance. [Solution] During the first write period, if the determination unit 67 determines that the error correction of the first user data on the first data track has not exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the second management. If the determination unit 67 determines that the above error correction has exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the third management. During or after the first write period, the determination unit 67 instructs the management unit 65 to perform the process of saving the data belonging to the third group to a non-volatile recording medium.
Owner:KK TOSHIBA +1
Method for manufacturing magnetic recording medium
The invention provides a method for manufacturing a magnetic recording medium capable of improving the productivity of the magnetic recording medium. This method for manufacturing a magnetic recording medium comprises: a finishing step for finishing the surface of a laminated body in which a magnetic recording layer and a protective layer are laminated in this order on a substrate by means of an abrasive material, said finishing step comprising: using a long abrasive tape in a state in which the abrasive tape is wound into a roll; and a scraping step for scraping the surface of the laminated body by pressing the abrasive tape, which is supplied from the state of being wound into the roll shape and in which abrasive grains are adhered to a support as the abrasive material, on the surface of the laminated body, using the abrasive tape from which free abrasive grains have been removed by being rewound in advance, and scraping the surface of the laminated body by pressing the abrasive tape on the surface of the laminated body. And the grinding belt is wound into the roll shape.
Owner:LISSENNOCO HARD DRIVE CO LTD
Magnetic disk device
PendingCN121662091AError detection/correctionRecord information storageManagement unitSoftware engineering
The embodiment of the invention relates to a magnetic disk device. In the first writing period, if the determination unit (67) determines that the error correction of the first user data on the first data track does not exceed the limit, the determination unit (67) causes the write processing unit (62) to continue the write processing and causes the management unit (65) to execute the second management. When the determination unit (67) determines that the error correction has exceeded the limit, the determination unit (67) causes the write processing unit (62) to continue the write processing and causes the management unit (65) to execute the third management. The determination unit (67) causes the management unit (65) to execute a process for transferring the data belonging to the third group to the non-volatile recording medium during or after the first writing period.
Owner:KK TOSHIBA +1
Aluminum alloy substrate for magnetic disk and magnetic disk using said aluminum alloy substrate for magnetic disk
To provide an aluminum alloy substrate for magnetic disks that achieves excellent impact resistance and energy saving, and a magnetic disk including the same.SOLUTION: An aluminum alloy substrate for magnetic disks contains an aluminum alloy containing Mg: 1.00-3.50 mass%, with the balance being Al and inevitable impurities, the aluminum alloy substrate having a Young's modulus of 68.7 GPa or more and a density of 2.72 g / cm3 or less. A magnetic disks has, on the surface of the aluminum alloy substrate for magnetic disks, an electroless Ni-P plated layer, and a magnetic layer over the electroless Ni-P plated layer.SELECTED DRAWING: Figure 1
Owner:UACJ CORP +1
Magnetic disk substrate, magnetic disk, and hard disk drive
ActiveJP7809741B2Edge grinding machinesBase layers for recording layersHard disc driveCondensed matter physics
To provide a substrate for a magnetic disk, a magnetic disk, an annular-shaped substrate, and a manufacturing method for a substrate for a magnetic disk, to make it difficult for the annular-shaped substrate from a holding member that holds the annular-shaped substrate when double-sided grinding or polishing is performed on the annular-shaped substrate.SOLUTION: A glass substrate for a magnetic disk (magnetic disk substrate) 1 includes a pair of main surface 1p and outer peripheral end surface 5, the outer peripheral end surface has a pair of chamfered surfaces 1c, each of which is connected to the main surface, and a side wall surface 1t extending between the pair of chamfered surfaces and curved outwardly so as to be convex, and the side wall surface 1t has a radius of curvature Rt of 1100 μm or more in a cross-section along the plate thickness T direction of the magnetic disk substrate. To prevent the generation of fine particles, it is preferable that the outer peripheral end surface of the magnetic disk substrate is smoothed. In addition, it is preferable to align the outer peripheral end surface to a target shape.SELECTED DRAWING: Figure 2
Owner:HOYA CORPORATION
Fluorine-containing ether compound, coating material, lubricant for magnetic recording medium, and magnetic recording medium
A fluorine-containing ether compound represented by the following formula. R 1 -CH2-R 2 [ -CH2-R 3 -CH2-R 2 ] x -CH2-R 4 (x is 1 or 2. R 2 is a perfluoropolyether chain. R 3 is a divalent linking group having 1 to 50 carbon atoms and 1 to 6 polar groups. x R 3 at least one of R 1 and R 4 are terminal groups having 1 to 50 carbon atoms and 1 to 4 polar groups. X and Y are each independently an acyclic divalent saturated hydrocarbon group having 3 to 20 carbon atoms and 1 to 2 polar groups. a and b are each independently 0 or 1.
Owner:RESONAC CORP
Disk-shaped substrate processing device, disk-shaped substrate manufacturing system, disk-shaped substrate processing method, and disk-shaped substrate manufacturing method
PCT designated stageWO2026009587A1Base layers for recording layersLapping machinesCircular discManufacturing systems
Provided is a disk-shaped substrate processing device for performing processing at the time of manufacturing disk-shaped substrates, the processing device having a determination unit that determines a bending direction of each of the disk-shaped substrates, and an inversion unit that aligns the bending directions of the plurality of disk-shaped substrates on the basis of the determination by the determination unit.
Owner:RESONAC HARD DISK CORP
Disks for information recording media, and disk intermediates
PendingJPWO2024202050A5Base layers for recording layersDisk carriersComputer hardwareMechanical engineering
A disk for an information recording medium according to an embodiment has a plate thickness of 0.51 mm or less, and comprises a substrate and a coating layer. The substrate has one main surface and another main surface, and also has sidewall surfaces which connect the two main surfaces. The coating layer covers both main surfaces and the sidewall surfaces of the substrate. The disk has a specific modulus of elasticity E / d [×106m2 / s2], which is calculated from the Young's modulus E[GPa] and density d[g / cm3] thereof, of 40 or more. When the disc is subjected to an impact of 30 [G] at 2 [m / sec.] in the normal direction of the main surfaces of the disk substrate while the inner peripheral end section of the disk is fixed, the maximum amplitude of the outer peripheral end section of the disk substrate caused by vibrations in the plate thickness direction is 0.25 mm or less.
Method for manufacturing magnetic recording medium
PendingUS20250364010A1Belt grinding machinesRecord information storageRecording layerProtection layer
A method for manufacturing a magnetic recording medium includes burnishing a surface of a laminated structure using an abrasive material, the laminated structure including a magnetic recording layer and a protective layer successively laminated on a substrate. The burnishing includes using a long abrasive tape including abrasive grains as the abrasive material fixed on a support in a state wound in a roll shape, and pressing the abrasive tape supplied from the state wound in the roll shape against the surface of the laminated structure, thereby abrading the surface of the laminated structure. The abrasive tape in the state wound in the roll shape is re-rolled in advance to remove loose abrasive grains therefrom.
Owner:RESONAC HARD DISK CORP
Magnetic recording device and layered structure
PCT designated stageWO2025206376A1Base layers for recording layersRecord information storageDisk packRecording layer
Provided is a magnetic recording device, said magnetic recording device comprising a plurality of magnetic disks which each include a substrate and a magnetic recording layer formed on the substrate and a spacer which is disposed between the plurality of magnetic disks and which is for stacking the magnetic disks with a prescribed interval therebetween, wherein after a thermal shock test, the change in the flatness of the magnetic disks is not more than 5.0 μm. In the thermal shock test, a temperature raising and lowering program in which, inside a thermal shock device, the magnetic recording device is kept at 70°C for 30 minutes, subsequently cooled to -40°C over two minutes and kept at -40°C for 30 minutes, and then increased in temperature to 70°C over two minutes is repeated for five cycles.
Owner:HOYA CORPORATION
Magnetic disk device
PendingCN120783805ARecord information storageRecording/reproducing/erasing methodsSoftware engineeringMechanical engineering
The embodiment of the invention relates to a magnetic disk device. A magnetic disk device is provided with a disk (DK), a write head (WHD), a write processing unit (62), an error correction unit (64), a correction limit prediction unit (65), and a determination unit (66). The correction limit prediction unit (65) is capable of determining whether or not data in each of the target sectors of the first data track is corrupted during a write period during which write processing is performed on the second data track, and generates prediction information before write processing is completed on all of the target sectors of the second data track. The determination unit (66) determines whether or not to cause the write processing unit (62) to continue write processing on the second data track on the basis of the prediction information.
Owner:KK TOSHIBA +1
Aluminum alloy disk material, method for manufacturing aluminum alloy raw material, method for manufacturing aluminum alloy ingot, method for manufacturing aluminum alloy plate, method for manufacturing aluminum alloy substrate for plating, method for manufacturing aluminum alloy substrate for magnetic disk, method for manufacturing magnetic disk, and magnetic disk
PendingCN121713238ABase layers for recording layersLiquid/solution decomposition chemical coatingAlloy substrateIngot
The present invention relates to an aluminum alloy disc material (1) having a peeling surface formed by peeling a base layer from at least one recycled material selected from a finished product and an intermediate material provided with an aluminum alloy disc and the base layer containing Ni, the aluminum alloy disc material (1) having an oxide coating (10) on the surface of the peeling surface.
Owner:UACJ CORP +1
Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
This fluorine-containing ether compound is represented by the following formula. R1-CH2-R2(-CH2-R3-CH2-R2)x-CH2-R4 (In the formula, x represents an integer of 1 or 2; R2 represents a perfluoropolyether chain; R3 is represented by formula (2); and R1 and R4 each represent a terminal group which has 1 to 4 polar groups and 1 to 50 carbon atoms.)
Owner:RESONAC CORP
Alkali-free glass plate
To provide an alkali-free glass panel that has excellent productivity and also has sufficiently high strain points and Young's moduli.SOLUTION: An alkali-free glass panel has a glass composition containing, in mol%, SiO2 64-72%, Al2O3 11-15%, B2O3 0-4%, Li2O+Na2O+K2O 0-0.5%, MgO 5-12%, CaO 7-12%, SrO 0-1%, BaO 0-1%, and MgO+CaO+SrO+BaO 15-19% with the mol% ratio B2O3 / Al2O3 of 0.1-0.4 and the mol% ratio MgO / CaO of 0.1-1.5.SELECTED DRAWING: Figure 1
Owner:NIPPON ELECTRIC GLASS CO LTD
Glass plate for manufacturing magnetic recording media and method for manufacturing magnetic recording media
ActiveJP7784573B2Base layers for recording layersRecord information storageMechanical engineeringGlass sheet
A glass plate configured to be cut into glass substrates for magnetic recording disks is described. The glass plate includes a first surface. For surface features of the first surface having a characteristic wavelength of 60 to 500 micrometers (μm), the root mean square of the surface topography of the surface features determined using surface analysis on the first surface with incident light and reflected light is given as microwaviness. The maximum value of the microwaviness of any region of the first surface may be greater than or equal to 1.2 nanometers (nm) and less than or equal to 2.8 nm. After the surface analysis, the glass plate may be cut into glass substrates in response to determining that the maximum value of the microwaviness is within the range. Further, a method of manufacturing glass substrates from the glass plate is described.
Owner:WESTERN DIGITAL TECHNOLOGIES INC
Method of manufacturing magnetic recording medium and magnetic recording and reproducing apparatus
To provide a manufacturing method of a magnetic recording medium capable of further increasing the recording density by enhancing the perpendicular orientation of a magnetic recording layer, and to provide a magnetic recording and reproducing device equipped with the magnetic recording medium manufactured by the manufacturing method.SOLUTION: A method of manufacturing a magnetic recording medium according to the present invention is a method of manufacturing a magnetic recording medium including, on a non-magnetic substrate, an underlayer, a seed layer, and a magnetic recording layer in this order, wherein the seed layer is formed by forming a film containing two elements of an element α and an element β such that the element α mainly forms a columnar crystal having an fcc structure and the element β mainly forms an amorphous structure, and then etching a surface of the film to form a surface in which the element α and the element β are phase-separated from each other.SELECTED DRAWING: Figure 1
Owner:RESONAC HARD DISK CORP