公开(公告)号：EP1850342A4

公开(公告)日：2009-04-08

申请号：EP05820131

申请日：2005-12-21

Applicant: IBM

Inventor： MATSUO HISATO ,  FUKUDA JUNICHI

IPC: G11B20/18 ,  G06F13/00 ,  G11B20/10

CPC classification number: G11B20/1803 ,  G11B20/1833 ,  G11B2020/10629 ,  G11B2020/1823 ,  G11B2020/1853 ,  G11B2220/90

Abstract: An information recording device for transferring error-corrected subunits only partially, when the corrected data is returned from error correcting means to an external buffer, and a data-flow control method for the device. The information recording device records the data, in which a correction code is added to user data of plural bytes transferred from a host device, in a recording medium, corrects an error of the data read from the recording medium, with the correction code, and transfers the user data to the host device. The information recording device comprises an external buffer for temporarily storing the data read from the recording medium, error correcting means for correcting the error of the data transferred from the external buffer thereby to create the correction data, and for dividing the corrected data into a plurality of subunits thereby to attach a transfer flag to the subunits containing the corrected data, and data-flow means for transferring only the subunit having the transfer flag attached thereto, to the external buffer when the corrected data is sent from the error correcting means to the external buffer, and for rewriting only the portion of the subunits of the data stored in the external buffer.

公开(公告)号：AT516582T

公开(公告)日：2011-07-15

申请号：AT00303870

申请日：2000-05-09

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B21/10 ,  G11B5/008 ,  G11B5/584 ,  G11B20/10 ,  G11B20/12 ,  G11B27/13

Abstract: Disclosed are a method and a detector for adaptively detecting servo gaps in a timing based servo pattern (50) prerecorded on a variable velocity media. The timing based servo pattern has groups of repeated pairs of non-parallel transition stripes arranged in bursts (52,54,55), the bursts separated by servo gaps whose (70-75) length is variable. A servo system sensor (26) senses the transition stripes in the longitudinal direction of the media. A group interval detector coupled to the sensor detects the timing interval between the same slope transition stripes of two sequential groups of bursts (BX,BY). A divider (170) divides the detected group timing interval by a predetermined divisor to provide a divided timing interval gap detection threshold (181). A sequential stripe interval detector coupled to the sensor measures the timing interval between stripes, and a comparator (110) compares the divided timing interval and the timing interval, identifying a servo gap upon the measured timing interval at least equaling the gap threshold. The detector responds to "valid" signals (BXOK,BYOK) which indicate the validity of the detected group timing interval, repeating operation of the divider to update the gap threshold, and repeating operation of the comparator with the updated gap threshold to continue to identify the servo gaps.

公开(公告)号：HK1032657A1

公开(公告)日：2001-07-27

申请号：HK01101506

申请日：2001-03-01

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAOETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B5/008 ,  G11B5/584 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/13 ,  G11B

Abstract: Disclosed are a method and a detector for adaptively detecting servo gaps in a timing based servo pattern (50) prerecorded on a variable velocity media. The timing based servo pattern has groups of repeated pairs of non-parallel transition stripes arranged in bursts (52,54,55), the bursts separated by servo gaps whose (70-75) length is variable. A servo system sensor (26) senses the transition stripes in the longitudinal direction of the media. A group interval detector coupled to the sensor detects the timing interval between the same slope transition stripes of two sequential groups of bursts (BX,BY). A divider (170) divides the detected group timing interval by a predetermined divisor to provide a divided timing interval gap detection threshold (181). A sequential stripe interval detector coupled to the sensor measures the timing interval between stripes, and a comparator (110) compares the divided timing interval and the timing interval, identifying a servo gap upon the measured timing interval at least equaling the gap threshold. The detector responds to "valid" signals (BXOK,BYOK) which indicate the validity of the detected group timing interval, repeating operation of the divider to update the gap threshold, and repeating operation of the comparator with the updated gap threshold to continue to identify the servo gaps.

公开(公告)号：MY117516A

公开(公告)日：2004-07-31

申请号：MYPI20001979

申请日：2000-05-08

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B5/584 ,  G11B5/008 ,  G11B5/55 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/13

Abstract: DISCLOHSED ARE A METHOD AND A DETECTOR FOR ADAPTIVELY DETECTING SERVO GAPS IN A TIMING BASED SERVO PATTERN PRERECORDED ON A VARIABLE MEDIA.THE TIMING BASED SERVO PATTERN HAS GROUPS OF REPEATED PAIRS OF NON-PARALLEL TRANSITION STRIPES ARRANGED IN BURST, THE BURST SEPARATES BY SERVO GAPS WHOSE LENGTH IS VARIABLE. ASERVO SYSTEM SENSOR SENSE THE TRANSITION STRIPES IN THE LONGITUDINAL DIRECTION OF THE MEDIA. AGROUP INTERVAL DETECTOR COUPLED TO THE SENSOR DETECTS THE TIMING INTERVAL BETWEEN THE SAME SLOPE TRANSITION STRIPES OF TWO SEQUENTIAL GROUPS OF BURST. A DIVIDER DIVIDES THE DETECTED GROUP TIMING INTERVAL BY A PREDETERMINED DIVISOR TO PROVIDE A DIVIDED TIMING INTERVAL GAP DETECTION THRESHOLD .A SEQUENTIAL STRIP INTERVAL DETECTOR COUPLED TO THE SENSOR MEASURES THE TIMING INTERVAL BETWEEN STRIPES, AND A COMPARATOR COMPARES THE DIVIDED TIMING INTERVAL AND THE TIMING INTERVAL, IDENTIFYING A SERVO GAP UPON THE MEASURED TIMING INTERVAL AT LEAST EQUALING THE GAP THRESHOLD. THE DETECTOR RESPONDS TO "VALID" SIGNALS WHICH INDICATE THE VALIDITY OF THE DETECTED GROUP TIMING INTERVAL, REPEATION OPERATION OF THE DIVIDER TO UPDATE THE GAP THRESHOLD , REPEATING OPERATION OF THE COMPARATOR WITH THE UPDATED GAP THRESHOLD TO CONTINUE TO IDENTIFY THE SERVO GAPS.

公开(公告)号：JP2006048854A

公开(公告)日：2006-02-16

申请号：JP2004230667

申请日：2004-08-06

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： XUAN BUI NHAN ,  JAMES HOWARD EATON ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  OGURA EIJI ,  ALLAN TAYLOR MARK ,  TSURUTA KAZUHIRO

IPC: G11B5/584 ,  G11B20/10 ,  G11B20/12

Abstract: PROBLEM TO BE SOLVED: To make a pattern of a separated servo band have at least one distinguishing property for a pattern of the other separated servo band in a tape having the separated servo band of a pattern arranged in the horizontal direction over the whole tape. SOLUTION: The distinguishing property enables the identification of the separated servo band. For example, a pattern of the separated servo band has the detectable transition of a different azimuth orientation such as inversion in the horizontal direction for the other servo band. In the other method, a variation quantity in the width of a gap of a pattern is given to the other servo band. In the other method, a variation quantity in the number of the detectable transition of the pattern is given to the pattern of the other servo band. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：为了使分离的伺服带的图案在具有在水平方向上布置的图案的分离的伺服带的带中的另一个分离的伺服带的图案上具有至少一个区别特性， 整卷

解决方案：区分特性使得能够识别分离的伺服带。 例如，分离的伺服带的图案具有不同方位取向的可检测转变，例如在另一个伺服带的水平方向上的反转。 在另一种方法中，对另一个伺服带给出了图案间隙宽度的变化量。 在另一种方法中，将图案的可检测转变次数的变化量给予另一个伺服带的图案。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2001067847A

公开(公告)日：2001-03-16

申请号：JP2000215615

申请日：2000-07-17

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B27/10 ,  G11B5/584 ,  G11B5/592 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To obtain a data detection method and a data detection apparatus for performing robust detection of data modulated into a servo pattern of a timing base. SOLUTION: First, a timing interval between sequential change stripes is detected, and then, an interval comparison logic circuit 112 determines whether '0' or '1' is represented. Thereafter, a first counter 106 increments the number of the compared intervals that represent '0', while a second counter 107 increments the number of the compared intervals that represent '1'. Then, a bit comparison logic circuit 123 compares the incremented number with a predefined reference value 122 for every frame. When either one is fitted to the reference value 122, the corresponding '0' or '1' is identified as a bit value for the frame.

公开(公告)号：JP2006048852A

公开(公告)日：2006-02-16

申请号：JP2004230471

申请日：2004-08-06

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： XUAN BUI NHAN ,  JAMES HOWARD EATON ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  OGURA EIJI ,  ALLAN TAYLOR MARK ,  TSURUTA KAZUHIRO

IPC: G11B5/584 ,  G11B20/10 ,  G11B20/12

Abstract: PROBLEM TO BE SOLVED: To provide selected and different superimpose data information to identify a separated servo band for addressablility in which the separated servo band is independent in a magnetic tape having a vertical direction servo band in which servo information provided with superimpose data information is separated. SOLUTION: Servo information has transition extended in the horizontal direction not parallel to indicate the positioning of a horizontal direction, The selected different superimpose data information can have a lack of a part of the servo band. When the superimpose data information is the position information of a vertical direction, The selected different superimpose data information can have position information in which one or a plurality of servo bands are different. The selected different superimpose data information can have a band identifier in the superimpose data information of one or the plurality of servo bands. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：为了提供选择和不同的叠加数据信息以识别在具有垂直方向伺服频带的磁带中分离的伺服频带独立的可分辨的伺服频带，其中提供有叠加数据的伺服信息 信息是分开的。

解决方案：伺服信息在水平方向上的转换不平行，以指示水平方向的定位。所选择的不同叠加数据信息可能缺少伺服带的一部分。 当叠加数据信息是垂直方向的位置信息时，所选择的不同叠加数据信息可以具有其中一个或多个伺服带不同的位置信息。 所选择的不同叠加数据信息可以在一个或多个伺服带的叠加数据信息中具有频带标识符。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2001006140A

公开(公告)日：2001-01-12

申请号：JP2000139485

申请日：2000-05-12

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B5/008 ,  G11B5/584 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/13

Abstract: PROBLEM TO BE SOLVED: To effectively and precisely identify the serve gap by dividing a detected group timing gap by a specified divisor, feeding a timing interval gap detection threshold, and measuring the timing intervals between detected transition stripes. SOLUTION: A divider 170 divides a detected group B timing interval by a specified divisor to output a divided timing interval gap detection threshold. The divisor is selected by a divisor selector 174 to generate longer thresholds than the timing interval between transition stripes of burst one by one, and this involves values for generating shorter thresholds than the timing intervals of a min. interval gap at the edge of a servo pattern. A servo gap output value of a comparator 110 is fed back to an interval counter 120, and the count is fixed to latch the detection. When a pulse detector 122 detects the next stripe transition, the interval counter is reset to zero again.