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8027116 |
Method of manufacturing a hard-disk drive using a bulk eraser
A method of manufacturing of a hard-disk drive using a bulk eraser for erasing recorded information on a magnetic-recording disk. The method includes providing a bulk eraser that produces...
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7930494 |
Storage area network (SAN) switch multi-pass erase of data on target devices
Techniques are provided for performing multi-pass erase. An erase command is received at a storage area network (SAN) switch in a storage area network. The erase command is associated with a block...
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7706102 |
Secure data storage
A hard disk drive includes a chassis which supports a “sealed” housing containing a data storage magnetic disk, and read/write heads and actuator. The housing also contains an erasure device whi...
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7707371 |
Storage area network (SAN) switch multi-pass erase of data on target devices
Techniques are provided for performing multi-pass erase. An erase command is received at a storage area network (SAN) switch in a storage area network. The erase command is associated with a block...
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7623310 |
Magnetic recording medium, servo signal write head unit, and servo writer
Disclosed is a magnetic recording medium which enables a magnetic head to be accurately positioned even if higher-density recording of magnetic recording media is reinforced. The magnetic recording...
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7576949 |
Servo track magnetic recording head for pre-erasing magnetic tape
The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to ...
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7561378 |
Data erasing device using permanent magnet
A data erasing device that erases data recorded on a magnetic disk, by a magnetic field generated in a horizontal direction by magnets, in order to prevent leakage of the data recorded on the...
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7394619 |
Disk drive write head for writing cross-track magnetizations
An inductive write head has its write poles and write gap oriented to generate magnetic fields in the cross-track direction on a magnetic recording disk in a disk drive. The disk has the...
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7256962 |
Magnetic tape drive with AC erase element upstream from plural head elements
A magnetic head including a plurality of head element units provided along a width direction with respect to a magnetic tape. Each head element unit is provided with at least one recording element...
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7190551 |
Composite magnetic head and process for producing the same
A composite magnetic head comprising a DC-erasing head, which is slidably contact with a driving magnetic tape, and which DC-erases a servo band of the magnetic tape in such a manner that the...
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7027709 |
Method for forming magnetic gap of video signal erasure head, erasure head, and video recorder having the same
The invention provides a simple method for forming a gap for an erasure head to improve the quality of this erasure head. A front core 3 constituting an erasure head H includes in configuration two...
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RE39029 |
Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads
A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each...
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6822827 |
Erasure techniques for magnetic tape media
Methods and apparatus for erasing magnetic tape are described. The tape to be erased is fed through an erasure unit that includes an array of magnetic elements. The array of magnetic elements...
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6714398 |
Bulk degausser with fixed arrays of magnetic poles configured for thick and small form factor, high coercivity media
A bulk degaussing apparatus and method for erasing magnetic media of various sizes. A media passage track is provided such that media passing therethrough is uniformly exposed to the magnetic...
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6072668 |
Full width erase head assembly for magnetic reproducer
Disclosed is a full width erase head assembly for a magnetic reproducer. According to the present invention, a horizontal flow preventing member is extended to a predetermined angle from a rear...
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6064537 |
Disk drive with fault detector for erase heads
A floppy disk drive comprises a read/write head and a pair of erase heads. The read/write head has a gap that extends across and beyond opposite edges of a track, while the gaps of the erase heads...
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6040963 |
Fringe field compensation system for multi-track servo recording head
A multi-track servo recording head assembly records a plurality of identical tracks of servo information longitudinally defined within a very high density servo section along a magnetic recording...
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5979774 |
Magnetic display erasing apparatus including a plurality of magnets
A magnetic display erasing apparatus is provided in which an ideal erasing magnetic field can be realized by using a small-sized magnet. A magnet is formed by bending a rectangular plate-like...
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5953482 |
Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads
A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each...
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5822160 |
Full erase head with guide portion being supported by the tape guide post of VCR
A full erase head assembly for erasing a signal recorded on a tape includes a full erase head, a guide post installed on a deck base for guiding the tape, a guide portion formed on a first side of...
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5771128 |
Edit recording method and apparatus using erase head control
An edit recording method and apparatus using erase head control is provided in which connection portions between programs are edited and recorded in a manner which prevents the erasure of a...
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5742460 |
Movable full erasing head
A full erasing head unit disposed on a deck chassis of a video cassette recorder includes a full erasing head, a base plate for mounting the full erasing head thereon in such a way that the full...
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5537277 |
Magnetic head for use in converting a low track density disk to a high track density disk
A magnetic head for sliding on a recording medium for executing magnetic recording or magnetic reproducing of information includes a magnetic core having a recording/reproducing magnetic gap whose...
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5428892 |
Method of manufacturing a combined tunnel erase head
In a method of manufacturing a tunnel erase type combined magnetic head core using a first core member having a predetermined pole height dimension defined by a surface on a magnetic gap formation...
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5309296 |
System for eliminating noise arising from difference in polarity of magnetization by tunnel erase heads
A magnetic disk drive is disclosed which has a tunnel erase head assembly comprising a read/write head for writing and reading data on a magnetic disk, and a pair of tunnel erase heads for trimming...
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5243483 |
Rotary drum device
This invention relates to a rotary drum device used in magnetic recording and playback apparatus such as VTRs, and particularly to the structure of a magnetic head and flying erasure head mounted...
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5229903 |
Magnetic head with inclined core
The structure of a magnetic head for use in a disk drive has an erase core and a read/write core which are inclined to a track of a floppy disk or disket. An erase gap and a read/write gap formed...
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5181150 |
Dual magnetic head for reading and writing information at high and low track density including erase gaps having an undulating shape
A dual magnetic head capable of reducing unneccessary magnetic flux developed in erase cores. The dual magnetic head includes a first read/write core (30) having a first gap width (34) and...
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5138508 |
Magnetic head core
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...
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5132860 |
Magnetic media erasure system
An erasure system for magnetic information storage media is disclosed by which magnetic media, such as computer, video and audio tapes, cassettes and discs, can be thoroughly erased. The system...
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5122916 |
Electromagnetic head having interference compensation circuitry
In a magnetic sensing head with reduced crossfeed interference circuitry, the winding of each half of a magnetic core of the head is wound in the same direction as the other about the core. Each...
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5061842 |
Erasure mechanism for card readers
A card reader having a card reading mechanism, a card perforating device and a card erasure mechanism, wherein the erasure mechanism comprises a permanent magnet movable by means of a pivoted arm...
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5041936 |
Magnetic recording transducer assembly with two gaps of different length
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...
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4996620 |
Electromagnetic transducers having E-shaped cores and shielding therebetween
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...
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4965688 |
Permanent magnet type erasing head
A permanent magnet type demagnetizing head is made by successively molding a resin-magnet which forms a body having a magnetic member forming a part of a tape contact surface and a resin which...
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4949199 |
Magnetic recording/reproduction apparatus
Disclosed is a magnetic recording/reproduction apparatus wherein a pulse corresponding to rotation of a magnetic disk is obtained by detecting a PG yoke signal as a rotational position detection...
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4897746 |
Magnetic head device
A magnetic head device for a floppy disk drive apparatus, which can read data from, and write data on, floppy disks of different recording densities is disclosed. The magnetic head device comprises...
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4893208 |
Magnetic erase head with terminator magnets on the ends
An improved form of magnetic erase head is provided which utilizes, in a magnetic erase head, leading and trailing "terminators", which suppress stray fields emanating from leading and trailing...
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4891712 |
Method of conducting marketing research by using video tape productions
A new use of manufacture is disclosed. The marketing research method includes preparing a video tape for viewing by a member of a defined research sample. The tape is placed into a cassette and...
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4870523 |
Magnetic head apparatus used for movable magnetic medium with head gap positioning
A magnetic head apparatus used for a movable magnetic medium, comprising a magnetic head core in which a recording/reproducing core and an erasing core are respectively disposed on the entrance...
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4858048 |
Complex magnetic transducer head of single magnetic pole type for perpendicular mode recording
A complex magnetic transducer head with a single magnetic pole includes a recording and reproducing main magnetic pole made of a thin film of soft magnetic material with a predetermined width and...
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4847715 |
Magnetic head having short distance between gaps for recording reproducing and erasing
A tunnel erasing-type magnetic head having a short distance between the gaps, wherein a second core half is sandwiched between the first core half and the third core half, a magnetic gap for...
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4847718 |
Cassette with erasing means
A cassette having improved erasing means is disclosed. The cassette has a top and a base which define a front wall. The front wall defines an opening through which the tape passes on its way to a...
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4831481 |
Composite magnetic head and method of manufacturing the same
A composite magnetic head is integrally formed with a recording/reproducing head section having a recording/reproducing gap and an erasing head section having two erasing gaps. The magnetic head...
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4821126 |
Magnetic recording method involving core pieces of different thickness
Based on the fact that the recording track width depends on the width of a core at the trailing side relative to the moving direction of magnetic recording medium, narrower track recording and...
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4811140 |
Magnetic data transfer apparatus having improved transducer coil arrangement
An apparatus having a pair of magnetic transducer head assemblies for data transfer with both sides of a recording medium such as a flexible magnetic disk. One of the head assemblies is mounted via...
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4799115 |
Method and apparatus for tolerating track misregistration systems in twin track vertical recording systems
Track misregistration between a read-back head and a previously recorded pair of tracks can cause erroneous data to be detected by the read head. It has been discovered that a prior erasure to...
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4787002 |
Magnetic head having a read/write coil with a d.c. current through it for cancellation of leakage magnetic flux from erase coil
A magnetic disk drive apparatus is disclosed including a read and write head having a read and write coil and an erase head having an erase coil at the opposite sides of the read and write head for...
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4774616 |
Magnetic head having an integrated recording and playback head and an erasure head
The present invention relates to a magnetic head, which can form guard bands on a magnetic recording medium and which is especially suitable for magnetic discs, and a fabrication process thereof....
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4772967 |
Magnetic recording apparatus in a helical scan system
A magnetic recording apparatus of a helical scanning system comprises a rotary cylinder (13), recording heads (A and B) and an erase head (10) attached to slightly project from a rotating surface...
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