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7391583 |
Fault tolerant sync mark detection while servo writing a disk drive from spiral tracks
A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal...
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7388729 |
Magnetic recording device and medium having mask pattern
A magnetic recording device includes a composite magnetic head, which includes a recording head and a reproduction head, and a magnetic recording medium. The magnetic recording medium includes a...
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7388728 |
System and method for writing servo sectors in a perpendicular media recording environment
A perpendicular media recording (PMR) servo track writer (STW) system and method for writing servo sectors onto a disk is disclosed. The servo writer includes a head positioner to position a head...
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7382568 |
Circuit and method for detecting a servo wedge on spin-up of a data-storage disk
A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. The processor detects...
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7369351 |
Magnetic disk drive and read/write method to reduce read error rate
Embodiments of the invention reduce the error rate of a read error that is caused by a spacing interval between a write head and a read head, which are formed on a slider. In one embodiment, a...
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7365933 |
Servo information recording method, magnetic recording media, and magnetic disk apparatus
Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each...
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7355810 |
Disk drive having a disk medium with discrete track
According to one embodiment, a disk drive using a disk medium in which servo information is embedding-recorded by a DTR method has a structure wherein a phase-difference servo burst pattern...
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7352526 |
Offset measurement method for magnetic recording head and magnetic recording/reproducing device
A storage device has a separate type magnetic head and a discrete type magnetic recording medium on which recording tracks and recording disabled areas are alternately formed. An accurate offset of...
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7349167 |
Utilizing track identification fields for timing recovery
An apparatus comprises a data storage medium having a plurality of servo sectors and a plurality of data sectors, wherein each of the servo sectors includes a phase locked loop field and a track...
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7342737 |
Off track write protection using filtered position error signal
Methods of filtering a position error signal (PES) indicative of a position of a transducer of a disk drive include obtaining sample position data for the transducer, eliminating selected data of...
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7342734 |
Disk drives with radially aligned servo burst patterns that generate orthogonal contributions to a read signal and related demodulators and methods
A disk drive includes a rotatable data storage disk, a transducer, an actuator, and a servo burst demodulator. The rotatable data storage disk includes a plurality of servo burst patterns thereon....
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7339761 |
Method for wedge time shift calibration in a disk drive
A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in...
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7336438 |
Write control method of hard disk drive, hard disk drive adapting the method and recording medium thereof
The present invention relates to a write control method of a hard disk drive, a hard disk drive adapting the method, and a recording medium storing a program for executing the method. The write...
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7333290 |
Magnetic disk in a disk drive and method having improved null servo burst phasing
Disclosed is a magnetic disk having servo sectors for defining data tracks. Each servo sector includes a preamble field and a null servo burst field. The preamble field is for synchronizing a...
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7333289 |
Magnetic recording and reproducing apparatus, method of controlling the same, magnetic recording medium, and stamper for manufacturing magnetic recording medium
A magnetic recording and reproducing apparatus and a method of controlling the same, capable of increasing the output of a position control signal and performing a precise positioning control of a...
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7319568 |
Magnetic recording media, magnetic recording apparatus, and stamper
A magnetic recording media has a magnetic layer formed on a substrate and includes data regions including a magnetic pattern constituting a recoding track and servo regions including magnetic...
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7319567 |
Servo sector in magnetic disk drive
Embodiments of the invention lower the servo sector's share of each track and ensure that servo sector numbers are reliably determined. According to the embodiment, in the servo sector number (SSA)...
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7317591 |
Servo control for magnetic disk drive
Embodiments of the invention provide a magnetic disk drive that exhibits excellent overall stability of a feedback control system even when the preset frequency for a peak filter significantly...
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7307807 |
Disk servo pattern writing
Systems and techniques to write servo patterns on machine-readable media. In general, in one implementation, the technique includes: obtaining timing information from a spiral servo reference track...
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7286316 |
Method and data storage device for writing patterns onto recording disk
Embodiments of the invention efficiently conduct servo corrections for preventing error propagation during SSW. In an example of the present invention, a servo position signal generator generates a...
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7283320 |
Magnetic recording medium including servo and data bands in the magnetic layer
A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling...
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7271977 |
Method to compensate for microjog error induced by localized track squeeze
A method of reducing microjog errors in a disk drive having a data recording disk with data tracks and a transducer head positionable on the tracks. The head includes a writer element offset from a...
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7268969 |
Repeatable timing mark position error correction in self-servowrite
The periodic component of a timing mark position error of a self-servo write pattern on a disk of a disk drive is determined based on measurements that are made of the timing mark position error at...
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7268963 |
Self-servo-writing multi-slot timing pattern
Self-servo-writing of multi-slot timing patterns is described. Individual timing marks are replaced with groups of timing mark slots. At each timing mark location, a time measurement is made by...
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RE39831 |
Method and apparatus for providing positional information on a disk
The present invention is a method and apparatus for providing positional information of a disk. The disk has at least one side with a plurality of tracks, each having a first burst in a first servo...
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7265931 |
Apparatus to reject disk drive disturbance
Track mis-registration (TMR) correction is conditionally made in a hard disk drive using servo data in a closed loop servo control scheme, along with one or more alternative sensing schemes when an...
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7265930 |
Medium and apparatus for magnetic recording and method for measuring the offset amount
A magnetic recording medium includes a discrete area and an offset amount measurement area. The discrete area has a plurality of magnetic tracks where data can be recorded and that has a...
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7262930 |
Systems and methods for repairable servo burst patterns
The misplacement of a servo burst during a servowriting or self-servowriting process can be corrected by erasing and re-writing that burst. A servo pattern can be selected that has sufficient...
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7253985 |
Delay clock track read back data to compensate time variance due to disk thermal expansion in spiral servo track writing
A method for writing servo information onto a disk of a hard disk drive with a servo writer. The disk has a circumferential index and a band of servo reference tracks. The circumferential index is...
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7242551 |
Method for inspecting track pitch in a magnetic disk
Embodiments of the invention provide techniques to inspect the track pitch of a magnetic disk. In one embodiment, the track pitch is inspected using the servo information that was written onto the...
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7236325 |
Method for formatting a magnetic recording disk with patterned nondata islands of alternating polarity
A method for formatting a magnetic recording disk with patterned nondata islands having alternating magnetization polarity in the along-the-track direction involves clocking write pulses to switch...
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7236324 |
Apparatus, method and system for fabricating servo patterns on high density patterned media
An apparatus, system, and method are disclosed for utilizing a “shadow mask” approach to fabricate servo patterns on high density patterned media. The apparatus may include a deposition mask...
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7230790 |
Magnetic disk drive with servo bursts and alternating magnetic polarity regions therebetween
A disk drive includes a data storage disk that has servo information thereon which includes first servo bursts and second servo bursts. The first servo bursts are at least substantially radially...
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7215502 |
Magnetic recording and reproducing apparatus with trapeziodal write pole tip to avoid overwriting adjacent tracks
A magnetic recording and reproducing apparatus includes a magnetic head having a main magnetic pole, a magnetic recording medium of a discrete type having a predetermined convex-concave structure...
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7212363 |
Magnetic disk apparatus
A magnetic disk apparatus formats a single data frame as a single sector. The magnetic disk apparatus includes a read-out control unit that controls to read-out sector data by emulating an existing...
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7209314 |
Disk drive with phase-quadrature servo pattern and demodulated position error signal insensitive to timing and phase-misalignment errors
A magnetic recording disk drive uses a phase-quadrature position-error-signal (PES) pattern and a servo signal demodulator that is insensitive to clock errors and phase-misalignment errors. The...
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7209313 |
Method for preventing reduction in a reproduced output of a servo signal in a magnetic recording medium
Servo regions are re-magnetized in the present invention. A magnetic storage device measures a first amount which is indicative of the magnitude of magnetization of a servo region, by a read head...
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7203025 |
Magnetic recording medium, magnetic head, and magnetic recording and reproducing device
The magnetic recording and reproducing device has a magnetic recording medium, a recording head for writing magnetic data on the magnetic recording medium, and a reproducing head for reading...
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7203024 |
Method of testing servo burst signals of hard disk drive and recording medium adapted therefor
A method of testing quality of a servo burst signal recorded on a hard disk drive and a recording medium adapted therefor, the hard disk drive including a plurality of sectors within one track and...
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7203023 |
Magnetic recording unit and magnetic recording medium
The present invention provides a magnetic recording unit, including: a magnetic head; a magnetic recording medium having a servo pattern for adjusting a position of the magnetic head; a frequency...
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7196865 |
Recording apparatus having discoid record mediums
A recording apparatus capable of securely reading out data for causing a head to follow along circular tracks set virtually. Therefore, on-track control along the virtual tracks is possible by the...
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7167335 |
Systems for variable multi-pass servowriting and self-servowriting
The amount of position error written into a servo burst pattern can be reduced by using additional media revolutions to write the pattern. Where the edges of two servo bursts are used to define a...
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7158337 |
Method and apparatus for providing positional information on a disk
The present invention is a method and apparatus for positioning a read/write head in a hard disk drive. The method comprises providing a disk having a at least one side with a plurality of tracks,...
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7158333 |
Up-sampled filtering for servo demodulation
An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error...
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7154690 |
Dynamic shock detection in disk drive using accumulated average position error
Dynamically detecting off-track errors in a disk drive by adjusting transducer head position control parameters in response to shock events. In an embodiment, shock events with large magnitude...
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7154689 |
Apparatus for writing servo bursts on a disk with servo track pitch based on read element width and methods of manufacturing same
Methods for making a disk drive, apparatus for writing servo bursts on a disk, and disk drive apparatus are provided. The disk drive includes a disk and transducer adjacent to the disk. The...
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7139150 |
Method and system for head position control in embedded disk drive controllers
A track follow controller (“TFC”) in an embedded disk controller is provided. The TFC includes, a position error calculator that determines a linear position of a head based on burst format and...
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7136252 |
Magnetic recording and reproducing apparatus with recording layer having predetermined convex-concave pattern
In the present invention, with respect to a convex-concave structure necessary for respective functions of a servo area in a perpendicular magnetic recording medium, a specification of...
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7133243 |
Burst position error data write method and magnetic disk unit
A magnetic disk unit writes, on a magnetic disk, a burst position error data which is used for correcting a positional error of a burst pattern which is used for correcting an error within one...
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7130146 |
Two-pass-per-track servo burst patterns
A rotatable storage media includes multiple concentric data tracks and servo sectors embedded within the tracks. In some embodiments, the servo sectors have servo burst patterns including a...
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