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4738885 |
Magnetic disk, substrate therefor and process for preparation thereof
Disclosed is a substrate for a magnetic disk, which comprises a ceramic substrate formed by subjecting a ceramic molded body to hot isostatic pressing in an inert atmosphere and subsequently to...
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4737877 |
Structure to provide optical and capacitive contrast on magnetic recording disk
A magnetic recording disk is formed on a rigid aluminum substrate coated with a polymeric dielectric layer. A thin film metallic position-indicating track is applied to the upper surface of the...
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4737869 |
Magnetic disk having data area and index servo area and servo system for positioning read/write head on magnetic disk
A magnetic disk comprises a data area and a single index servo sector area embedded in the data area. The servo sector has three or more servo information pattern sections formed side by side in...
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4734810 |
Magnetic recording medium comprising protrusion on its surface and a plasma treated substrate and recording/reproducing method therefor
A magnetic recording medium comprising a ferromagnetic metal thin film layer formed on one surface of a flexible non-magnetic substrate and primarily comprising cobalt and oxygen is improved in...
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4734796 |
Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
A method for prevention of unauthorized copying from information recording media, such as diskettes, comprising the steps of altering the information storage characteristics of the information...
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4729805 |
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...
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4725470 |
Magnetic disk medium
A magnetic disk medium having a magnetic layer formed on its substrate, is characterized in that in a portion of the substrate where a magnetic head runs is formed a concave groove in which a...
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4720329 |
Apparatus and method for the electrolytic plating of layers onto computer memory hard discs
An apparatus for electrolytic plating of computer memory discs comprising a plating container, a spindle, a prime mover, an anode, and an electrical transmission system. The plating container...
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4717977 |
High capacity Winchester disk drive
A digital storage system of the Winchester or hard disk drive type has the hard aluminum disks mounted around the drive motor. To accommodate the difference in thermal coefficients of expansion of...
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4716078 |
Substrate for a magnetic disc and method manufacturing same
A substrate for magnetic discs, which are to be used as external storage in data processors, is formed from glass-like carbon materials by themselves or contained in a thermosetting resin matrix....
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4711115 |
Method for forming memory discs by forging
A flat, smooth material, e.g., metal sheet, suitable for use as a disc substrate for applying a recording media thereto for data storage devices, and a method of making same, are disclosed. The...
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4707756 |
Perpendicular magnetic recording medium
Disclosed is a perpendicular magnetic recording medium wherein an underlayer made of a material containing Si and/or Ge as its principal ingredient is deposited on a substrate, and a perpendicular...
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4704650 |
Oriented sheet supports in a recording disc
A recording disc in which two recording sheets are bonded to bonding rings at the inner and outer periphery on both sides of a circular substrate with a recess between the recording portion of the...
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4704181 |
Apparatus for fabricating computer disks
The disk is aligned by means of a centering device that passes through the disk center hole and possesses a recessed region in its tip which mates with the convex center region of the hub. The hub...
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4704179 |
Process for producing magnetic discs
A process for producing a magnetic disc comprises (1) attaching a flexible disc having a magnetic layer coated thereon to at least one side of a base plate wherein a gap is formed between the back...
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4701881 |
Magneto-optical recording medium
A magneto-optical recording medium is disclosed in which a magnetic thin film recording layer is formed by a magnetic material having a Curie temperature or magnetic compensation temperature as low...
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4698716 |
Support for magnetic recording disk and its production process
The support for a magnetic recording disc according to the invention comprises a metal disk covered by an organic coating and, on the latter, a thin, hard coating of a material based on hydrous...
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4698715 |
Magnetic recording disk having center core secured by a base-less double-sided adhesive tape
A magnetic recording disk cartridge comprises a cartridge casing and a magnetic recording disk accommodated therein for rotation. The magnetic recording disk consists of an annular magnetic...
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4698251 |
Magnetic recording medium and method of producing the same
A magnetic disk or like magnetic recording medium having a magnetic layer provided on a non-magnetic substrate by dry-process or wet-process plating means and allowing a head to write and read data...
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4695512 |
Magnetic head for perpendicular magnetic recording
A magnetic head for perpendicular magnetic recording includes a pair of substrates consituted by a non-magnetic material and having their opposing surfaces respectively formed with heat-resistant...
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4694370 |
Magnetic disk cartridge
A magnetic disk cartridge containing a floppy magnetic disk is provided with center core which has a groove where the vertical part of the core meets the flange upon which the disk is fastened by a...
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4694358 |
Magneto-optic recording structure and method
A magnetic magneto-optic recording structure and method in which a magneto-optic active layer is positioned within the fringing magnetic field of a magnetic recording medium, the structure...
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4692831 |
Disc cartridge having positive isolation means when in storage
An improved disc cartridge (1) is disclosed, which comprises a case assembly (4) and an information recording disc (5) flatly rotatably housed in the case assembly. A disc holding mechanism is...
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4689260 |
Abrasion-resistant magnetic recording disk
A magnetic recording disk comprises a magnetic layer consisting of a binder and magnetic particles, a silicon substrate and abrasion-resistant material formed on the silicon substrate. The...
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4688130 |
Perpendicular magnetic recording medium and production process thereof
A perpendicular magnetic recording medium is formed of a substrate having 5×10 5 -5×10 9 fine projections per mm 2 on the surface thereof, said projections having heights in the range of...
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4687536 |
Apparatus for centering and attaching a reinforcing ring to a floppy disk
Apparatus for positioning and attaching a reinforcing ring in coaxial relationship to a floppy disk, includes a force translating mechanism mounted for movement to and from a resiliently mounted...
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4686592 |
Disk drive assembly
An improved disk drive device including a disk of recording media and having a central aperture, which disk is supported at its periphery by a cylindrical housing. A spindle motor is positioned at...
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4678722 |
Record member with metallic antifriction overcoat
A magnetic recording member with a thin metallic antifriction protection overcoat formed over a magnetic layer. The overcoat is soft ductile and low stress and includes a metal selected from the...
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4675239 |
Perpendicular magnetization film
A perpendicular magnetization amorphous thin film of an alloy of samarium, cobalt and bismuth having an easy magnetizing axis perpendicular to a plane of substrate, and the preparation thereof....
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4672488 |
Spindle hub-disc interface
To overcome problems of precise permanent location of aluminum Winchester discs relative to their steel drive spindle during temperature variations, in one form of the invention a plastic washer is...
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4671995 |
Magnetic recording medium comprising an undercoating made of a mixture of thermosetting polyurethane and polyester resins
A magnetic recording medium which comprises a non-magnetic support, and a magnetic layer formed on the support through an undercoat layer is described. The undercoat layer is made of a cured...
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4667257 |
Disk drive and centering mechanism for microfloppy disk drive
An improved disk drive and centering mechanism for attachment to the spindle of a microfloppy drive, including a first circular segmented plate attached to a second circular segmented plate by four...
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4660119 |
Flexible magnetic disk sheet
A flexible magnetic disk sheet having a central circular hole is described, through which an apparatus for reading and writing is engaged, and enclosed in an jacket having a larger central circular...
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4659633 |
Magnetic recording medium
A magnetic recording medium having good durability comprising a substrate and one or two magnetic layers at least a surface of which contains at least one compound selected from the group...
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4659627 |
Magnetic recording medium with lubricant
Magnetic recording media having a coating containing harsh pigment like CrO 2 particles and adapted for frequent contact with a head, with good durability, abrasivity, etc., accommodated by using...
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4654276 |
Magnetic recording medium with an underlayer and a cobalt-based magnetic layer
An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coercivity substantially greater than prior CoPt thin film metal alloy media. A tungsten...
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4652499 |
Magnetic recording medium with a chromium alloy underlayer and a cobalt-based magnetic layer
An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a squareness greater than prior CoPt thin film metal alloy media. An underlayer of a...
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4652496 |
Magnetic recording medium
Disclosed is a magnetic recording medium which comprises a support, a magnetic recording layer and optionally a back-coating layer, at least of said magnetic recording layer and said back-coating...
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4650708 |
Magnetic recording material and a method for producing the same
In production of a magnetic recording material which accumulates information in magnetic substance packed in micro pores extending in the thickness direction of an anodic oxide surface layer formed...
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4647507 |
Magnetic recording material
A magnetic recording medium wherein a thin layer comprising an organic compound having at least one carboxyl or mercapto group, at least one fluoroalkyl group having 3 or more carbon atoms and at...
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4647506 |
Flexible, self-cross-linking binders
Flexible, self-cross-linking binders, useful for, e.g., paints and magnetic media composites, are prepared from hydroxyl-containing thermoplastic polymers reacted with condensates of diisocyanates...
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4647473 |
Method for forming protective layer on a flexible magnetic disc sheet
A method for forming protective layer on a surface portion surrounding the edge of a central aperture of a flexible magnetic disc sheet is described, comprising providing a radiation polymerizable...
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4646179 |
Flexible magnetic disc, positioning apparatus and method permitting improved head contact
A flexible magnetic disc for use in combination with a magnetic head assembly which includes a regulator plate and performs magnetic recording or playback by protruding a magnetic head beyond a...
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4645722 |
Photo-thermo-magnetic recording medium and method of preparing same
A recording medium suitable for use in a photo-thermo-magnetic memory of high density recording, including a substrate; a first magnetic layer, such as an amorphous TbFe film, which has a large...
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4643949 |
Magnetic recording tape
Magnetic recording tape comprising a flexible substrate with magnetic particles secured to the substrate by means of a binder comprising a reaction product of a diisocyanate with a blend of a chain...
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4643947 |
Magnetic recording material
A magnetic recording material which comprises a non-magnetic substrate, and a magnetic layer formed on at least one surface of the substrate. The magnetic layer is made of a uniform dispersion of a...
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4643934 |
Magnetic recording medium
In a magnetic recording medium having a magnetic recording coat formed on one side of a base and a back coat on the other side, the back coat consists of a dispersion in a binder of an inorgainc...
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4642709 |
Twin track vertical magnetic recording servo control method
The invention discloses a twin track servoing method and apparatus useful for vertical magnetic media recordings. Vertical magnetic media are those in which the magnetic vector in the medium is...
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4640863 |
Magnetic recording media
A magnetic recording medium comprising a flexible support and a magnetic layer formed on the flexible support. The flexible support is made of a resin composition which comprises thermoplastic...
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4639815 |
Magnetic recording medium with chromiumiron protective layer
A magnetic recording medium comprising a non-magnetic support, a thin magnetic metal film on the support, and a protective layer on the thin magnetic film, the protective layer containing chromium...
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