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    ROGUE PACKET DETECTION AND CORRECTION METHOD FOR DATA STORAGE DEVICE
    1.
    发明公开
    ROGUE PACKET DETECTION AND CORRECTION METHOD FOR DATA STORAGE DEVICE 有权
    流氓包检测和校正方法的数据存储设备

    公开(公告)号：EP1232499A1

    公开(公告)日：2002-08-21

    申请号：EP99962794.6

    申请日：1999-11-17

    申请人： Ecrix Corporation

    发明人： MCAULIFFE, Richard H.

    IPC分类号： G11B20/18 ,  H03M13/29

    CPC分类号： H03M13/09 ,  G11B20/18 ,  H03M13/151 ,  H03M13/1515 ,  H03M13/29 ,  H03M13/2909 ,  H03M13/2918 ,  H03M13/2921 ,  H03M13/293 ,  H03M13/31

    摘要： A method for detecting the location of falsely detected 'good' data, or 'rogue', packets in a data buffer (10) is presented. A segemnt-level CRC is generated (14, 614) over, and associated with, a buffer segment (11), and recorded along with the segment data (15) onto a storage medium. During data recovey, only packets (5) that pass a packet-level error detection test are allowed in the data buffer (10). Once a data segment (11) is complete, a segment-level CRC test (14) is performed over the recovered segment-level CRC and the entire recovered segment data. The segment (11) contains a rogue packet if the segment-level CRC test fails. Reed-Solomon syndromes are generated and used to locate and optionally correct the rogue packets.

    VARIABLE SPEED RECORDING METHOD AND APPARATUS FOR A MAGNETIC TAPE DRIVE
    4.
    发明公开
    VARIABLE SPEED RECORDING METHOD AND APPARATUS FOR A MAGNETIC TAPE DRIVE 有权
    用于磁带驱动器的变速记录方法和设备

    公开(公告)号：EP1145235A2

    公开(公告)日：2001-10-17

    申请号：EP99955108.8

    申请日：1999-10-20

    申请人： Ecrix Corporation

    发明人： BEAVERS, Kelly, J. ,  BLATCHLEY, Michael, A. ,  DETRO, David, L. ,  TURNER, Christopher, J. ,  ZACZEK, Thomas, E.

    IPC分类号： G11B15/18 ,  G11B15/467 ,  G11B15/43 ,  G11B5/008 ,  G11B15/04 ,  G11B15/06

    CPC分类号： G11B5/0086 ,  G11B5/00878 ,  G11B15/04 ,  G11B15/06 ,  G11B15/093 ,  G11B15/1875 ,  G11B15/43 ,  G11B15/4673

    摘要： A method and apparatus for varying track recording speed to maximize host-to-tape data transfer rates is presented. Variable data transfer rates of host systems and networks are accommodated by continually adjusting the tape speed to match the tape drive to the host's actual transfer rate. The speed of the tape is adjusted according to both the level of data present in the tape drive data buffer and whether the current mode of the drive is write mode or read mode. In the preferred embodiment, when the tape speed is accelerated or decelerated while writing a number of data track pairs to tape, a predetermined number of dummy track pairs are first written to tape at the current speed. On the next write head phase after the speed is increased or decreased as appropriate while the read heads are over the track, a predetermined number of dummy track pairs followed by more data track pairs are written to the tape at the new speed.

    摘要翻译： 提出了一种用于改变轨道记录速度以使主机到磁带数据传输速率最大化的方法和设备。 主机系统和网络的可变数据传输速率可以通过不断调整磁带速度来适应磁带机与主机的实际传输速率相适应。 根据磁带驱动器数据缓冲区中存在的数据级别以及驱动器的当前模式是写入模式还是读取模式来调整磁带的速度。 在优选实施例中，当磁带速度在将多个数据磁道对写入磁带的同时加速或减速时，预定数目的虚拟磁道对首先以当前速度写入磁带。 在读磁头位于磁道上方时，在适当增加或减小速度之后的下一个写磁头相位上，以新速度将预定数量的伪磁道对跟随着更多数据磁道对写入磁带。

    OVERSCAN HELICAL SCAN HEAD FOR NON-TRACKING TAPE SUBSYSTEMS READING AT UP TO 1X SPEED AND APPARATUS FOR SIMULATION OF SAME
    6.
    发明授权
    OVERSCAN HELICAL SCAN HEAD FOR NON-TRACKING TAPE SUBSYSTEMS READING AT UP TO 1X SPEED AND APPARATUS FOR SIMULATION OF SAME 有权
    对于NICHTSPURGEFOLGENDE BAND过扫描螺旋扫描头装置 - 子系​​统，它们加快速度更容易阅读和设备进行仿真DESSELBIGEN

    公开(公告)号：EP1127350B1

    公开(公告)日：2002-09-18

    申请号：EP99961524.8

    申请日：1999-10-20

    申请人： Ecrix Corporation

    发明人： BEAVERS, Kelly, J. ,  BLATCHLEY, Michael, A. ,  DETRO, David, L. ,  DUNN, Paul

    IPC分类号： G11B5/53

    CPC分类号： G11B33/10 ,  G11B5/0086 ,  G11B5/534 ,  G11B15/1808 ,  G11B21/04

    摘要： A helical scan drum design for use in non-tracking tape devices which assures 70% coverage of a track to be read by overscanning with at least two read heads at approximate 1X speed. The present invention further provides a simulation method for evaluating potential drum designs for such overscan applications. The preferred drum design uses pairs of like-azimuth read heads positioned on the rotating drum such that in combination they overlap the scan of a track by 130% the track width. These dimensions assure at least 70% coverage of each track by at least one of the pair of heads at up to 1X speed while assuring no overlap with another like-azimuth recorded track. The simulation method allows for evaluation of potential drum designs by accepting parameters describing the intended drum application and then simulating track read operations over a plurality of simulated tracks to determine the efficacy of the design over a range of tape speeds and gap widths. Designs that simulate successful reading of a sufficient threshold number of tracks over a sufficiently broad range of tape speeds may then be selected for further test and evaluation.

    METHOD AND APPARATUS FOR LOGICALLY REJECTING PREVIOUSLY RECORDED TRACK RESIDUE FROM MAGNETIC MEDIA
    7.
    发明公开
    METHOD AND APPARATUS FOR LOGICALLY REJECTING PREVIOUSLY RECORDED TRACK RESIDUE FROM MAGNETIC MEDIA 有权
    方法和装置已记录磁道废磁介质的逻辑抑制

    公开(公告)号：EP1131822A2

    公开(公告)日：2001-09-12

    申请号：EP99960453.1

    申请日：1999-11-16

    申请人： Ecrix Corporation

    发明人： MCAULIFFE, Richard H. ,  ZACZEK, Thomas E.

    IPC分类号： G11B20/10 ,  G11B20/18 ,  G11B27/30 ,  G11B27/10

    CPC分类号： G11B20/10 ,  G11B15/026 ,  G11B20/1833 ,  G11B27/107 ,  G11B27/3027 ,  G11B2220/90

    摘要： A method for logically rejecting previously recorded track residue from magnetic media is presented. A session ID (52) unique to a given recording session is encoded into track packet error check (16) and error correction codes (18) but is not itself actually written to tape. During a data recovery session, a reference session ID (78) for the original recording session is acquired by reconstructing the packet session ID (52) from the first few track packets and verifying that a predetermined number of consecutive track packets (8) have identical packet session IDs (52). Once the reference packet session ID (78) is acquired, it is preloaded into error detection (82) and correction (84) hardware. When a residue track encoded with a previously recorded session ID is recovered by the tape drive track packet detection circuitry, it is inherently rejected because the error detection and correction hardware detects an error and it is therefore never allowed into the data buffer.

    OVERSCAN HELICAL SCAN HEAD FOR NON-TRACKING TAPE SUBSYSTEMS READING AT UP TO 1X SPEED AND METHODS FOR SIMULATION OF SAME
    8.
    发明公开
    OVERSCAN HELICAL SCAN HEAD FOR NON-TRACKING TAPE SUBSYSTEMS READING AT UP TO 1X SPEED AND METHODS FOR SIMULATION OF SAME 有权
    过扫描螺旋扫描头装置NICHTSPURGEFOLGENDE BAND - 子系​​统，它们简单的速读和方法进行仿真DESSELBIGEN

    公开(公告)号：EP1127350A2

    公开(公告)日：2001-08-29

    申请号：EP99961524.8

    申请日：1999-10-20

    申请人： Ecrix Corporation

    发明人： BEAVERS, Kelly, J. ,  BLATCHLEY, Michael, A. ,  DETRO, David, L. ,  DUNN, Paul

    IPC分类号： G11B5/53

    CPC分类号： G11B33/10 ,  G11B5/0086 ,  G11B5/534 ,  G11B15/1808 ,  G11B21/04

    摘要： A helical scan drum design for use in non-tracking tape devices which assures 70% coverage of a track to be read by overscanning with at least two read heads at approximate 1X speed. The present invention further provides a simulation method for evaluating potential drum designs for such overscan applications. The preferred drum design uses pairs of like-azimuth read heads positioned on the rotating drum such that in combination they overlap the scan of a track by 130% the track width. These dimensions assure at least 70% coverage of each track by at least one of the pair of heads at up to 1X speed while assuring no overlap with another like-azimuth recorded track. The simulation method allows for evaluation of potential drum designs by accepting parameters describing the intended drum application and then simulating track read operations over a plurality of simulated tracks to determine the efficacy of the design over a range of tape speeds and gap widths. Designs that simulate successful reading of a sufficient threshold number of tracks over a sufficiently broad range of tape speeds may then be selected for further test and evaluation.

    A METHOD OF REACQUIRING CLOCK SYNCHRONIZATION ON A NON-TRACKING HELICAL SCAN TAPE DEVICE
    10.
    发明公开
    A METHOD OF REACQUIRING CLOCK SYNCHRONIZATION ON A NON-TRACKING HELICAL SCAN TAPE DEVICE 有权
    方法恢复从上的时钟同步轨道地段倾斜磁道磁带驱动器

    公开(公告)号：EP1131823A2

    公开(公告)日：2001-09-12

    申请号：EP99961684.0

    申请日：1999-11-16

    申请人： Ecrix Corporation

    发明人： BLATCHLEY, Michael, A. ,  MCAULIFFE, Richard, H.

    IPC分类号： G11B20/18 ,  G11B20/14

    CPC分类号： G11B20/1403 ,  G11B20/18

    摘要： A method and apparatus for reacquiring synchronization of a clock synchronization signal (58) with a data signal (60) in a non-tracking storage device is presented. A packet error detector (46) detects errors in data packets (55) from a data signal (60) and generates a packet error status (56) for each reconstructed packet (55). A read quality detector (42) monitors the packet error status (56) and determines whether the quality of the data signal (60) is of an acceptable versus unacceptable read quality condition. The read quality condition is based on the number of consecutive packets in which an error is detected. Upon detection of an unacceptable read quality condition, the read channel is disabled and the clock synchronize signal (58) is relocked to a known reference frequency (54). The read channel is then reenabled and the clock synchronization signal (58) is relocked to the data signal (60).