177results about "Disk carriers" patented technology

According to one embodiment, a disk device includes a disk-shaped recording medium, an actuator assembly provided to be rotatable and supporting a magnetic head, and a first stopper and a second stopper, arranged contactable with the actuator assembly. At least one of the first stopper and the second stopper includes a cushioning member having a contact surface contactable with the actuator assembly, and a gas adsorption member provided to surround the cushioning member except for the contact surface.

To provide an aluminum alloy plate for a magnetic disk, an aluminum alloy plate blank for a magnetic disk, and an aluminum alloy plate substrate for a magnetic disk, which have good rigidity and are capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy plate for a magnetic disk contains 0.1-7.0 mass % of Mg, 0.005-1.0 mass % of Cr, 3-100 mass ppm of Be, Mn, 100 mass ppm or less of Ti, and 0.20 mass % or less of Si. The total of at least one or more of Fe, Mn, and Ni is 0.03-5.9 mass %, and the remainder comprises Al and impurities. The solid-soluble amount of Mn in an aluminum parent phase is 0.03 mass % or more.SELECTED DRAWING: None

To provide a film-forming device capable of stabilizing a film thickness distribution of a protective film.SOLUTION: A film-forming device according to the present invention includes: a film-forming chamber; a holder for holding a substrate inside the film-forming chamber; an inlet pipe for introducing a carbon-containing source gas into the film-forming chamber; a cathode electrode with a filament shape; a first power supply that heats the cathode electrode by applying current; an anode electrode provided around the cathode electrode; a second power supply that generates a discharge between the cathode electrode and the anode electrode; a third power supply that applies the potential difference between the cathode electrode or the anode electrode and the substrate; an ionization region, in which the gas is ionized by the discharge; and an acceleration region, in which the ionized gas is accelerated by the potential difference, in which a soft magnetic cylinder is provided around the acceleration region.SELECTED DRAWING: Figure 1

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.

A glass substrate for a magnetic recording medium of the present invention has an average coefficient of linear thermal expansion within a temperature range of from 30° C. to 380° C. of from 30×10−7 / ° C. to 40×10−7 / ° C., a Young's modulus of 80 GPa or more, a specific Young's modulus of 30 GPa / g·cm−3 or more, and a strain point of 700° C. or more.

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%.

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

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.

Disclosed is a fluorine-containing ether compound which is represented by the formula shown below. R1-O-CH2-R2-(CH2-R3-CH2-R2)n-CH2-O-R4 (In the formula, R1 is formula (2-1) or formula (2-2). R2 represents a perfluoropolyether chain. R4 represents an organic group that has at least one polar group and 1 to 50 carbon atoms. R3 represents a divalent linking group that has at least one hydroxyl group. n is an integer of 0 to 2.)

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.

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

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. )

The present disclosure provides a disk device capable of suppressing failure due to exhaust and improving reliability. According to one embodiment, a disk device includes: a disk-shaped recording medium; an actuator assembly provided in a rotatable manner; a magnetic head supported on the actuator assembly; and a first stopper and a second stopper disposed so as to be capable of abutting against the actuator assembly. At least one of the first stopper and the second stopper is provided with: a buffer member having a contact surface capable of coming into contact with the actuator assembly; and a gas-adsorbing material provided so as to surround a portion of the buffer member other than the contact surface.

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.

To provide an aluminum alloy plate for a magnetic disk, an aluminum alloy plate blank for a magnetic disk, and an aluminum alloy plate substrate for a magnetic disk, which have good grindability and are capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy plate for a magnetic disk contains 0.1-7.0 mass % of Mg, 0.005-1.0 mass % of Cr, 3-100 mass ppm of Be, 100 mass ppm or less of Zr, and 0.20 mass % or less of Si. The total of at least one or more of Fe, Mn, and Ni is 0.05-3.0 mass %, and the remainder comprises Al and impurities. The area ratio of an intermetallic compound on a surface is 0.10-40%, and the area ratio is calculated for an intermetallic compound having a maximum length of 0.33 μm or more.SELECTED DRAWING: None

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

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.).

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.

To provide a disk device capable of improving the strength of coupling between an end surface of a base and an outer cover.SOLUTION: A disk device according to one embodiment includes a magnetic disc, a base, a film, an inner cover, and an outer cover. The base is provided with an inner space and has: a first inner surface that surrounds the magnetic disk; a support surface that is connected to an end of the first inner surface in a first direction; a second inner surface that is more separated from a rotation axis of the magnetic disk than the first inner surface and is also connected to the support surface; and an end surface that is connected to an end of the second inner surface in the first direction. The film covers a coating region included in the second inner surface and is separated from the end surface and an exposure region included in the second inner surface and aligned with the coating region around the rotation axis. The inner cover is supported on the support surface and is surrounded with the second inner surface. The outer cover is at least partially coupled to the base.SELECTED DRAWING: Figure 1

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.

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.

Disclosed is a fluorine-containing ether compound which is represented by the formula shown below. R1-O-CH2-R2-(CH2-R3-CH2-R2)n-CH2-O-R4 (In the formula, R1 is formula (2-1) or formula (2-2). R2 represents a perfluoropolyether chain. R4 represents an organic group that has at least one polar group and 1 to 50 carbon atoms. R3 represents a divalent linking group that has at least one hydroxyl group. n is an integer of 0 to 2.)

To provide a disk device capable of improving reliability by suppressing a failure caused by outgas.SOLUTION: According to an embodiment, a disk device includes a disk-like recording medium, an actuator assembly rotatably provided, a magnetic head supported by the actuator assembly, and a first stopper and a second stopper disposed so as to be able to abut on the actuator assembly. At least one of the first stopper and the second stopper includes a buffer member having an abutting surface capable of abutting on the actuator assembly, and a gas adsorbent provided to surround the buffer member except for the abutting surface.SELECTED DRAWING: Figure 3

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.

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.

Provided is a fluorine-containing ether compound represented by the following formula. R1—R2—CH2—R3[—CH2—R4—CH2—R3]n—CH2—R5—R6 (n represents an integer of 0 to 2, R3 represents a perfluoropolyether chain, R4, R2, and R5 represent a divalent linking group having one or more polar groups, R2 and R5 have an oxygen atom at an end bonded to R1 or R6, R1 and R6 represent an organic group having 1 to 50 carbon atoms or a hydrogen atom, at least one of R1 or R6 is represented by Formula (2), one of X and Y represents C═O, and the other represents —NH—, —NR7— (R7 represents a hydrocarbon group having 1 to 8 carbon atoms), or —O—, Q represents a 5- to 8-membered heterocyclic ring structure, which is formed of a carbon atom of a linking group indicated by a dashed arc together with X and Y, and Z represents 0 to 5 substituents.)

Provided is a disk device capable of improving the bonding strength between an end surface of a base and a housing. A disk device according to an embodiment includes a magnetic disk, a base, a film, an inner cover, and an outer cover. The base body is provided with an internal space; the magnetic disk includes a first inner surface surrounding the magnetic disk, a support surface connected to an end of the first inner surface in a first direction, a second inner surface farther from a rotation axis of the magnetic disk than the first inner surface and connected to the support surface, and an end surface connected to an end of the second inner surface in the first direction. The film covers a covered region in the second inner surface, and is separated from the end surface and an exposed region in the second inner surface, the exposed region being aligned with the covered region around the rotation axis. The inner cover is supported by the support surface and surrounded by the second inner surface. And the outer cover is combined with at least one part of the base body.

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.

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