Matches 501 - 550 out of 1104 < 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >
Match Document Document Title
5135819 Photomagnetic memory medium having a non-columnar structure  
A photomagnetic memory medium of an amorphous thin film of a rare-earth transition metal alloy of non-columnar structure deposited on a substrate. In order to achieve the non-columnar structure,...
5134038 Thin film magnetic recording medium with controlled grain morphology and topology  
A magnetic storage medium is composed of a non-wettable substrate upon which a transient liquid metal layer is deposited and maintained as a distribution of discontinuous liquid features. A...
5124424 Polyurethane resin binder for magnetic recording mediums comprising a polycarbonate polyol  
A binder for a magnetic recording medium comprising a hydroxy-group-terminated polyurethane resin prepared by reaction of a polycarbonate-polyol, a chain-extender, and an organic diisocyanate; (A)...
5121280 Zone servo sector format alignment scheme for servo and spindle motor control  
A zone servo sector format alignment scheme 41 for a disc 22 of a disc drive 20 includes the disc 22 having an outer zone 42, a middle zone 44 and an inner zone 46, each zone having a plurality of...
5119259 Magnetic disk  
A magnetic disk of the stretched surface type, in which a substrate is formed at least two bases having opposing warp characteristics so as to avoid adverse deformation effects. Non-metallic...
5119258 Magnetic disc with low-friction glass substrate  
A thin-film medium formed on a low-friction glass substrate. The substrate is micro-roughened by plasma etching, under conditions which produce a desired surface density of zero crossings and depth...
5113302 Magnetic recording medium having a coupling agent disposed between a protective layer and a lubricating layer  
A magnetic recording medium having a durability improving, carbon protective film formed on a surface of a magnetic recording layer, which is in turn disposed on a substrate, and a lubricant coated...
5106704 Over write capable magnetooptical recording medium  
An over write capable magnetooptical recording medium comprises a substrate and magnetic layers including first and second layers each having a perpendicular magnetic anisotropy. In the medium, a...
5103362 Method of electrostatically sensing track position information for magnetic recording medium  
Storage capacity of a magnetic recording medium is increased by providing a nonconductive layer over a magnetic layer on which magnetic data is writable in a series of recording tracks, and...
5094897 Magnetic recording medium comprising a glass substrate and a gamma Fe.sub.2 .sub.3 magnetic thin film with specified X-ray diffraction and surface roughness  
A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties when the magnetic layer...
5094896 Magnetic recording medium comprising a glass substrate having a magnetic thin film of γ Fe.sub.2 O.sub.3 which layer has a resistivity of from 0.03 to 3 Ω-cm  
A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties and frequency response when the...
5093173 Magnetic disc comprising a substrate of an amorphous glass continuous phase dispersed with crystal particles which produce a structurally defined surface on the substrate  
A substrate for a magnetic disc, which comprises a crystallized glass consisting essentially of an amorphous glass continuous phase and crystal particles dispersed in the continuous phase, the...
5085911 Flexible magnetic disc with a two layer protective coating which top layer is a ultra violet radiation cured compound with specified elasticity modulus  
A novel flexible magnetic disc is provided comprising a protective layer on the periphery of a central hole, wherein the protective layer comprises of two layers, the lower one of the two layers...
5080948 Magnetic recording/reproducing system comprising a glass substrate thin film magnetic disk and a flying magnetic head with defined spacing and surface roughness  
A magnetic recording medium comprising a glass substrate and a magnetic thin film thereon is provided for use in a magnetic recording/reproducing system having a flying magnetic head. Floating...
5080945 Large-capacity-memory disk  
In a large capacity memory disk of the type in which data are read out by an optical system, the invention provides a large capacity memory disk characterized in that a methyl methacrylate...
5073834 Disk file or tape drive with high servo sample rate embedding additional servo sectors within individual data sectors  
A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal...
5072320 Magnetic recording and reproducing apparatus having improved durability  
In a magnetic recording and reproducing apparatus of a type wherein a magnetic disk having a magnetic recording layer formed on a rigid substrate is rotated at a high speed and magnetic recording...
5070425 Surface structure of a magnetic disk  
A magnetic disk, which has a surface with two groups of streaks, the streaks in one group crossing with those in the other group, thus reducing the dynamic friction between a magnetic head and the...
5067039 High track density magnetic media with pitted optical servo tracks and method for stamping the tracks on the media  
A flexible magnetic medium having a plurality of optical servo tracks indelibly marked on the medium and a method for stamping the tracks on the medium. The optical servo tracks comprise a...
5062021 Selectively textured magnetic recording media  
Magnetic recording media are controllably textured, particularly over areas designated for contact with data transducing heads. In connection with rigid media, the process includes polishing an...
5061537 Magnetic disk comprising a flexible substrate and a plastic film each having a specified Young's modulus and which meet specified thickness relationships  
A magnetic disk comprising an annular flexible substrate and a magnetic layer on at least one substrate major surface is provided with a plastic film ring or a pair of plastic film rings along the...
5051858 Recording disk having improved centering hub and magnetic yoke arrangement  
Recording disk, such as a data recording disk, having: 1. annular main body having datum surface intended to rest on disk drive turntable; 2. hub having a center hole; 3. magnetic yoke,...
5047274 Annodized aluminum substrate for a magnetic recording disk in which pores are filled with a non magnetic material and the surface polished and etched  
A substrate for a magnetic recording disk, made of anodized aluminum having its pores packed with a non magnetic material and having been subjected to polishing followed by an etching treatment to...
5043837 Alignment disk for magnetic head azimuth correction  
An azimuth adjustment disk having first and second areas alternately recorded in a circumfrential direction. Each of the first areas has two azimuth burst signal. The two azimuth burst signals have...
5014152 Flexible magnetic disc with a spring plate in the hub  
In a flexible magnetic disc comprised of a circular flexible magnetic sheet, an elongated metal spring plate having a main portion and support portions at respective ends of the main portion, and a...
5012380 Article surveillance protection of flexible magnetic computer data storage disks  
A flexible magnetic data storage disk with a ferromagnetic surveillance ring-shaped marker integrally bonded to the disk substrate around the central aperture. A series of slits are formed in the...
5002622 Glass based optical disc manufacturing process  
A process for manufacture of a second surface optically recordable disc having ultraviolet (UV) inhibiting characteristics is disclosed. A reflective lamina of aluminum, superimposed on a glass...
4996622 Magnetic disk with textured area on part of disk  
A magnetic disk in which a texture is formed in a first region spaced apart from an opening formed in a glass substrate by a predetermined distance, and a lubricant is coated on only the texture....
4992893 Alignment disk for magnetic disk driving apparatus and method and apparatus for verifying tracking error of the magnetic disk driving apparatus  
An alignment disk having an adjust signal recorded thereon to maintain data interchangeability of a magnetic disk drive apparatus and loadable and unloadable to and from the magnetic disk drive...
4986648 Lens and optical disc base plate obtained from copolymer of norbornyl (meth)acrylate  
An optical resin material comprising a polymer containing as an essential component at least one norbornyl acrylate or methacrylate or a derivative thereof is excellent in properties, particularly...
4985306 Base plate for recording disc and a method for its manufacture  
Herein disclosed is a method for manufacturing a base plate for a recording disc, which comprises steps of: subjecting a base plate containing therein SiO 2 -Li 2 O-Al 2 O 3 series crystallized...
4984901 Magnetic recording disc having sector reference zone, device for reading same, and magnetooptical memory optoelectronic employing said device  
A mode of writing on a magnetic recording carrier (DISC) where the information is distributed over a plurality N of tracks, each track being associated with at least one reference zone (ZRP ij )...
4983025 Magneto-optical thin film  
A magneto-optical thin film comprising a substrate having thereon at least two ferromagnetic thin layers alternating with at least two dielectric thin layers to form a laminate the ferromagnetic...
4982295 Method for centering a read/write head of a magnetic data storage apparatus on a track of a magnetic disk  
A method of centering a read/write head of a magnetic data storage apparatus on a desired track comprises steps of defining an inside reference track and an outside reference track on the magnetic...
4981538 Process for producing information recording medium  
Disclosed is a process for producing an information recording medium of air-sandwich type for optically recording or reproducing information which comprises an information recording disc and hubs...
4980782 Software protection and identification system  
A method of protecting machine readable signals recorded on magnetic recording media from unauthorized duplication and use. The signals to be protected are recorded on an authorized magnetic...
4977472 Servo address system  
A dedicated servo disk is encoded with a plurality of bit frames. Each bit frame is positioned between synchronizing bits. Each bit frame contains a first and second portion in timed succession and...
4967184 Computer disk with security protection  
A computer disk of the type having a central drive hub comprised at least in part of ferromagnetic metal to clamp the disk to a magnet spindle drive is provided with a ring-shaped amorphous...
4964009 Magnetic disk having an index area and a limited number of radially extending servo sections  
A magnetic disk, which is used for recording and reproducing data with a read/write head. The magnetic disk has an index area with an index signal recorded therein and a plurality of servo sectors...
4963209 Method for making stretched surface recording disk  
Stretched surface recording disk (SSR) 10 comprising an annular support 12 having raised annular ridges 28 and 42 at its inside and outside diameters 22 and 30 with a base portion 24 in between the...
4961123 Magnetic information media storage with optical servo tracks  
A magnetic information storage medium, such as a floppy or rigid magnetic disk having a plurality of indelible grooves inscribed on a surface of the medium to function as optical servo tracks. The...
4956243 Optical memory element  
An optical memory element contains first and second reflector films, wherein the first reflector film is made of a material of a sufficiently large light reflectance in a relative sense as compared...
4943957 High-density information recording carrier  
A high-density information recording carrier such as an optical disk which is used for recording and/or playing back information carried on a plastic substrate by means of laser beams has an...
4941066 Injection molded center core for a recording disc and related method of manufacture  
A molded center core for a flexible recording disc and a related method of manufacture are provided. The disc includes a recording media sandwiched between an injection molded center core having a...
4939614 Magnetic disk medium with circumferentially textured surfaces and varied surface roughness and method of producing the same  
A magnetic disk medium in which texture working is performed on surfaces of a substrate or on surfaces of subbing films provided on the substrate to attain circumferential worked-traces so that the...
4935835 Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature  
A magnetic medium including a physical reference feature for conveying positional information to a magnetic read/write head. The reference feature is made by indelibly marking a pattern on a...
4931338 Test disk having fluorocarbon resin asperities for magnetic disk drive component testing  
A disk for testing the sliders and their supports used in rigid magnetic disk drives has at least one asperity formed of a fluorocarbon resin. Such a test disk when mounted on a spindle and rotated...
4923574 Method for making a record member with a 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...
RE33187 Stable stretched surface recording medium  
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...
4912585 Discrete track thin film magnetic recording disk with embedded servo information  
A discrete track thin film metal alloy or metal oxide magnetic recording disk has a plurality of angularly spaced sectors, each sector being formed of a plurality of discrete blocks of magnetic...
Matches 501 - 550 out of 1104 < 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >