Perpendicular Pole Head for Servo Writing Magnetic Media

The present disclosure relates to a perpendicular pole head for creating a perpendicular magnetic moment in a concentrated pattern for writing the pattern on perpendicular magnetic media, such as BaFe based media. The pole head can have flux concentrators in the shape of the written pattern, which can be repeatedly applied to a moving magnetic medium to create a timing pattern on the media, e.g., a servo timing pattern. 1. A perpendicular write head , comprising:a primary write head configured to generate a magnetic field approximately perpendicular to a surface of the head; anda concentrator on the surface configured to concentrate the magnetic field in a pattern.2. The perpendicular write head of claim 1 , where the concentrator includes at least two servo stripes disposed at an angle with respect to each other.3. The perpendicular write head of claim 1 , wherein the magnetic field is concentrated in a medium by the concentrator such that the concentrated magnetic field is >110% of a coercivity of the medium claim 1 , and wherein the magnetic field generated by the primary write head is <90% of the coercivity of the medium claim 1 , absent the concentrator.4. The perpendicular write head of claim 1 , wherein the concentrator is substantially disposed in one of a “\/” shape claim 1 , a “/\/” shape claim 1 , a “\/” shape claim 1 , or a “//\” shape.5. The perpendicular write head of claim 1 , wherein the magnetic field generated by the primary write head is claim 1 , at least near the surface claim 1 , approximately perpendicular to the surface and the primary write head does not generate a substantial magnetic field approximately parallel to the surface.6. The perpendicular write head of claim 1 , wherein the primary write head is configured to generate the magnetic field in a first direction approximately perpendicular to and away from the surface of the head.7. The perpendicular write head of claim 6 , wherein the primary write head is configured to generate the ...

METHODS AND SYSTEMS FOR MAGNETIC MEDIA SERVO WRITING

A method comprises generating first and second magnetic field components in a magnetic medium, the second magnetic field component substantially opposite the first. A pattern is written onto the magnetic medium, and a signal is generated by reading the pattern. The magnitude of the second magnetic field component is controlled based on an asymmetry of the signal. 1. A method comprising:generating a first magnetic field component in a magnetic medium;generating a second magnetic field component in the magnetic medium, substantially opposite the first magnetic field component;writing a pattern onto the magnetic medium;generating a signal by reading the pattern from the magnetic medium;determining an asymmetry in the signal; andcontrolling a magnitude of the second magnetic field component based on the asymmetry.2. The method of claim 1 , wherein determining an asymmetry in the signal comprises comparing a positive peak amplitude in a servo signal to a negative peak amplitude in the servo signal.3. The method of claim 2 , wherein controlling a magnitude of the second field component comprises controlling the magnitude to reduce the asymmetry.4. The method of claim 1 , wherein generating the first field component comprises generating a fixed field component with a fixed-field magnetic head.5. The method of claim 4 , wherein generating the second field component comprises generating a variable field component with an electromagnetic head.6. The method of claim 5 , wherein controlling a magnitude of the second field component comprises adjusting a current supply to the electromagnetic head.7. A magnetic tape formatted according to the method of .8. The magnetic tape of claim 7 , further comprising a recording layer configured for perpendicular recording.9. The magnetic tape of claim 8 , wherein the recording layer comprises barium ferrite.10. The magnetic tape of claim 8 , wherein the first and second field components are oriented substantially perpendicular to the ...

TAPERED POLE HEADS FOR MAGNETIC MEDIA

A system comprises a first tapered core configured for positioning adjacent a first surface of a magnetic medium, and a second tapered core configured for positioning adjacent a second surface of the magnetic medium, opposite the first tapered core along a travel direction of the magnetic medium. Each of the first and second tapered cores has a transverse width defined with respect to the magnetic medium, where the transverse width decreases from a first end of the tapered core to a second end of the tapered core, the second end forming a pole face adjacent the magnetic medium. 1. A system comprising:a first tapered core positioned near a first surface of a magnetic medium;a second tapered core positioned near a second surface of the magnetic medium, the second tapered core positioned opposite the first tapered core along a travel direction of the magnetic medium;wherein each of the first and second tapered cores has a transverse width defined with respect to the magnetic medium, the transverse width decreasing from a first end of the tapered core to a second end of the tapered core, the second end forming a pole face adjacent the magnetic medium.2. The system of claim 1 , wherein each of the tapered cores has a longitudinal flux density claim 1 , the longitudinal flux density increasing from the first end of the tapered core to the pole face.3. The system of claim 2 , wherein the transverse widths of the first and second tapered cores decrease along a travel direction of the magnetic medium.4. The system of claim 2 , wherein the pole faces of the first and second tapered cores extend transversely from the first and second surfaces of the magnetic medium.5. The system of claim 4 , wherein the pole faces of the first and second tapered cores are substantially aligned along the travel direction.6. The system of claim 1 , wherein the transverse width of at least one of the first and second tapered cores decreases substantially linearly along the magnetic medium.7. The ...

SERVO WRITE HEAD

An assembly comprises a plurality of laterally spaced front blocks, a magnetic post coupling each of the front blocks to a common back bar, and a common front bar magnetically coupled to the back bar. A write gap spacer is positioned between the front bar and each of the plurality of front blocks, and a write gap element comprising write gaps couples the front bar to each front block across the write gap spacer. A coil is configured to generate magnetic flux in each magnetic post, and the front blocks are configured to direct the magnetic flux across the write gaps. 1. An assembly comprising:a plurality of laterally spaced front blocks;a magnetic post coupling each of the front blocks to a back bar;a front bar magnetically coupled to the back bar;a write gap spacer positioned between the front bar and each of the plurality of front blocks;a write gap element coupling the front bar to each front block across the write gap spacer, the write gap element comprising write gaps; anda coil configured to generate magnetic flux in each magnetic post, wherein the front blocks direct the magnetic flux across the write gaps of each write gap element.2. The assembly of claim 1 , further comprising a plurality of laterally spaced intermediate blocks positioned between the laterally spaced front blocks claim 1 , wherein the intermediate blocks are magnetically coupled to the front bar and substantially decoupled from the back bar.3. The assembly of claim 2 , further comprising block spacers positioned between the plurality of laterally spaced front blocks and the plurality of laterally spaced intermediate blocks claim 2 , wherein the block spacers substantially decouple each intermediate block from each coil.4. A system comprising a magnetic medium positioned adjacent the assembly of .5. The system of claim 4 , wherein the plurality of laterally spaced front blocks define servo bands along the magnetic medium.6. A magnetic medium having at least four servo bands written by the ...

SYSTEMS AND METHODS FOR PROCESSING MAGNETIC MEDIA

A system comprises a magnetic medium with a first magnetic gap adjacent a first side and a second magnetic gap adjacent a second side, opposite the first magnetic gap. The first magnetic gap generates first longitudinal and perpendicular field components. The second magnetic gap generates second longitudinal and perpendicular field components. The first and second longitudinal field components are substantially aligned along a recording layer of the magnetic medium, and the first and second perpendicular field components are substantially opposed across the recording layer of the magnetic medium. 1. A system comprising:a magnetic medium having a recording layer;a first magnetic gap adjacent a first side of the magnetic medium, the first magnetic gap generating a first longitudinal field component and a first perpendicular field component;a second magnetic gap adjacent a second side of the magnetic medium and opposite the first magnetic gap, the second magnetic gap generating a second longitudinal field component and a second perpendicular field component;wherein the first and second longitudinal field components are substantially aligned along the recording layer; andwherein the first and second perpendicular field components are substantially opposed across the recording layer.2. The system of claim 1 , wherein the magnetic medium comprises a perpendicular recording layer.3. The system of claim 2 , wherein the perpendicular recording layer comprises barium ferrite.4. The system of claim 1 , wherein the first and second longitudinal field components provide sufficient longitudinal bias to erase data from the recording layer.5. The system of claim 4 , wherein the first and second perpendicular field components provide a net perpendicular bias in the recording layer that is less ten percent of the longitudinal bias in the recording layer.6. The system of claim 1 , wherein the first and second magnetic gaps overlap in a tracking direction along the magnetic medium.7. ...

METHODS AND SYSTEMS FOR MAGNETIC MEDIA SERVO WRITING

A method comprises generating first and second magnetic field components in a magnetic medium, the second magnetic field component substantially opposite the first. A pattern is written onto the magnetic medium, and a signal is generated by reading the pattern. The magnitude of the second magnetic field component is controlled based on an asymmetry of the signal. 1. A method comprising:generating a first magnetic field component in a magnetic medium;generating a second magnetic field component in the magnetic medium, substantially opposite the first magnetic field component;writing a pattern onto the magnetic medium;generating a signal by reading the pattern from the magnetic medium;determining an asymmetry in the signal; andcontrolling a magnitude of the second magnetic field component based on the asymmetry.2. The method of claim 1 , wherein determining an asymmetry in the signal comprises comparing a positive peak amplitude in a servo signal to a negative peak amplitude in the servo signal.3. The method of claim 2 , wherein controlling a magnitude of the second field component comprises controlling the magnitude to reduce the asymmetry.4. The method of claim 1 , wherein generating the first field component comprises generating a fixed field component with a fixed-field magnetic head.5. The method of claim 4 , wherein generating the second field component comprises generating a variable field component with an electromagnetic head.6. The method of claim 5 , wherein controlling a magnitude of the second field component comprises adjusting a current supply to the electromagnetic head.7. A magnetic tape formatted according to the method of .8. The magnetic tape of claim 7 , further comprising a recording layer configured for perpendicular recording.9. The magnetic tape of claim 8 , wherein the recording layer comprises barium ferrite.10. The magnetic tape of claim 8 , wherein the first and second field components are oriented substantially perpendicular to the ...

System and method for tracing data storage devices

An electronic data storage device tracing system includes at least one data storage device and a reader system. The data storage device includes a housing having an optical label and a device RFID tag coupled to the housing. In this regard, the optical label is printed with a VOLSER number and the device RFID tag includes a chip that electronically stores the VOLSER number. The reader system is configured to read the VOLSER number from the chip and trace the at least one data storage device entering/exiting the reader system.

Servo mark verify head

The invention presents techniques for verifying patterns, such as time-based servo marks, recorded on magnetic media. Patterns of this kind can be recorded on a magnetic medium using a recording head that includes a surface having a flux gap with a defined shape. The patterns may be verified with a verify head, having a surface with a flux gap with the defined shape or part of the defined shape. The verify head may include two or more ferromagnetic cores, with a flux gap associated with each core. Each core can independently verify part of the recorded pattern.

Recording head core yoke with full length core support

A yoke for supporting a magnetic recording core adjacent a moving recording tape is disclosed. The core has two major surfaces, two side walls, and upper and lower walls. Two wound wire coils are mounted to the core adjacent respective side walls and extend beyond the major surfaces. The yoke includes two opposed major surfaces and a front surface which defines a bearing surface for supporting the recording tape. A narrow slot is formed in the front surface to receive the core. The walls of the narrow slot stabilize the core along the length of the core adjacent the core upper wall. Relief pockets extend between the two major surfaces of the yoke and encompass at least a portion of the narrow slot. The relief pockets permit winding the coils around the core after the core is positioned in the yoke.

Label programmer, system, and method of initializing RF-enabled labels

A label programming system configured to initialize a radiofrequency (RF)-enabled label for attachment to a data storage device includes a platform, an RF read/write assembly disposed on a first side of the platform, and an optical reader assembly in electrical communication with the RF read/write assembly. The optical reader assembly is disposed on a second side of the platform opposite the first side. The optical reader assembly is configured to optically read information from the RF-enabled label and communicate the information to the RF read/write assembly that is configured to write the information to a chip of the RF-enabled label.

Mobile data storage device reader having both radiofrequency and barcode scanners

A mobile reader (24) configured to compile a list of data storage devices for transport includes an interface electrically coupled to circuitry modules including RFID scanning circuitry configured to read a unique storage device identifier from each of the data storage devices, and barcode scanning circuitry configured to read the unique storage device identifier from each of the data storage devices. The barcode scanning circuitry communicates with the RPID scanning circuitry. The interface includes a user operable function (106) that enables selectively reading the unique storage device identifier with one of the RFID scanning circuitry or the barcode scanning circuitry to compile a scan list of in-transit data storage devices.

Mobile data storage device reader having both radiofrequency and barcode scanners

A mobile reader (24) configured to compile a list of data storage devices for transport includes an interface electrically coupled to circuitry modules including RFID scanning circuitry configured to read a unique storage device identifier from each of the data storage devices, and barcode scanning circuitry configured to read the unique storage device identifier from each of the data storage devices. The barcode scanning circuitry communicates with the RPID scanning circuitry. The interface includes a user operable function (106) that enables selectively reading the unique storage device identifier with one of the RFID scanning circuitry or the barcode scanning circuitry to compile a scan list of in-transit data storage devices.

Streufeldkompensationssystem für einen Mehrspur-Servo-Aufzeichnungskopf