Data In Specific Format Patents (Class 360/48)
  • Patent number: 8134798
    Abstract: A disk drive is disclosed having a plurality of disk surfaces, wherein each disk surface comprises a plurality of data tracks, and each data track comprises a plurality of data sectors. When a read command is received from a host, data is read from first and second data sectors on first and second disk surfaces, respectively, in response to the read command, wherein the first data sector stores data at a first data rate, and the second data sector stores data at a second data rate substantially less than the first data rate. The data is transferred to the host at a substantially constant average transfer rate. In this manner, the disk drive does not appear abnormal to a benchmark program that reads a plurality of data sectors across multiple disk surfaces.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: March 13, 2012
    Assignee: Western Digital Technologies, Inc.
    Inventors: Gregory B. Thelin, Dalwinder Singh
  • Patent number: 8130459
    Abstract: A method includes writing data to a bit-patterned media at times determined by a clock having a period that is offset from a bit island period by a fixed offset to create one insertion or one deletion approximately within a predetermined number of bit islands, reading the data, and correcting the read data using error correction. An apparatus that implements the method is also provided.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: March 6, 2012
    Assignee: Seagate Technology LLC
    Inventors: Deepak Sridhara, Ching He, Arvind Sridharan, Raman Venkataranmani
  • Patent number: 8130460
    Abstract: An apparatus and method are disclosed for writing data accumulated in a buffer on a tape medium in such a way that overwriting is prevented. The apparatus comprises a write unit configured for writing first data in a first position extending over a first track and an area adjacent to the first track, writing second data in a second position extending over a second track and an area adjacent to the second track, and writing the first data and the second data in a third position extending over a third track and an area adjacent to the third track. Furthermore, the apparatus comprises a processing unit configured for preventing the first data written in the first position from being overwritten with the second data written in the second position or with the first data written in the third position.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: March 6, 2012
    Assignee: International Business Machines Corporation
    Inventors: Yutaka Oishi, Hirokazu Nakayama, Setsuko Masuda, Kenji Nakamura
  • Patent number: 8130458
    Abstract: Data storage systems are provided. Data storage systems illustratively include a recording head having a writing element and a bit patterned medium having a plurality of media dots. In some embodiments, the plurality of media dots pass the recording head at a media dot frequency. In some embodiments, the writing element writes data to the bit patterned media at a writing frequency that is less than the media dot frequency.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: March 6, 2012
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Housan Dakroub
  • Patent number: 8125725
    Abstract: Methods, systems and computer program products for measuring a distance between a write head and a read head are described. The measured distance allows the position of the write head (e.g., during writing) and read head (e.g., during reading) to be compensated. The compensation further allows a hard disk drive to accurately position the read head over a desired sector without displacing the write head from the sector.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: February 28, 2012
    Assignee: Marvell International Ltd.
    Inventor: Kiyotada Ito
  • Patent number: 8120868
    Abstract: A storage medium format is provided having a first band of a plurality of consecutive data storage tracks having user data stored thereto, a second band of a plurality of consecutive data storage tracks having other user data stored thereto, and a guard track medially disposed therebetween the first band and the second band and having system data stored thereto.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: February 21, 2012
    Assignee: Seagate Technology LLC
    Inventors: Qiang Bi, KianKeong Ooi, TaiVie Chiang, WingKong Chiang, Edmun ChianSong Seng, Jimmy Pang, BengWee Quak, UttHeng Kan, Xiong Liu, Ricardo SoonLian Lim, Patrick TaiHeng, MingZhong Dong, WeiMing Yeow
  • Patent number: 8120869
    Abstract: A magnetic recording medium having a magnetic pattern magnetically partitioning a magnetic layer, formed on a non-magnetic substrate, wherein the magnetic pattern is comprised of magnetic regions and non-magnetic regions surrounding each of the magnetic regions, the non-magnetic regions form depressions, the magnetic pattern comprises data areas and servo information areas, and the difference between the areal ratio of the depressions in the data areas and the areal ratio thereof in the servo information areas is within ±10%. The magnetic areas preferably comprise a magnetic layer having a granular structure comprised of magnetic grains each surrounded by an oxide, or a two-layer structure comprising the granular structure and a non-granular structure formed on the granular structure. The magnetic recording medium exhibits stable head-floating characteristics, and thus, the largest floating height can be reduced, and a high recording density can be obtained.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: February 21, 2012
    Assignee: Showa Denko K.K.
    Inventor: Masato Fukushima
  • Patent number: 8116022
    Abstract: According to one embodiment, a magnetic recording apparatus includes a magnetic recording medium including magnetically recordable recording tracks with a width L1, non-recording sections each provided between adjacent recording tracks, and a wide land track having a width L2 larger than the width L1 of the recording tracks, and a head slider including read and write heads.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: February 14, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakurai, Kazuto Kashiwagi
  • Patent number: 8116023
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of servo sectors defining a plurality of servo tracks, and a head actuated radially over the disk for generating a read signal. Each servo sector comprises a preamble comprising a first end and a second end, and each servo sector comprises a servo sync mark after the second end of the preamble. The servo tracks form a plurality of servo zones, wherein a servo data rate of the servo sectors in a first servo zone is different than a servo data rate of the servo sectors in a second servo zone. The first end of the preambles in the servo sectors are aligned along a radius of the disk across at least the first servo zone and the second servo zone.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: February 14, 2012
    Assignee: Western Digital Technologies, Inc.
    Inventor: Hanan Kupferman
  • Publication number: 20120033321
    Abstract: A method for physically laying out data on tape is disclosed herein. In one embodiment, such a method includes receiving a data set, wherein the data set includes S sub data sets (SDSs) of fixed size and each SDS includes N codeword interleaves (CWIs). The method further distributes the CWIs for the S SDSs across T tracks on a physical tape medium such that the distances between CWIs of the same SDS are substantially maximized on the physical tape medium. To maximize the distances, the method periodically rotates the tracks within the data set by a track rotation value R, wherein the number of tracks T is equal to 2k, and the track rotation value R is equal to 2k?1?1. A corresponding apparatus is also disclosed herein.
    Type: Application
    Filed: August 3, 2010
    Publication date: February 9, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Roy D. Cideciyan, Thomas Mittelholzer, Kenji Ohtani, Paul J. Seger, Keisuke Tanaka
  • Patent number: 8111475
    Abstract: According to one embodiment, a magnetic recording medium to which a signal is recorded by reversing magnetization of a magnetic body, includes: a servo region to which a servo signal is written; a data region configured to include a magnetic region of a track to which data is written, the magnetic region being separated from other magnetic region of other track; and a periodic magnetic pattern region configured to be provided at a head portion of the data region following the servo region, and is inclined at a predetermined angle with respect to a circumferential direction of the magnetic recording medium, over a predetermined length in a radius direction of the magnetic recording medium.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: February 7, 2012
    Assignee: Toshiba Storage Device Corporation
    Inventor: Motomichi Shibano
  • Patent number: 8111474
    Abstract: A magnetic storage apparatus has a reproducing head to reproduce information from a perpendicular magnetic recording medium that is recorded with servo information, eccentricity correction data and read/write data. The apparatus further has a filter part to filter a reproduced output of the reproducing head by filtering the servo information which has a differentiated waveform by a non-differentiating characteristic and by filtering the eccentricity correction data and the read/write data which have rectangular waveforms by a differentiating characteristic, a demodulating part to demodulate the servo information, the eccentricity correction data and the read/write data that are filtered by the filter part, and a servo system to carry out a control process including an eccentricity control based on the servo information and the eccentricity correction data that are demodulated.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: February 7, 2012
    Assignee: Toshiba Storage Device Corporation
    Inventors: Tsugito Maruyama, Sumio Kuroda
  • Patent number: 8107186
    Abstract: In a magnetic tape drive having a servo read system with at least one read head, the system configured to read servo pattern information as a magnetic tape is moved longitudinally with respect to the at least one read head, the servo pattern comprising a timing-based servo pattern comprising an even number of bursts of sloped magnetic stripes, adjacent bursts oppositely sloped, alternate bursts identically sloped, an embodiment of a method determines the time between detection from the read head of a same stripe of alternate bursts of a pattern; determines the time between detection from the read head of stripes of a burst of a pattern; and determines a ratio of the determined times. The ratio is compared to a threshold, wherein the threshold comprises a differentiation between different servo pattern types.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: January 31, 2012
    Assignee: International Business Machines Corporation
    Inventors: Nhan Xuan Bui, Giovanni Cherubini, Jens Jelitto, Kazuhiro Tsuruta
  • Patent number: 8102615
    Abstract: A data storage apparatus includes: a medium for storing data having synchronization marks and data blocks, the synchronization mark and the data block being allocated alternately in the circumference direction of the medium; a head writing data into or reading out data from the medium; and a processor for executing a process including: reading out synchronization marks, measuring time for the head to pass through each of the data blocks based on signals read out from each of the synchronization marks in the circumference direction, generating write/read clock for each of the data blocks, which is continuously changing in speed, by calculating difference in time for the head to pass through the each one of the data blocks and its adjacent one of the blocks on the basis of the time measured, and writing data into or reading out data from the medium in synchronization with the write/read clock.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: January 24, 2012
    Assignee: Toshiba Storage Device Corporation
    Inventors: Akihiro Itakura, Toshikazu Kanaoka
  • Patent number: 8102616
    Abstract: According to one embodiment, there is provided a magnetic recording medium having a data region in which a plurality of recording tracks, each including magnetic dots arrayed in a down-track direction with a pitch p, are formed in a cross-track direction, and a servo region including a preamble in which a plurality of lines of magnetic dots, which are arrayed in a cross-track direction with a pitch p, are formed at equal intervals in the down-track direction.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: January 24, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakurai, Kazuto Kashiwagi, Akira Kikitsu
  • Patent number: 8097351
    Abstract: A magnetic recording apparatus has a magnetic recording media including a substrate and a magnetic layer containing magnetic patterns on the substrate, the magnetic layer including data zones to constitute recoding tracks and servo zones, the magnetic patterns of the servo zones being used as address bits, and a magnetic head configured to read signals from the magnetic recording media while flying over the magnetic recording media, in which, in a case where two magnetic patterns used as address bits on the servo zones corresponding to two adjacent recording tracks are arranged in such a manner that one corner of one magnetic pattern is closest to one corner of the other magnetic pattern, the corners of the two magnetic patterns are substantially separated from each other.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: January 17, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takeshi Okino, Seiji Morita, Yoshiyuki Kamata, Satoshi Shirotori, Masatoshi Sakurai, Hiroaki Nakamura
  • Patent number: 8098448
    Abstract: A method for dividing a data area on a disk into a plurality of concentric zones and determining a format for each zone so that data tracks in the zone have the same number of data sectors. The method includes dividing a data area into a plurality of zones with provisional boundaries. The method also includes determining a linear recording density for a selected zone. The method further includes selecting the number of data sectors per data track corresponding to the determined linear recording density from specified values. Moreover, the method includes resetting a boundary of the zone at a new boundary shifted from the provisional boundary according to a selected value.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: January 17, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Yoshihiko Maeda, Masaomi Ikeda, Nobuhiro Kuwamura, Toshihiko Tsunokawa, Akira Osaki
  • Patent number: 8094398
    Abstract: According to one embodiment, address information is expanded on a bit map in order to generate original address information which is divided in a direction of the abscissa to form groups. The demodulated values of the original address information are obtained as original intra-group demodulated values. New address information is obtained and an arrangement pattern of bits in the servo area determined based on the new address information on a bit map formed by integrating obtained new address information items of the groups.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: January 10, 2012
    Assignee: Toshiba Storage Device Corporation
    Inventor: Hiroyuki Suzuki
  • Publication number: 20120002317
    Abstract: In a controller of a tape drive, a CM input-output unit recognizes a tape format; a tape variable acquisition unit acquires tape variables; a setting variable acquisition unit acquires setting variables; and a minimum number calculator calculates a minimum number m of sub datasets, which are to be written to a tape to secure resistance to burst error, by using the tape variables and setting variables. When a command processor receives a synchronization command, the buffer manager generates n sub datasets for storing data in the buffer. If n is smaller than m, m sub datasets are padded out and set as write data. If n is m or more, the n sub datasets are set as write data. Then, the channel input-output unit writes the write data to the tape.
    Type: Application
    Filed: June 24, 2011
    Publication date: January 5, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Takamasa HIRATA, Setsuko MASUDA, Yuhko MORI, Yutaka OISHI, Tomoko TAKETOMI, Terue WATANABE
  • Patent number: 8089716
    Abstract: Provided is a magnetic tape that includes a data band, including servo patterns, data, and a guard space. The servo patterns is formed along a longitudinal direction of the magnetic tape with an interval provided between each of the servo patterns, each of the servo patterns formed across a full width of the data band. The data is recorded between the servo patterns. The guard space is left between each of the servo patterns and the data.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: January 3, 2012
    Assignee: Sony Corporation
    Inventors: Jun Takayama, Seiji Kumagai
  • Patent number: 8089715
    Abstract: Formatting a storage disk is disclosed. A first portion of a sector of the storage disk is defined. The first portion precedes a defect and has a first length that varies based on a detected location of the defect. A second portion of the sector of the storage disk is defined. The second portion follows the defect and has a second length that varies based on the detected location of the defect.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: January 3, 2012
    Assignee: Link—A—Media Devices Corporation
    Inventors: Kwok W. Yeung, Kin Ming Chan
  • Publication number: 20110317304
    Abstract: Disclosed is a magnetic recording/reproduction device 2 including: a recording/reproduction head 7; and a recording/reproduction head 7 for detecting a leakage magnetic field of each of the plurality of magnetic recording cells 1 so as to reproduce information, the recording/reproduction head 7 carrying out the recording on the magnetic recording medium 4 so that the magnetic recording medium 4 includes continuous recording regions that (i) satisfy Nmin?2 and that (ii) include a continuous recording region that satisfies N?n×Nmin, where N represents a number of magnetic recording cells 1 in a continuous recording region; Nmin represents a minimum value for N; and n represents a positive integer, the continuous recording regions each being a region on a reproduction track in which region magnetic recording cells 1 sharing an identical magnetization direction are sequentially arranged in a circumferential direction of the magnetic recording medium 4.
    Type: Application
    Filed: June 10, 2011
    Publication date: December 29, 2011
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Toshihiko Sakai, Yoshiteru Murakami
  • Patent number: 8085487
    Abstract: A method is disclosed for selecting a format for a disk surface of a disk drive, the disk drive comprising the disk surface, and a head actuated over the disk surface. A first TPI is selected for the disk surface, and then evaluated to determine whether it is compatible with a first target capacity. If the first TPI is not compatible with the first target capacity, then a second TPI is selected for the disk surface wherein the second TPI is less than the first TPI.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: December 27, 2011
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kameron Kam-Wai Jung, Hwee C. Chia
  • Patent number: 8085486
    Abstract: In a method for causing data to be written to a non-volatile medium, first data to be encoded and written in a sector of the non-volatile medium as a codeword is transmitted to a write or read/write channel device, and a write gate signal corresponding to the sector is asserted. Asserting the write gate signal indicates to the write or read/write channel device when to write the codeword to the sector. While asserting the write gate signal to cause the codeword to be written, second data to be encoded and written to the non-volatile medium is transmitted to the write or read/write channel device.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: December 27, 2011
    Assignee: Marvell International Ltd.
    Inventor: Yat-tung Lam
  • Patent number: 8081396
    Abstract: A device for processing data recorded on a tape medium includes a first control part that controls a read head to read specific data recorded in a first area among data recorded in a first format on the tape medium. Data in the first format is recorded at a first recording density. The device further includes a second control part that controls a write head to write the specific data in a second area different from the first area of the tape medium and to write the specific data in a second format in a third area different from the second area of the tape medium. Data in the second format is recorded at a second recording density different from the first recording density. Moreover, the device may include a recording part for recording specific information that specifies a read position of other data among data recorded in the first format on the tape medium.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: December 20, 2011
    Assignee: International Business Machines Corporation
    Inventors: Takashi Katagiri, Yutaka Oishi
  • Publication number: 20110304935
    Abstract: A hard disk drive that includes a disk with data written onto a plurality of tracks, a spindle motor that rotates the disk, and a head that is coupled to the disk. The disk drive also includes a circuit that writes data onto a first writable shingle band of tracks if the first writable shingle band is adjacent to a guard band of tracks. The first writable shingle band includes a number of tracks that is a function of a head width. The guard band of tracks is capable of becoming a writable shingle band. Changing the designation of a shingle band between guard and writable creates floating guard bands. The creation of floating guard bands allows for the writing of a single band without having to move and restore adjacent tracks until reaching a fixed guard band as required in the prior art.
    Type: Application
    Filed: June 10, 2010
    Publication date: December 15, 2011
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Dar-Der Chang, Keng Hong, Byeung Jun Lee, Xin Guo
  • Publication number: 20110304936
    Abstract: A data demodulating device which converts an RLL code string obtained by converting a data string in which information bits including a special bit having a value representing the content of a signal process at the time of demodulating data within a target section included in an input signal are inserted with a constant interval in accordance with a modulation table having a variable length conversion rule, in accordance with a demodulation table corresponding to the modulation table, includes: a shaping unit configured to subject to two or more signal processes; and a selecting unit configured to select the content of the signal process by the shaping unit based on the information bits.
    Type: Application
    Filed: May 16, 2011
    Publication date: December 15, 2011
    Applicant: Sony Corporation
    Inventor: Toshiyuki NAKAGAWA
  • Patent number: 8077425
    Abstract: A magnetic disk apparatus includes a magnetic disk that includes a plurality of zones in which a plurality of tracks are arranged for each of circumferences of a spiral, and gaps that are arranged between the zones to have a width a predetermined number of times larger than a track width and that are regions without providing recording bits; and a reproducing element that simultaneously makes an access to the recording bits contained in the tracks, reading information stored in the recording bits, wherein the number of the tracks is one or larger and a sum of one and the predetermined number or smaller in one of the zones.
    Type: Grant
    Filed: August 17, 2009
    Date of Patent: December 13, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasushi Tomizawa, Kohsuke Harada, Hiroaki Nakamura, Yoshiyuki Ishihara, Shinji Takakura
  • Patent number: 8077416
    Abstract: A magnetic recording medium has a RAM region and a ROM region. The RAM region includes a plurality of first tracks each having a first magnetic portion. The first magnetic portions in adjacent tracks are separated from each other. The ROM region includes a plurality of second tracks each having a second magnetic portion. A width of the second magnetic portions in a direction perpendicular to a track direction of the first tracks is larger than that of the first magnetic portions in the perpendicular direction.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: December 13, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakurai, Seiji Morita, Akira Kikitsu, Yoshiyuki Kamata
  • Patent number: 8068301
    Abstract: Magnetic media made using planar magnetic heads. A head may comprise a substrate having conductive thru-hole vias extending therethrough, a first magnetic layer deposited and patterned on the substrate, a first insulation layer deposited and patterned on the first magnetic layer, a conductive coil layer deposited and patterned on the first insulation layer and connected to the conductive thru-hole vias, a second insulation layer deposited and patterned on the conductive coil layer, vias patterned into the insulation layer extending to the first magnetic layer, a second magnetic layer deposited in the vias, and a third magnetic layer deposited and patterned on the second insulation layer and second magnetic layer. The third magnetic layer may be connected to the first magnetic layer through the second magnetic layer deposited in the vias of the insulation layers.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: November 29, 2011
    Assignee: Advanced Research Corporation
    Inventor: Matthew P. Dugas
  • Patent number: 8068302
    Abstract: Methods of formatting media using planar magnetic heads. A head may comprise a substrate having conductive thru-hole vias extending therethrough, a first magnetic layer deposited and patterned on the substrate, a first insulation layer deposited and patterned on the first magnetic layer, a conductive coil layer deposited and patterned on the first insulation layer and connected to the conductive thru-hole vias, a second insulation layer deposited and patterned on the conductive coil layer, vias patterned into the insulation layer extending to the first magnetic layer, a second magnetic layer deposited in the vias, and a third magnetic layer deposited and patterned on the second insulation layer and second magnetic layer. The third magnetic layer may be connected to the first magnetic layer through the second magnetic layer deposited in the vias of the insulation layers.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: November 29, 2011
    Assignee: Advanced Research Corporation
    Inventor: Matthew P. Dugas
  • Patent number: 8068303
    Abstract: Various embodiments for writing data in a tape medium having wraps by a tape drive are provided. The tape drive allocates the wraps in a shingled data band between two or more data partitions. A set of contiguous wraps is allocated to one data partition of the two or more data partitions. An additional set of contiguous wraps is allocated to an additional data partition of the two or more data partitions. A minimum buffer is retained between the set and the additional set of contiguous wraps of at least one wrap per direction written within at least one data band shared between the one and the additional data partitions such that the one and the additional data partitions may be written to by the tape drive independently of each other.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: November 29, 2011
    Assignee: International Business Machines Corporation
    Inventor: Glen A. Jaquette
  • Patent number: 8068300
    Abstract: Planar magnetic heads and methods of making the same using a built-up approach and thru-hole via technology to achieve a true planar head. A head may comprise a substrate having conductive thru-hole vias extending therethrough, a first magnetic layer deposited and patterned on the substrate, a first insulation layer deposited and patterned on the first magnetic layer, a conductive coil layer deposited and patterned on the first insulation layer and connected to the conductive thru-hole vias, a second insulation layer deposited and patterned on the conductive coil layer, vias patterned into the insulation layer extending to the first magnetic layer, a second magnetic layer deposited in the vias, and a third magnetic layer deposited and patterned on the second insulation layer and second magnetic layer. The third magnetic layer may be connected to the first magnetic layer through the second magnetic layer deposited in the vias of the insulation layers.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: November 29, 2011
    Assignee: Advanced Research Corporation
    Inventor: Matthew P. Dugas
  • Patent number: 8064157
    Abstract: A magnetic disk includes: a data recording region having first magnetic parts; the first magnetic parts being arranged in a circumferential direction in the nonmagnetic region and form tracks, and the tracks being arranged in a radial direction at a track pitch Tp; and a burst pattern region having burst patterns making a magnetic head follow the first magnetic parts, the burst patterns having second magnetic parts, the second magnetic parts forming base units arranged at a pitch Sp in a radial direction of the disk, the pitch Sp being more than twice as large as the track pitch Tp, the base units including a plurality of base units arranged in a circumferential direction of the disk, and the base units adjacent to each other in the circumferential direction being displaced from each other by the pitch Sp in the radial direction of the disk.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: November 22, 2011
    Assignee: Fujitsu Limited
    Inventor: Yukio Hirai
  • Patent number: 8059351
    Abstract: According to one embodiment, a magnetic recording apparatus includes: an information recording module configured to record a predetermined number of lines of information with a predetermined length in an information recording region of a magnetic recording medium, each of the lines of information having a same recording start position with respect to a relative movement direction of the magnetic recording medium and a recording element, the each of the lines of information being provided with an overlaying portion of adjacent lines of information. The information recording module is configured to record clock information in one or a plurality of the lines of information.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: November 15, 2011
    Assignee: Toshiba Storage Device Corporation
    Inventor: Hiroshi Mutoh
  • Patent number: 8059352
    Abstract: Patterned-media magnetic recording disks are made from a master template that has nondata regions that contain a pattern of one or more discrete nondata islands and discrete gaps, with the pattern representing a scrambled number. All disks made from the master template, or from replica molds made from the master, will have the same patterns. When the disks are DC-magnetized so that all the nondata islands are magnetized in the same direction, these patterns will include one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps that are scrambled in a pseudo-random manner. During operation of the disk drive the patterns are detected by the read head and interpreted within the disk drive using knowledge of the pseudo-random scrambling function, so that reading and writing of data can occur in the conventional manner. If the disks are copied in an attempt to replicate the master template, the resulting disks will be inoperable in a disk drive because of the scrambling.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: November 15, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Zvonimir Z. Bandic, Jorge Campello de Souza, Cyril Guyot, Bruce Alexander Wilson
  • Patent number: 8059350
    Abstract: A patterned-media perpendicular magnetic recording disk has patterned servo regions and is nanoimprinted from a master mold made using directed self-assembly of block copolymers. The disk has patterned concentric circular data tracks of discrete data islands, with the tracks having a track pitch in the radial or cross-track direction. The disk also has patterned servo sectors extending generally radially across the patterned data tracks. The servo pattern is a chevron pattern of slanted or non-radial stripes that have a stripe pitch in the cross-stripe direction substantially equal to the track pitch. As a result of the method of making the master mold, the nanoimprinted disk has a chevron servo pattern with non-radial stripes that are magnetized segments of radial lines separated by nonmagnetic spaces.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: November 15, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Thomas R. Albrecht, Jonathan Darrel Coker, Ricardo Ruiz, Bruce Alexander Wilson
  • Patent number: 8054569
    Abstract: A method and apparatus is presented to determine a lateral position of a read/write head relative to a sequential information storage medium having a servo signal encoded therein and moving adjacent to the read/write head, where the servo signal comprises a plurality of pulses. The method includes detecting the servo signal using the read/write head and calculating a timing interval between each of the pulses using a clock rate of a clock signal. The clock rate is then adjusted based upon the velocity of the sequential information storage medium.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Nhan Xuan Bui, Reed Alan Hancock, Shuhei Nadehara, Eiji Ogura, Kazuhiro Tsuruta
  • Patent number: 8055842
    Abstract: Systems and methods for using RAID with ATA mass storage devices can benefit from operating system optimizations for avoiding unaligned write accesses. When the ATA mass storage devices in the RAID array have different physical sector sizes, the largest physical sector size is reported as the physical sector size for the single disk represented by the RAID array. The operating system can optimize accesses that are aligned with all of the physical sector sizes within the RAID array. Additionally, any storage devices that have a first logical sector that does not have an offset of zero, are configured to ignore all logical sectors in the first physical sector. Accesses to the first logical sector are mapped to the second physical sector. A logical sector alignment of zero is then reported to the operating system for the RAID array, enabling the operating system to avoid unaligned writes.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: November 8, 2011
    Assignee: NVIDIA Corporation
    Inventor: Rakesh Narayan Iyer
  • Patent number: 8054568
    Abstract: Timing based servo bursts of servo frames, in which the frames are arranged to be symmetric with the same number of servo stripes in each burst of a frame, are synchronized by shifting selected bits. For example, servo frames are arranged with four servo bursts with an equal number of servo stripes in each burst, the servo frames comprising two symmetric sub-frames, each sub-frame comprising two bursts of servo stripes that are parallel to each other within a burst, and the bursts are non-parallel with respect to each other; each servo burst is arranged to comprise at least one reference servo stripe; and each servo burst is arranged to comprise at least one shifted servo stripe, wherein the shift is in the same longitudinal direction with respect to at least one reference servo stripe for each burst of a frame and the opposite longitudinal direction for bursts of sequentially adjacent frames.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Giovanni Cherubini, Robert Allen Hutchins, Jens Jelitto, Mark Alfred Lantz
  • Patent number: 8045284
    Abstract: In an implementation, a media drive comprises bit patterned magnetic media and one or more modules. The one or more modules are to cause data to be written on the bit patterned magnetic media in a data sector that includes a synchronization mark disposed between data blocks of the data sector.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: October 25, 2011
    Assignee: Marvell World Trade Ltd.
    Inventor: Xueshi Yang
  • Patent number: 8040629
    Abstract: A method of performing information storage comprises the steps of providing a medium comprising a plurality of concentric rings for storage of information. The medium is written to by a process comprising simultaneously writing and erasing elements in at least two adjacent rings, respectively a first ring and a second ring. Subsequent to simultaneously writing and erasing elements in at least the first and second rings, simultaneously writing and erasing elements in a third concentric ring, wherein the third ring is adjacent the second ring.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: October 18, 2011
    Assignee: Seagate Technology LLC
    Inventor: Kaizhong Gao
  • Patent number: 8035909
    Abstract: A method of writing data on a storage medium that takes into account a condition of the storage medium. The method includes receiving data to be written on a portion of a storage medium and encoding the data based on a condition of the portion of the storage medium. The encoded data is written on the portion of the storage medium. A data storage system that includes a storage medium having defects is also provided. The data storage system utilizes a coding scheme that comprises coding bit patterns configured to address the defects on the storage medium.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: October 11, 2011
    Assignee: Seagate Technology LLC
    Inventor: Alexander V. Kuznetsov
  • Patent number: 8035908
    Abstract: A method of forming a servo track on a recording medium includes; forming a magnetic layer, defining a first servo track region having a plurality of first magnetic segments and a second servo track region having a second plurality of magnetic segments in the magnetic layer, applying a first magnetic field to induce a first magnetization direction in the first and second pluralities of magnetic segments, forming first magnetic patterns, each having a first width, and second magnetic patterns, each having a second width different from the first width, on a first side of a substrate, disposing the substrate on the recording medium, such that the first magnetic patterns are aligned in correspondence with the plurality of first magnetic segments and the second magnetic patterns are aligned in correspondence with the plurality of second magnetic segments, and applying a second magnetic field to the recording medium to selectively induce a second magnetization direction into first selected ones of the first plurali
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: October 11, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Hyun Park, Kwang Jo Jung, Da Woon Chung, Yoon Chul Cho
  • Patent number: 8031427
    Abstract: A method of servo writing for each track of a magnetic recording medium divided into a plurality of circular tracks including performing a phase adjustment operation by controlling a phase of a recording current according to a skew angle formed by a magnetic head and a track of the magnetic recording medium, and writing a servo pattern when the magnetic recording medium is magnetized using a magnetic head so as to have a magnetized pattern corresponding to a servo pattern.
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: October 4, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-su Kim, Jae-chul Shim, Cheol-soon Kim
  • Patent number: 8031423
    Abstract: A disk drive is disclosed comprising a head actuated over a disk having a plurality of data tracks. An ideal data tracks per inch (TPI) profile is determined for the disk, and an actual data TPI profile is generated that estimates the ideal data TPI profile by combining a first segment of a first predetermined data TPI profile and a second segment of a second predetermined data TPI profile.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: October 4, 2011
    Assignee: Western Digital Technologies, Inc.
    Inventors: Chun Sei Tsai, Stephany W. Kwan, Kameron Kam-Wai Jung
  • Patent number: 8027115
    Abstract: A data recording apparatus and a data recording system of the present invention includes buffer memories 2a to 2c that accumulate data in a plurality of channels transferred from an external appliance on a channel basis, a data selector 3 that reads the data accumulated in the buffer memories 2a to 2c, and a data drive 4 that records the data read by the data selector 3 onto a magnetic tape, wherein the data selector 3 selectively reads the data accumulated in the buffer memories 2a to 2c, and outputs the data in an order of recording onto a magnetic tape in the tape drive 4. According to such a configuration, a data recording apparatus that can be realized at low cost and a recording system using the data recording apparatus can be provided.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: September 27, 2011
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Masao Fujita, Kenji Tanaka, Sadamu Kuse
  • Patent number: 8014095
    Abstract: A magnetic disk for a hard disk drive comprising a plurality of physical sector sizes is disclosed. The magnetic disk includes a first sector size area physically formatted according to a first physical sector size and a second sector size area physically formatted according to a second physical sector size different from the first sector size by a multiple of the first sector size wherein the second sector size can be presented externally as multiple sectors of said first sector size.
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: September 6, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands, B.V.
    Inventors: Kirk Hwang, Michael A. Moser, Spencer W. Ng
  • Patent number: 8009377
    Abstract: A tape architecture and a head architecture for a linear tape drive having a reduced actuator stroke is disclosed. In one embodiment, the linear tape drive head assembly includes a top portion having a plurality of write elements and no read elements at a first side and a plurality of read elements and no write elements at a second side opposite of the first side, and a bottom portion laterally offset from the top portion having a plurality of read elements and no write elements at the aforementioned first side and a plurality of write elements and no read elements at the aforementioned second side. The tape is recorded with all the data tracks within each logical band oriented in the same direction.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: August 30, 2011
    Assignee: Quantum Corporation
    Inventor: Lawrence G. Neumann
  • Patent number: 8009376
    Abstract: Embodiments of the present invention help to improve the capacity and the performance of a disk drive device. According to one embodiment, a data track pitch is set to each recording surface. The recording surfaces are divided into bands. A hard disk drive (HDD) sequentially moves a head to an adjacent data track in a band and performs a head switch at the band end in its data accessing. On a recording surface, the number of data tracks in each band is variable; and each band is constituted by different number of data tracks as necessary. The number of data tracks in each band is set so that the radial position of the band end comes close to the radial position of the corresponding band end on another recording surface. Accordingly, even if the recording surfaces have different variation rates of the data track pitch in the radial direction, increase in process time due to head switches can be suppressed.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: August 30, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands, B.V.
    Inventors: Takahiro Saito, Kazunari Tsuchimoto, Atsushi Kanamaru