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7623317 |
Magnetic disk device and magnetic recording medium
A magnetic disk device has a magnetic recording medium in which one servo track and an array of at least one data track are formed alternately. A head portion includes a set of reading heads...
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7623313 |
Method and apparatus for performing a self-servo write operation in a disk drive
The present invention is directed to a method and apparatus for performing a self-servo write operation in a disk drive. In one embodiment, the disk drive includes a disk surface having a read head...
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7623311 |
Recording media, recording and reproducing apparatus, and method for recording and reproducing
A magnetic recording layer is formed on a surface of a substrate in magnetic recording media to define magnetic recording regions. Magnetic missing portions are provided in the magnetic recording...
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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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7616134 |
Systems and methods for enumerative encoding and decoding of maximum-transition-run codes and PRML (G,I,M) codes
Systems and methods for encoding/decoding are provided. The systems and methods include encoding a stream of K-bit input sequences into a stream of (G, I, M)-constrained 2N-bit output sequences by...
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7613975 |
Predictive diagnosis of a data read system
A data read system comprising a read channel for processing a signal, and a diagnostic controller in communication with the read channel. The diagnostic controller is configured to measure at least...
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7612961 |
Magnetic recording disk and disk drive with patterned phase-type servo fields for read/write head positioning
A magnetic recording disk drive uses a disk having pre-patterned servo sectors extending generally radially across the data tracks. The servo sectors include at least two position error signal...
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7612960 |
Method for formatting data sectors on magnetic disk, and magnetic disk drive
Embodiments of the present invention efficiently format long sectors, without decreasing the performance, in a magnetic disk drive in which servo sectors are radially formed at regular intervals,...
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7612959 |
Method for correcting added and lost bits in a hard disk drive using error correction codes
A hard disk drive with an encoder that writes data onto a disk in accordance with a plurality of first codes. Each code contains a plurality of digital bits. The first codes are selected so that if...
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7606129 |
Disk controlling apparatus and computer product
A disk apparatus writes and rewrites data in a storage disk and reads data from the storage disk. A disk controlling apparatus that controls the disk apparatus includes an environment information...
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7603026 |
Information processing method and information processing apparatus
This invention provides an information processing method and apparatus, which can set all extent sizes of data divisionally recorded on a disk to be equal to or larger than the minimum recording...
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7602574 |
Storage apparatus, storage medium, and control method and program of storage apparatus
In a storage medium to which information is recorded by using a write head of an inductive type, in addition to a servo section in which servo information is recorded and a data section to which...
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7599139 |
Disk drive having a high performance access mode and a lower performance archive mode
A disk drive is disclosed including a disk having a plurality of tracks, and a head actuated over the disk. A write frequency of write data received from a host is monitored. When the write...
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7597792 |
Magnetic recording disk having DTR patterned CSS zone
A method and apparatus is described for gradually transitioning a slider from operation over a patterned data zone to landing on a patterned CSS zone. The ratio of raised area width to recessed...
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7595950 |
Robust data storage techniques for two-sided data storage tape
In an embodiment, a data storage tape includes a first side including recorded data and a second side including recorded error correcting code data for the recorded data on the first side. In...
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7593177 |
Recording/reproducing method of magnetic tape
In a recording/reproducing method of a magnetic tape in a tracking servo system, a recording density of each data track is increased while inhibiting occurrence of a recording/reproducing error...
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7589930 |
Zone based repeated runout error compensation
Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least...
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7589926 |
Methods and apparatus for formatting memory media
At least one rotating memory medium such as a hard disk is installed in a hard disk drive or the like. The disk drive has a controller, controller memory and one or more heads for writing and...
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7589925 |
Method of accessing variable density data tracks in a disk drive
A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk...
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7587538 |
Disk controller, channel interface and methods for use therewith
A channel interface couples a channel circuit to a controller circuit of a disk drive, the channel circuit includes a channel register and the controller circuit includes a controller register used...
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7586707 |
Magnetic disk drive with increased storage capacity
Embodiments of the invention provide a magnetic disk drive capable of reducing an area used for a preamble of each data sector to increase the storage capacity. The magnetic disk drive adopts a...
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7584340 |
System and method for pre-provisioning storage in a networked environment
System and method for pre-provisioning data storage in a network storage environment. Embodiments may pre-provision more storage than needed and make the spare storage available to two or more...
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7583460 |
Edge controlled fast data pattern generator
Fast data patterns with desired edge positions are provided. A pattern generator (PG) circuit 10 stores and provides data patterns and respective position control data. A delay circuit 16 ...
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7580212 |
Magnetic disk having efficiently stored WRRO compensation value redundancy information and method for using the redundancy information
The present invention may be embodied in a magnetic disk, of a disk drive, having eight-bit fields storing wedge repeatable runout (WRRO) compensation values and redundancy information. The WRRO...
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7580211 |
DVD recording
A DVD recorder including a multiplexer that stores multiplexed audio data and video data in a memory device, and a data scrambler that reads the multiplexed data from the memory device and...
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7573667 |
Servo information write method and apparatus
Embodiments of the invention provide a servo information write method that makes it possible to properly locate the last-written servo information even when old servo information is overwritten by...
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7573666 |
Optimizing storage capacity by smoothly varying track pitch across a disk surface
A method for operating a fixed media hard disk drive using a plurality of disks on each of which the ratio of servo track pitch to data track pitch is smoothly varied across the surface of the disk...
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7573664 |
Integrated multiple channel data reliability testing for a magnetic tape drive
Data reliability testing for a magnetic tape drive is conducted separately for the channels of a magnetic tape drive which write and read tracks of a multiple track magnetic tape. Memory stores...
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7567403 |
Bi-directional servo track writing to minimize sidewall writing at high skew angles
An apparatus and associated method of servo writing to a storage media is provided that writes servo information at a first orientation pattern from a first storage extent of the storage media to a...
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7564637 |
Storage media having areas for storing data for correcting servo information errors
A storage medium includes tracks extending in a circumferential direction, user data areas formed on the tracks for storing user data, and servo frames corresponding to the user data areas and...
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7561360 |
Magnetic recording medium
A magnetic recording medium includes a substrate and a recording layer formed on the substrate. The recording layer is provided with a plurality of information tracks each having a track servo...
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7561359 |
Spiral servo patterns with absolute reference point
The present invention is directed to a method and apparatus for providing an absolute reference point on a disk surface of a disk drive. A write head associated with the disk surface is used to...
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7554768 |
Information recording medium with concave/convex servo pattern having decreasing unit convex part length ratio
On an information recording medium, a data track pattern and a servo pattern composed of a concave/convex pattern including a plurality of convex parts are formed on at least one surface of a...
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7554760 |
Recording/reproducing apparatus and method of measuring a parameter
A recording/reproducing apparatus includes: a magnetic recording medium on which data track patterns are formed in data track pattern regions by a pattern with recording regions and non-recording...
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7551387 |
Servo writing with offset compensation for prewritten reference
In accordance with various embodiments, a rotatable member is mounted to a spindle hub so that initial servo data previously provided to the rotatable member are eccentrically offset with respect...
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7551380 |
Method for writing a servo pattern in tape
A tape has a component of magnetization pointing out of a plane of the tape. To write a pulse of a servo pattern to the tape, the tape is passed over a write head with a conventional write gap....
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7551378 |
Tri-state servowriter driver with slow return to zero
A method and apparatus for writing timing-based magnetic servo band patterns on magnetic storage media. The apparatus includes a magnetic head and a tri-state driver. The driver is adapted to...
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7548388 |
Magnetic recording medium, recording/reproducing apparatus, and stamper
On a magnetic recording medium, M sets of burst patterns are formed along a direction of rotation of a substrate in each burst pattern region, where M is a natural number of two or higher. Each...
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7538962 |
Media event timer and methods for use therewith
A media event timer includes a counter module for generating a sequence of counts based on a clock signal of a disk drive unit. A counter reset module sets the counter module to a reset count in...
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7522372 |
Servo track having periodic frames of tone field and embedded synchronization marks
Methods and systems for sensing a position of a transducer head with respect to a storage medium. One method includes generating a read signal from a servo track stored on a magnetic storage...
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7522363 |
Medium storage device and medium rotation synchronization processing method for medium storage device
A medium storage device writes or read data on a storage medium synchronizing the rotation of the storage medium with the DSW method for decreasing the gap length considering the rotation jitter....
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7522362 |
Amplitude servo pattern, magnetic recording medium and the manufacturing method, patterned magnetic transfer master substrate used in the manufacturing method, and magnetic recording/reproducing apparatus
An amplitude servo pattern capable of providing accurate servo control through reproduced amplitude with reduced noise is provided. The amplitude servo pattern has servo burst signals composed of...
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7511908 |
Magnetic-polarity encoded servo position information for magnetic-based storage media
A magnetic storage media includes a magnetic south-north servo band section and a magnetic north-south servo band section. The magnetic south-north servo band section includes a magnetic south-pole...
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7511907 |
Stepped time based servo pattern and head
The present invention relates to apparatuses and methods used in manufacturing magnetic tape. More specifically, the present invention relates to a method of writing a servo pattern on magnetic...
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7508611 |
Disk drive clock circuit that adjusts clock edge timing in response to servo information and methods thereof
A disk drive clock circuit includes a servo clock generator and a disk locked frequency converter. The servo clock generator generates a servo clock signal in response to servo information read...
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7508610 |
Method and apparatus for recording servo frame, storage disk, and method and apparatus for obtaining servo frame information
A servo-frame recording apparatus includes: a sector information rearranging section for rearranging serial bits of the sector information that is binary data; a first ExOR section for performing...
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7508609 |
Formatted storage media providing space for encrypted text and dedicated space for clear text
A storage library is provided for formatting a mobile data storage element, such as a tape, with a first space dedicated for clear text or text as received by a host, such as an Independent...
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7502197 |
Disk drive demodulating a time-based servo pattern
A disk drive is disclosed including a disk having a first and second set of time-based servo patterns. The first set of time-based servo patterns comprises a first cyclical pattern that repeats...
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7502187 |
Address mark detection
A recording system, such as a magnetic or optical recording system, employs an address mark (AM) detector that searches for an address mark pattern that is augmented by one or more bits of a...
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7502185 |
Method and system for determining spin pad length
Method and system for determining spin pad length in a data storage system. The data storage system has a data storage medium having at least one track for storing a plurality of data sections, a...
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