Matches 401 - 450 out of 1104 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >
Match Document Document Title
5521781 Substrate for magnetic recording medium  
Proposed is a substrate of a magnetic recording medium in the form of an annular disk made from a single crystal of silicon which is imparted with greatly improved mechanical strengths to withstand...
5520981 Magnetic recording disk with overcoat thickness gradient between a data zone and a landing zone  
An improvement in a magnetic recording disc having a protective overcoat is described. The overcoat extends between an inner-diameter landing zone and a data zone and has a thickness in the landing...
5514468 Magneto-optical recording medium  
A magneto-optical recording medium having a layered structure consisting of a first dielectric layer, magnetic recording layer, second dielectric layer and reflecting layer successively formed on a...
5512364 Magneto-optical recording medium  
In the magneto-optical recording medium with a transparent substrate, a film of dielectric indium oxide, tin oxide or metallic Ti is interposed between the substrate and the recording layer, to...
5508077 Textured disc substrate and method  
A disc substrate having a selected roughness gradient from an inner-diameter region to an outer-diameter region, and a method of producing the texturing on the substrate are disclosed. The method...
5504735 Information recording disk having a stepped central recess and hub configuration  
An information recording disk formed from two substrates with a stepped central opening for receiving a hub within the stepped recess of at least one of the substrates is provided. In one...
5504646 Magnetic disk including protective layer having surface with protusions and magnetic disk apparatus including the magnetic disk  
There is provided a magnetic disk apparatus comprising: at least one magnetic disk having a magnetic layer and a surface protective layer on a substrate; a magnetic head which faces the magnetic...
5488519 Recording and reproducing device having conductive spindle  
A recording and reproducing device having electro-conductive layers corresponding to track patterns arranged on a recording medium. A slider member of a head is provided with at least a pair of...
5487931 Rigid disc substrate comprising a central hard core substrate with a hard, thermally and mechanically matched overlying smoothing layer and method for making the same  
A rigid magnetic memory disc(28) is disclosed having a substantially flat, central hard core substrate(12) and an overlying smoothing layer(14) deposited thereon. The smoothing layer(14) is...
5486395 Magneto-optical disk  
A magneto optical disk comprising: a circular substrate; a recording layer, formed on the substrate, for magneto-optical recording of information; a readout layer, formed between the substrate and...
5480695 Ceramic substrates and magnetic data storage components prepared therefrom  
Substrates are disclosed having an ultra-smooth surface finish thereon rendering them useful in making high density magnetic storage components, such as a computer hard disk or thin-film head which...
5478622 Magnetic disk  
A magnetic disk includes two kinds of texture lines formed on a substrate rendered to texturing, one kind being formed over the entire substrate and parallel with a circumference of the substrate...
5477528 Magneto-optical disk and the reproducing method thereof  
A magneto-optical disk, which possesses a disc-shaped substrate and a recording layer composed of a perpendicular magnetization film that is formed on the substrate, characterized in having: an...
5476700 Disc base and mold for molding the disc base  
A disc base formed concentrically in the recited order from its center opening to its outer circumferential edge with clamp areas on its two faces, a groove by a stamper holder and a signal area...
5465381 Processor and read/write head incorporated in disk for communicating data to host directly from processor read/write head to read/write head of host disk drive  
A computer-based system, such as a value printing system, has a host data processor having at least one disk drive that includes a first read/write head for reading data from and for writing data...
5465184 Hard disc drives and read/write heads formed from highly thermally conductive silicon carbide  
Silicon carbide is produced by chemical vapor deposition at temperatures from 1340°-1380° C., deposition chamber pressures of 180-200 torr, H 2 /methyltrichlorosilane ratio of 4-10 and...
5462823 Magnetic recording materials provided with a photosensitive layer  
Disclosed is a magnetic recording element comprising a support having coated on at least one major surface thereof a layer of a magnetic recording medium and a photosensitive layer which may be...
5458940 Optical disk with vibration dampening  
A single recording side magneto-optic disk has improved dampening characteristics for rotation at high speeds such as 3,000 rpm or greater. A dampening layer is secured to the recording side. The...
5455093 Flexible magnetic disk and process for preparing the same  
A flexible magnetic disk is disclosed, which comprises a non-magnetic support having thereon a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin, and a magnetic layer...
5450379 Information storage medium, method of fabricating same, and drive unit for such medium  
An information storage medium having both a read-only optical storage portion and a magnetic storage portion that can be written and read is provided. There is also disclosed a drive unit for use...
5447768 Optical disk with a bearing ring  
A bearing ring for an optical disk has sufficiently high firmness and satisfactory sliding properties. The ring is formed by cutting a laminate structure comprising a first layer formed of a firm...
5442499 Method of detecting sector servo information in a disk system  
A method and apparatus for detecting sector servo information in a disk system, uses sector servo information with at least one auxiliary confirming code pattern provided in addition to...
5440474 Magnetic recording disk with equally-spaced servo sectors extending across multiple data bands  
A magnetic recording disk has servo sectors that are generally equally spaced on a given track and read during seek, settle, and track-following operations. An algorithm is used to determine the...
5438564 Magneto-optical disk hub in which the inner peripheral edge portion of the spindle opening is strengthened and made abrasion resistant  
An optical disc equipped with a hub having a centering hole into which a spindle shaft of a disc driving mechanism is inserted, wherein a centering hole portion of the hub is provided with a...
5432662 Data recording cartridge including a flexible magnetic recording medium  
A data recording cartridge provided with a cartridge case and a recording medium accommodated therein, wherein the cartridge case is molded from at least one of the following materials: (1)...
5430594 Magnetic recording medium  
There is provided a magnetic recording medium which is highly reliable so that tracking servo can be properly effected wherein Z≤0.49 is established when light reflectance on a data track is...
5427833 Magneto-optical recording medium and method for processing the surface  
A surface of a magneto-optical recording medium of the present invention is textured with fine and physical protrusions and recessions. The shapes of physical protrusions and recessions vary at...
5425988 Recording and reproducing device which includes a protective film and a monomolecular fluoro organo silicon film  
A recording and reproducing device is provided. The device comprises a recording medium, a head giving and receiving recording signals to or from the recording medium, and a mechanism section and a...
5423054 Processor and read/write head incorporated in disk for communicating data to host directly from processor read/write head to read/write head of host disk drive  
A computer-based system, such as a value printing system, has a host data processor having at least one disk drive that includes a first read/write head for reading data from and for writing data...
5419938 Magnetic recording medium comprising two magnetic layers of hexagonal ferrite magnetic particles and binder wherein the easy axes of the particle is specified  
A magnetic recording medium includes a coated type of magnetic layer containing magnetic powders substantially made up of hexagonal ferrite particles and a binder, and has the values of SQR x ...
5418670 Magnetic recording medium having a servo pattern of the intermittent type with compensation for suppressing self-generated residual fields  
A magnetic recording medium has recorded thereon a series of discrete time-limited servo signal bursts. To suppress residual fields emanating from each servo signal burst, at least one half-cycle...
5402278 Method for recording a positioning signal on a magnetic recording disk and apparatus for recording the same  
This invention relates to a method for recording a positioning signal on a disk having a projection pattern. The method includes rotating a magnetic disk having a magnetic layer on a non-magnetic...
5400201 Servo burst pattern for removing offset caused by magnetic distortion and method associated therewith  
An alternating "A/B" servo burst pattern for measuring and compensating for offset of the track centerline due to differential magnetic influence to the servo pattern, and a switching network to...
5388020 Magnetic disk having improved surface configuration and magnetic disk unit including same  
There is disclosed a magnetic disk having a surface shape so designed as to satisfy flying characteristics and sliding characteristics in CSS and the head adhesion even in a high-density recording....
5383078 Magnetic disk assembly having a hub with a circular recess extending circumferentially along an outer peripheral edge thereof  
A magnetic disk comprises a flexible disk-shaped magnetic sheet with a magnetic layer formed on a substrate film and having an aperture in the center of the disk; a center hub made of metal sheet...
5383070 Method and device for measuring disk drive alignment  
A test disk is used to measure disk drive alignment and other parameters without removing the drive from its computer system and without any need for special test equipment. It includes a pair of...
5374463 Magnetic recording disk having a contiguous fullerene film and a protective overcoat  
A film comprising fullerene molecules or their derivatives, preferably C 60 or C 70 fullerene molecules, is used as a lubricating film between two bearing surfaces. In a particular embodiment, a...
5362941 Exhaust and particle wastes collecting device for laser etching  
The current invention provides an apparatus and method of collecting waste materials produced during laser etching of a floptical medium without blocking access to the medium surface. The invention...
RE34765 Recording medium annealing process  
Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the...
5355270 Magnetic recording medium having a reference track structure for improved optical tracking  
A magnetic recording medium in which the center of a magnetic head can be brought to a centerline of a reference track, thereby enhancing the reliability of the magnetic recording medium, the...
5353182 Magnetic disk unit having magnetic disks and a magnetic head with a head slider which is in contact with surfaces of the magnetic disk  
A magnetic disk includes a non-magnetic substrate with a surface processed layer having fine irregularities formed at least on a main surface thereof, and at least a thin film magnetic film and a...
5350618 Magnetic medium comprising a substrate having pits and grooves of specific shapes and depths  
A magnetic medium comprising a substrate formed with a stepped pit and a magnetic substance buried in the stepped pit. A method of manufacturing a magnetic medium comprising the steps of forming a...
5338608 Amorphous copolymers of two fluorinated ring monomers  
Copolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with perfluoro(butenyl vinyl ether) and, optionally, with a third comonomer are amorphous in all monomer proportions, and soluble in...
5331487 Direct access storage device with vapor phase lubricant system and a magnetic disk having a protective layer and immobile physically bonded lubricant layer  
A thin film magnetic recording disk that has a layer of lubricant bonded thereto is enclosed within a vapor phase lubricant system that operates to continuously apply lubricant vapors to the disk's...
5328740 Magneto-optical recording medium and method for processing the surface  
A surface of a magneto-optical recording medium of the present invention is textured with fine and physical protrusions and recessions. The shapes of physical protrusions and recessions vary at...
5326607 Amorphous carbon substrate for a magnetic disk and a method of manufacturing the same  
The surface of a blank for a textured amorphous carbon substrate is polished in a surface with a predetermined surface roughness, and then the blank with a polished surface is heated at a...
5322987 Pneumatic hub locking device for etching optical servo tracks on magnetic disks  
An apparatus for etching optical servo tracks on a magnetic storage disk comprises optics for generating a beam of light for etching the servo tracks and a spindle for rotating the disk in...
5319507 Recording/reproducing system using a flexible magnetic disk  
A magnetic recording/reproducing apparatus and method, the apparatus including a drive mechanism for driving a flexible magnetic disk loaded thereon to rotate, the magnetic disk being comprised of...
5317468 Magnetic disk having reserve servo sectors and plural reserve tracks  
Plural reserve servo sectors are provided to the outside of the outside and inside circumferences of the data recording track area of a sector servo type magnetic disk. Plural reserve tracks are...
5315579 Recording disk hub bond  
A hub secured to a substrate having a recording medium with a bond layer having a thickness of less than 1 millimeter. The bond layer bonds the hub with the substrate and includes a cross-linked...
Matches 401 - 450 out of 1104 < 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >