Abstract: A core block almost square in cross section has two winding grooves cut in its two polished sides forming one of its four corners. The grooved sides of the core block are vapor-deposited with a gap spacer to form magnetic gaps. Two side blocks, which have their one side cut with inclined track grooves, are bonded to the two sides of the core block, with the track groove sides in contact with the core block. At this time, the side blocks are adjusted to align the corresponding slant track grooves in the two side blocks. This ensures that the gap heights are equal in a single head chip, which in turn eliminates a time-consuming pairing process required with conventional manufacturing method. The assembled block is cut at their corners and then sliced along the slant track grooves to form a number of head chips.

Abstract: A multi-track magnetic head having at least three conversion elements deposited on a common substrate includes a medium sliding face which is formed in a curved shape. The positions of at least two of the three conversion elements are shifted from each other perpendicularly to the alignment direction of the conversion elements in conformity to the curvature of the medium sliding face.

Abstract: A composite magnetic head core with a writing/reading track and two erasing tracks, including a first ferrite block, and a second and a third ferrite block bonded to opposite surfaces of the first block interposed therebetween. The opposite abutting surfaces of the first block have respective first and second recessed portions, and a first rectangular protrusion and two second rectangular protrusions which protrude from the first and second recessed portions, respectively. The first protrusion is positioned between the two second protrusions in a direction of width of the writing/reading and erasing tracks. The first protrusion cooperates with the second block, to define a writing/reading magnetic gap of the writing/reading track, while the second protrusions cooperate with the third block, to define two erasing magnetic gaps of the erasing tracks. The first protrusion has a width defining the width of the writing/reading track, and a longitudinal end defining a depth of the writing/reading magnetic gap.

Abstract: A track means defined by magnetic recording media on a substrate, the media along the track means having two levels, one for recording of data, and the other for recording of servo information, wherein recorded magnetic transitions at the second level define the servo information, the transitions arrayed along the track means as groups of converging lines which extend in crosswise or spanwise relation to multiple tracks. The data is recorded without any wasted magnetic space between tracks (zero guardband) using alternating angles (azimuthal) of magnetic orientation so that they do not interfere with each other when read. The read head cores or gaps may be "oriented" to read recorded data transitions extending at different angles relative to track length direction.

Abstract: A device with magnetic heads for the recording of items of information on a magnetic medium, such as a tape, is disclosed. The magnetic heads are arranged in the form of a matrix network, which is preferably plane. For the excitation of each head, there is provision for a network of conducting wires associated with the matrix network. The excitation conducting wires are, for example, not coiled.

Abstract: A magnetic head and a method for producing the magnetic head comprising the steps of:producing a groove in a first face of a substrate;depositing a material having good magnetic characteristics on the walls of the groove;depositing a non-magnetic material in the groove over the material having good magnetic characteristics;machining a second face of the substrate until the non-magnetic material is reached, so as to create a magnetic gap; andbonding a part carrying a magnetic layer onto the first face of the substrate so as to form a magnetic circuit.

Abstract: An electromagnetic head array is provided for storage and retrieval of magnetic images on magnetic media moving adjacent to the head array. The head array is formed within a unitary amorphous metallic substrate approximately 1.5-mils thick. The illustrative head array includes seven separate heads formed within an area not exceeding 1/4-inch square. Two head groupings are described, the first being compatible with existing flexible disc recording formats and the second for use with a substantially higher density format. A schematic head array mounting and interconnection system is also disclosed.

Abstract: The head includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing devices such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution, high write field gradients, and the capability for write wide-read narrow. The read pole and write poles are laminated structures.

Abstract: A magnetic head comprises a pair of magnetic core halves (1a, 1b), which are abutted with each other through a nonmagnetic material to define a magnetic gap (2), and ferromagnetic thin films (3a, 3b). The magnetic core halves (1a, 1b), which are formed of ferromagnetic oxide, have gap forming surfaces to be abutted with each other. The ferromagnetic metal thin films (3a, 3b) are selectively formed on the gap forming surfaces of the pair of magnetic core halves (1a, 1b). A ferromagnetic thin film (3b) is so formed that portion (12b, 12c, 12d) to be provided with a track width regulating groove (13b), a coil groove (13c) or a joining member receiving groove (13d) is exposed within a gap forming surface of one magnetic core half member (7b).

Abstract: A thin-film magnetic head comprises a magnetic yoke having first and second flux conductors (3, 4) and a magneto-resistance element (7), located remotely from a head face (1). An edge portion (7a) of the magneto-resistance element (7) is located closer to the head face (1) than a second edge portion (7b). The first flux conductor (3) extends from the head face (1) to close to the first edge portion (7a) and the second flux conductor (4) extends from the head face at least to the second edge portion (7b). The magnetic head furthermore comprises a third flux conductor (5) which extends from the head face (1) to close to an end portion (16) of the first flux conductor (3) located near the first edge portion (7b). A transducing gap (17) and an inductive element (9) are located between the first and the third flux conductors (3, 5).

Abstract: A method of flux conduction comprising providing a structure with anisotropy not purely in the transverse in-plane direction such that flux spreading into the transverse in-plane direction can occur by rotation.This method of flux conduction is used in magnetic devices having coupled magnetic layers or coupled magnetic domains. Devices disclosed which utilize this method can function as a magnetic recording head, bubble memory, magnetic field structure, magnetic field sensor, transformer, laminated magnetic memory element or magnetic shield.

Abstract: The disclosed static reading head includes a dense network of micro-heads. Each of these micro-heads has a magnetic circuit body made of ferrite, closed by the tape to be read through narrow Permalloy pieces. The micro-heads are associated with lines of excitation wires supplied with DC current with a high-frequency component, and columns of reading wires connected to detection circuits.

Abstract: The magnetic head has poles at each intersection of the matrix of wires. These poles connect the pads of the same column of pads, a gap being defined between the pads of the same intersection of wires and being parallel to the data wire.

Abstract: A core block almost square in cross section has two winding grooves cut in its two polished sides forming one of its four corners. The grooved sides of the core block are vapor-deposited with a gap spacer to form magnetic gaps. Two side blocks, which have their one side cut with inclined track grooves, are bonded to the two sides of the core block, with the track groove sides in contact with the core block. At this time, the side blocks are adjusted to align the corresponding slant track grooves in the two side blocks. This ensures that the gap heights are equal in a single head chip, which in turn eliminates a time-consuming pairing process required with conventional manufacturing method. The assembled block is cut at their corners and then sliced along the slant track grooves to form a number of head chips.

Abstract: A double-head magnetic transducer assembly for use in a helical scan type tape recorder which comprises first and second magnetic heads secured to a head base so as to be successively arranged in spaced relationship to each other in the direction of transport of a magnetic tape. Each of the first and second magnetic heads has I-shaped and L-shaped core halves which are coupled to each other to form a magnetic gap and the length of the I-shaped core half in the direction of rotation of the transducer assembly is arranged to be above 0.175 millimeters.

Abstract: A method of simultaneous manufacture of a plurality of planar magnetic heads on a wafer or a slab made of non-magnetic material designed to be cut out to separate each head. The method can be applied to magnetic heads of the type including a micro-gap formed between two magnetic poles, facing a gap defined between two wire-wound ferrite cores. The method consists in depositing said thin layer magnetic poles on a first face of a wafer made of non-magnetic material and in hollowing out, in the face opposite to said wafer, at least one cavity for housing said wire-wound cores so as to obtain a calibrated spacing or a junction between the upper part of each of said wire-wound cores and said thin layer magnetic poles.

Abstract: A thin film magnetic head includes first and second head chips, each of the head chips having a substrate, a reproducing head portion and a recording head portion provided in a side edge portion on the substrate, and a protecting plate covering the reproducing head portion and the recording head portion. The reproducing head portion and the recording head portion are formed of a lower magnetic layer, an electroconductive coil layer, an upper magnetic layer and insulation layers interposed therebetween, deposited in stacked relation on the substrate one after another.

Abstract: A rotary magnetic head device utilizes a thin film magnetic head or heads having small mutual influence to external magnetic field in combination with a bulk magnetic head or heads to reduce crosstalk between recording head and reproducing head to thereby improve S/N ratio.

Abstract: The multi-track head includes more than one head chip attached onto one head base. The head chips are respectively attached onto the divided front end parts of the head base, and the relative positions of the front end parts of the head base are adjusted so that the positions of the gap ends in the head chips are set precisely to a predetermined value, before the head chips are fixed. For these reasons, it is not necessary to adjust the position of each head chip after the head chips are arranged in a rotary cylinder. It is therefore possible to obtain a head having a size which can be accurately adjusted, regardless of the size of the head chip, even when the head chip is extremely small. A bonding material is provided between the divided front end parts to secure the front end parts and the chips mounted thereon in place after they have been displaced to align them with recording medium track locations.

Abstract: The magnetic head assembly can read from and write to a plurality of tracks on a magnetic medium. The medium and assembly are relatively movable in a longitudinal direction. The assembly includes a plurality of pairs of reading poles. The assembly also includes a plurality of pairs of read loops, each adjacent and magnetically coupled to an associated pair of said reading poles. Also provided is a plurality of writing poles. Each pair of said writing poles is aligned with a different corresponding one of said writing poles. The assembly also includes a plurality of pairs of write loops, each pair of write loops being adjacent and magnetically coupled to an affiliated one of said writing poles. Each pair of write loops is selectively driveable with a pair of currents in either the same or opposite sense.

Abstract: This invention relates to a wide-write/narrow-read head having a pair of C-shaped cores one of which is used as a read core and the other of which is used as a write core, and a closure core which is provided between the two cores to shut off side magnetic circuits at the time of data reading, and provides a magnetic head which further includes an element to either offset magnetic flux of said side magnetic circuits or shorten the magnetic path length thereof or to increase magnetic resistances from said closure core to said read core in order to prevent the magnetic flux extending between said write core and said closure core from leaking into said read core from said closure core. This invention also provides a data recording/reproducing method which can offset magnetic flux of the side magnetic circuits at the time of data reading by forming a magnetic flux in said closure core in the opposite direction, and which can suspend such offsetting operation at the time of data writing by a simple ON/OFF switch.

Abstract: A magnetic sensor comprising a rotatable magnetic disc provided on its circular surface with a circular magnet belt having N and S magnetic poles alternately at a constant pitch; and a sensor means comprising a support and at least one sensor element having a plurality of magnetoresistive portions fixed to one or both surfaces of the support, the magnetoresistive portions being connected to each other in series and arranged radially at a constant interval in a point-symmetric manner on the support. This magnetic sensor is assembled in a card reader in which the magnetic disc serves as a roller rotatable with a card.

Abstract: A composite magnetic head having a recording/playback head and an erasing head combined in one unit through a nonmagnetic material is constructed such that at least one of two core halves constituting the erasing head adjacent to the recording and reproducing head is made of single crystal ferrite, a plane (100) of the single crystal ferrite is substantially parallel to a principal magnetic path-forming plane, and an angle .theta. between an orientation <100> existing in the plane (100) and an operating gap (magnetic gap)-forming plane is in the range of 10.degree.-40.degree. or 80.degree.-120.degree.. The composite magnetic head thus constructed can be made to have a reduced distance between magnetic gaps of both heads so as to be suited for being attached to the compact high-density recording and reproducing apparatus while eliminating crosstalk.

Abstract: A low magnetic isolation closure glass for use in multitrack magnetic tape heads has been prepared by combining a specific lead borosilicate glass with a specific borosilicate glass in a 60/40 weight percent ratio. The glass formed from the combination exhibits compatibility with ferrite and has reduced wear. Controlling the anneal temperature regulates the residual stress of the closure glass produced, and thus, provides some control over the wear characteristics of the glass.

Abstract: A double base type double azimuth magnetic head including two head bases and a pair of head chips bonded and anchored thereto respectively. The two head bases integrally have anchor lugs with flat reverse surfaces for anchoring the head chips thereto. The head bases further have joint regions partially and are joined to each other at the surfaces of the joint regions in such a manner that the anchor lugs are placed mutually adjacent in the same direction and the reverse surfaces of the anchor lugs become flush with each other. The pair of anchored head chips are so disposed as to constitute a double azimuth head while being positioned mutually adjacent on one line with a predetermined gap left therebetween, and screw-setting circular apertures are formed in the joined head bases for attachment to a rotary drum. Due to such a structure, the operation of winding coils around the head chips can be automated, and the dimensional precision is enhanced.

Abstract: A magnetic transducer assembly for cooperating with a relatively moving magnetic recording medium to magnetically record and reproduce information on and from the magnetic recording medium. The transducer assembly comprises first and second magnetic transducers incorporated into one rail of a double-rail type slider with they are adjacent to each other. The rail has a contacting surface with a recording surface of the recording medium in recording and reproducing. The first magnetic transducer includes a first read/write core assembly having a first magnetic gap extending in directions normal to the moving direction of the recording medium and placed in a plane including the contacting surface of the rail. The second magnetic transducer includes a second read/write core assembly having a second magnetic gap which is different in length from the first magnetic gap and extends in directions normal to the moving direction thereof.

Abstract: The magnetic head of the present invention comprises a recording head section having a first gap of a given width and a reading/erasing head section having a second gap. The middle portion of the second gap is straight by the given width, and parallel with the gap of the recording head section. Both side portions of the second gap are symmetrically bent at an angle towards the recording head section so that the magnetic head can prevent the data error while reading information from a diskette.

Abstract: A bi-directional magnetic head assembly comprises a first write head adjacent to a read head, adjacent to a second write head. The three heads are in-line, so that the tape engages one or the other write head followed by the read head for either direction of tape motion. The central read head has slots on either side of its transducing region for skiving of entrained air and debris from the tape before the tape engages the transducing element of the read head for either direction of tape travel. On the other hand, each write head has only a single slot for skiving entrained air and debris; a slot being located in each write head structure outboard from the write transducing gap. In reading while writing during bi-directional operation, the write head first approached by the tape for a given direction of motion is the active, writing head. Because the slot is on the outboard side of each write head structure, skiving action occurs prior to the tape reaching the active write transducing gap.

Abstract: A magnetic head for a video tape recorder including a mounting base and two transducer elements comprised of a pair of core tips mounted to one end of the mounting base with a small non-transducing gap defined between the core tips. Each of the core tips has a tape sliding surface on which a magnetic tape is slidingly traveled. A radius of curvature R (mm) of the tape sliding surface and a distance W (mm) between the tape sliding surfaces are so set as to satisfy the conditions of 19.5-20W .ltoreq.R.ltoreq.21.5-20W and 0.15.ltoreq.W.ltoreq.0.45. Accordingly, a quantity of sinking of the magnetic tape at the gap between both the core tips is limited to thereby reduce a noise in a special reproducing operation such as a reverse video search operation.

Abstract: A composite type magnetic head assembly for recording and/or reproducing an information signal on and from a magnetic tape transported in a predetermined direction comprises a plurality of magnetic heads aligned in the predetermined direction with a predetermined separation, each of the magnetic heads carrying a plurality of magnetic cores aligned generally perpendicularly to the predetermined direction, deformable connection member provided substantially in coincidence with a center line passing in the predetermined direction through a central part of the plurality of magnetic cores on each of the plurality of magnetic heads for providing a fulcrum deformably connecting the plurality of magnetic heads each other, and adjusting member provided so as to engage with a pair of neighboring magnetic heads for modifying the predetermined separation.

Abstract: A magnetic head for multi-track data recording on magnetic tape is formed of a combination of two head modules, each having a linear array of thin-film transducer elements formed on a substrate, each of these arrays consisting of a mixture of write elements and read elements. These are positioned on the respective head modules such that when the head modules are combined with the substrates mutually opposing, pairs of transducer elements are formed for respective tape tracks, each pair consisting of a read and a write element. "Read-after-write" recording confirmation can thereby be implemented together with bidirectional recording operation, by using only a combination of two head modules.

Abstract: A magnetic transducer head assembly comprises a pair of magnetic core halves of generally C-shaped configuration and a coil wound on one of the core halves. The limbs of the C of each core half is in abutment relationship with those of the other core half to define a medium-contacting face and a magnetic gap on the medium-contacting face. The magnetic gap includes an inner gap section and outer gap sections respectively disposed on opposite ends of the inner gap section. Each of the outer gap sections has a gap length much greater than the gap length of the inner gap section and is in the shape of a meandering configuration which is formed by a series of crests on one of the core halves and a series of troughs on the other core half. The tips of the crests of each core half lie on an imaginary plane which is aligned or retracted from a plane defined by the inner gap section.

Abstract: In a magnetic head a metal magnetic layer and a non-magnetic layer are sequentially formed on a pair of magnetic cores in which track widths are formed by a predetermined pitch. The metal magnetic layer and the non-magnetic layer formed outside the track widths are removed while leaving the track widths formed in said magnetic cores, thereby forming a regulation groove. The track widths of one magnetic core from which the metal magnetic layer and the non-magnetic layer are removed are caused to oppose those of the other magnetic core. Glass as an adhesive is filled in the regulation groove and melted to bond the magnetic cores so that a gap having the metal magnetic layer is formed. The pair of magnetic cores bonded to form the gap therebetween are cut by a predetermined pitch to form a magnetic head.

Abstract: A method of manufacturing a magnetic head includes a first step of forming rectilinear V grooves on the top surface of a substrate, a second step of forming magnetic films on slant faces of the V grooves, a third step of leveling the top surface of the substrate after filing the V grooves with glass, a forth step of dividing the substrate into first and second substrates, a fifth step of forming grooves for coil winding on the top and bottom surfaces of each substrate, a sixth step of melting the glass of each V groove and bonding the first and second substrates, and a seventh step of slicing the bonded body, the first step including a step of forming the V grooves by means of a first grinding wheel and a step of finishing one of slant faces of the V grooves by means of a second grinding wheel, of which end is V-shaped, so that the slant has smaller surface roughness, the second grinding wheel being shaped such that one of the grinding wheel surfaces comes into contact with one of the slant faces of the V gro

Abstract: A method of recording signals on a magnetic medium, in which a first magnetic head (1) blanks a wide track by recording signals at a first azimuth angle and a second magnetic head (2) records a narrower signal track (15) by recording signals at a second, differing azimuth angle. This permits feeding the same current or signal through the head windings (8,9) of both heads, thereby economizing on driving circuitry (10). Due to the differing azimuth angles, the reading head does not pick up any significant amount of noise from the border regions defined between the edges of the signal track and the wider blanking track. The width of the signal track and the widths of the border regions sum to equal the width of the blanking track.

Abstract: An ultra small track width magnetic transducer and manufacturing method. The transducer has two coplanar confronting magnetic poles provided by a thin film layer of magnetic material. The thickness of the layer defines a track width. A transducing gap is etched in the magnetic layer by utilizing focused ion beam milling technology. The thusly obtained gap has a predetermined length and depth and it separates the magnetic layer into two confronting coplaner magnetic poles. A layer of non-magnetic material is deposited over the magnetic layer to fill the transducing gap. The transducing gap may be etched in a plane extending orthogonally to the plane of the magnetic core layer. Alternatively, the transducing gap plane may extend at an oblique angle to the magnetic core layer to obtain a transducing gap useful in aszimuth recording/playback.

Abstract: A floating-type magnetic head comprising a slider and a core chip secured thereto. The core chip comprises a pair of core segments joined together with a gap spacer and a thin ferromagnetic metal film which are formed at the joint only over a portion of the entire area of the joint which portion terminates at the face of the core chip to be opposed to magnetic recording media. The two core segments area bonded to each other with glass present over the remaining portion of the joint area. In producing the magnetic head, the core chip is prepared by fabricating a core block comprising a pair of base plates joined together and strips of thin ferromagnetic metal film and gap spacer provided at the joint, and machining the core block.

Abstract: A composite magnetic head core with a writing/reading track and two erasing tracks, including a first ferrite block, and a second and a third ferrite block bonded to opposite surfaces of the first block interposed therebetween. The opposite abutting surfaces of the first block have respective first and second recessed portions, and a first rectangular protrusion and two second rectangular protrusions which protrude from the first and second recessed portions, respectively. The first protrusion is positioned between the two second protrusions in a direction of width of the writing/reading and erasing tracks. The first protrusion cooperates with the second block, to define a writing/reading magnetic gap of the writing/reading track, while the second protrusions cooperate with the third block, to define two erasing magnetic gaps of the erasing tracks. The first protrusion has a width defining the width of the writing/reading track, and a longitudinal end defining a depth of the writing/reading magnetic gap.

Abstract: A magnetic head comprises a pair of magnetic core halves (1a, 1b), which are abutted with each other through a nonmagnetic material to define a magnetic gap (2), and ferromagnetic thin films (3a, 3b). The magnetic core halves (1a, 1b), which are formed of ferromagnetic oxide, have gap forming surfaces to be abutted with each other. The ferromagnetic metal thin films (3a, 3b) are selectively formed on the gap forming surfaces of the pair of magnetic core halves (1a, 1b). A ferromagnetic thin film (3b) is so formed that portion (12b, 12c, 12d) to be provided with a track width regulating groove (13b), a coil groove (13c) or a joining member receiving groove (13d) is exposed within a gap forming surface of one magnetic core half member (7b).

Abstract: Disclosed is a method for reading or writing data on a tape which has a plurality of data tracks and at least a first dedicated servo track. A multiple channel head with at least three channels, each having at least one element for reading or writing, is used to access the tracks on the tape. The head is moved proximate one of a plurality of predetermined positions. The channels are located so that, in any one predetermined position of the head, one channel accesses the center of a dedicated servo track on the tape and at least two other channels will access the center of distinct data tracks. Depending on the predetermined position of the head, different channels will access a dedicated servo track. The position information on a dedicated servo track is used to move the head to one of the predetermined positions once the head has been moved proximate that predetermined position.

Abstract: A magnetic head core including two ferrite blocks which are bonded together so as to form a magnetic path and which includes respective two protrusions protruding from the opposed surfaces thereof. The protrusions have opposed end faces cooperating with each other to define a magnetic gap therebetween. The opposed surfaces of the two ferrite blocks cooperate with the two protrusions, to define two cutouts formed on opposite sides of the magnetic gap, such that a spacing provided between the opposed surfaces by each cutout is larger than an amount of the magnetic gap. The cutouts define an effective width of a track of the head core in which the magnetic gap is open. Each protrusion has two side surfaces inclined at an angle of 25.degree.-75.degree. with respect to its end face.

Abstract: In a magnetic head, a bobbin is wound with coils for reading and writing and for erasing. A front core having a core for reading and writing and a core for erasing, a back core and a dummy core are supported by the bobbin by passing through respective aperture in the bobbin. The front core is connected to the back core to generate a magnetic flux with the coils.

Abstract: A method for manufacture of a bulk-type magnetic head capable of performing a frame recording operation. A pair of magnetic core blocks with magnetic gaps formed in butt surfaces thereof are slit and comb-toothed to produce a pair of head element couplers, and such element couplers are joined to each other in a state where the comb-toothed portions of one coupler are inserted into the slits in the other coupler while the respective coupling portions are butted to each other, whereby the in-line precision of the magnetic gaps can be enhanced.

Abstract: Sensor are widely used to read magnetic data and to read the magnetic and the optical patterns printed on notes and so on. A multichannel head in accordance with the present invention has plural magnetic cores arranged in a row and a cancellation core for noise removal, the head can detect magnetic characteristics as a whole in a stationary state without depending on the relative speed of the magnetic member with the head, and therefore is least affected by noise. Since one cancellation core is shared by plural magnetic cores, the structure as a whole becomes simple, and the cost of manufacture can be remarkably reduced. Since a magnetic head is combined with optical fibers in an integral structure according to this invention, it can read magnetic patterns and the optical patterns on the same location simultaneously by a parallel operation.

Abstract: A magnetic transducer of the erasing type, in which the coil is pre-wound to achieve greater manufacturing economy; and in which for the same reason, and also for electromagnetic operating efficiency, the core is laminated with each lamination being of one-piece fabrication. However, the single transducing gap in the core is too small to permit threading the coil thereon. Therefore, the core is formed of flexible material so that the gap can be enlarged to accept the coil during assembly. Alternatively, the core can be fabricated initially with an enlarged gap, and the flexible core is then bent to provide a desired gap length after the coil is assembled thereon. A variational form of the invention has two erase gaps and one record-play gap with a separate coil therefor.

Abstract: A novel apparatus and method is described for recording a pattern of track positioning servo signals at select locations of a magnetic tape for use in aligning a single track read head with each of the tracks defined by the signal pattern. The pattern is provided by recording two different signals with two write heads so that the signals are recorded as alternating strips. The differences between the two signals are then used to define the each track center.

Abstract: A method for writing and reading for a floppy disc drive using a read/write head having a high density read/write gap and a low density read/write gap and a memory buffer. The method includes reading requested data and data ahead of the requested data from the disc and then storing the read data ahead of the requested data in a look-ahead memory buffer. Data stored in the look-ahead memory buffer is then read, instead of from the disc, when the next requested data is the same as the data stored in the memory buffer. There is no movement of the disc until reading of the data stored in the memory buffer is completed or until other data is requested that is needed directly from the disc. The above method reduces power consumption and provided an improved higher rate of read/write operation for a floppy disc drive that is particularly useful in a portable computer.

Abstract: A magnetic head, and method of its construction, for placing multiple, high tolerance servo information tracks in evenly spaced configuration across the width of a magnetic medium in a single pass of the magnetic head over the medium. The head comprises a monitoring fixture which secures a full-width write transducer, in tandem with a multiple-track write transducer. Preferably, the transducers are angularly skewed with respect to the travel direction of the magnetic medium, but are substantially parallel to each other. In operation, the magnetic medium first passes adjacent the full-width write transducer which writes a servo pattern across the width of the magnetic medium at a first frequency. The magnetic medium next passes adjacent the multiple-track write transducer which writes servo information onto multiple tracks in the magnetic medium at a second frequency.

Abstract: A read-while-write magnetic head assembly adapted for use with a recording medium wherein the magnetic head assembly is formed of two transducing head sub-assemblies having a feedthrough shield interposed therebetween and wherein each transducing sub-assembly includes a transducer having a transducing element located on one side thereof and conductive leads extending from a different side thereof, a substrate formed of a material which is highly resistant to being abraded by the recording medium and wherein the substrate has a medium contacting surface and a support surface which extends substantially perpendicular therefrom and wherein the substrate has the transducer rigidly affixed to the support surface with the transducing element of the transducer positioned adjacent the substrate contacting surface, a spacer formed of a material which is highly resistant to being abraded by the recording medium and wherein the spacer has a medium contacting surface which is rigidly affixed in opposed, spaced relationsh

Abstract: A magnetic head assembly having a transverse guiding surface which is highly resistant to being abraded by a recording medium for reading and recording magnetically recorded information on the recording medium including a transducer having a transducing element on one end thereof and conductive leads extending from a different end thereof, a substrate formed of a mixture of Aluminum Oxide and Titanium Carbide ("Al.sub.2 O.sub.3 --TiC") having a medium contacting surface and a supporting surface extending substantially perpendicular therefrom wherein the substrate has the transducer rigidly affixed to the substrate supporting surface with the transducing element positioned adjacent the substrate contacting surface, a spacer formed of Al.sub.2 O.sub.