公开(公告)号：US20180277155A1

公开(公告)日：2018-09-27

申请号：US15994784

申请日：2018-05-31

Applicant: International Business Machines Corporation

Inventor： Robert A. Hutchins

IPC: G11B20/10 ,  G11B5/02 ,  G11B5/008

Abstract: A computer program product, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a processing circuit to cause the processing circuit to perform a method that includes reading data from a magnetic data storage medium. The processing circuit uses a tracking threshold module to detect and track positive peak amplitudes and negative peak amplitudes of a readback waveform during the data reading. Asymmetry compensation is performed on the data based on input from the tracking threshold module. The asymmetry compensation does not rely on an input except from the tracking threshold module in order to perform the asymmetry compensation.

公开(公告)号：US10055289B2

公开(公告)日：2018-08-21

申请号：US15154725

申请日：2016-05-13

Applicant: International Business Machines Corporation

Inventor： Roy D. Cideciyan ,  Simeon Furrer ,  Robert A. Hutchins ,  Keisuke Tanaka

IPC: G11B5/09 ,  G06F11/10 ,  G11B20/18 ,  G06F3/06 ,  G11B5/008

CPC classification number: G06F11/1076 ,  G06F3/0619 ,  G06F3/064 ,  G06F3/0682 ,  G11B5/00817 ,  G11B20/1833

Abstract: In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to cause data to be written to a first write section of a magnetic medium as a plurality of first codeword sets, and cause at least some of the data to be written to a rewrite section of the magnetic medium as one or more rewritten codeword sets. A length of at least one rewritten row stored to the rewrite section of the magnetic medium is greater than either a length of another rewritten row in the same rewritten codeword set and/or a length of at least one row in a codeword set stored to the first write section of the magnetic medium.

公开(公告)号：US20170323662A1

公开(公告)日：2017-11-09

申请号：US15656939

申请日：2017-07-21

Applicant: International Business Machines Corporation

Inventor： Robert A. Hutchins

IPC: G11B20/10 ,  G11B5/02 ,  G11B5/008

CPC classification number: G11B20/10324 ,  G11B5/00813 ,  G11B5/02 ,  G11B20/10009 ,  G11B20/10018 ,  G11B20/10027 ,  G11B20/10046 ,  G11B20/10055

Abstract: In one embodiment, a system includes one or more processors and logic integrated with and/or executable by the one or more processors. The logic is configured to cause at least one of the processors to detect positive peak amplitudes and negative peak amplitudes of an unequalized readback signal that exhibits imperfect or bi-modal waveform peaks using a peak tracking threshold module positioned at an input to an equalizer. Also, the logic is configured to cause the at least one of the processors to track the positive peak amplitudes and the negative peak amplitudes of the unequalized readback signal in a record. Moreover, the logic is configured to cause the at least one of the processors to provide, as an input to an asymmetry compensator, the record of the peak amplitudes and the negative peak amplitudes determined from the unequalized readback signal.

公开(公告)号：US09673839B2

公开(公告)日：2017-06-06

申请号：US15012529

申请日：2016-02-01

Applicant: International Business Machines Corporation

Inventor： Roy D. Cideciyan ,  Simeon Furrer ,  Robert A. Hutchins

IPC: H03M13/00 ,  H03M13/29 ,  H04L1/00 ,  G06F11/00 ,  H03M13/11 ,  H03M13/15

CPC classification number: H03M13/2909 ,  G06F11/00 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/2927 ,  H03M13/293 ,  H03M13/2948 ,  H03M13/2951 ,  H03M13/2975 ,  H04L1/0051

Abstract: In one embodiment, a method for decoding data includes iteratively C1 decoding all first subsets of a set of data two or more times in each half iteration using two or more C1-decoding methods when a first subset is not decoded successfully using a first C1 decoding, determining whether to stop decoding the set of data after the C1 decoding and output results of the C1 decoding, incrementing a half iteration counter to indicate completion of a half iteration in response to decoding not being stopped, C2 decoding all second subsets of the set of data, determining whether to stop decoding the set of data after the C2 decoding and output results of the C2 decoding, incrementing the half iteration counter to indicate completion of another half iteration in response to decoding not being stopped, and outputting decoded data when all subsets of the set of data are decoded successfully.

公开(公告)号：US09666225B2

公开(公告)日：2017-05-30

申请号：US14923389

申请日：2015-10-26

Applicant: International Business Machines Corporation

Inventor： Roy D. Cideciyan ,  Simeon Furrer ,  Robert A. Hutchins ,  Mark A. Lantz ,  Keisuke Tanaka

IPC: G11B20/10

CPC classification number: G11B20/10009 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/10916

Abstract: In one embodiment, a system includes a data processing unit configured to read encoded data from a magnetic tape medium. The data processing unit is also configured to decode a plurality of codeword interleaves (CWIs) from the encoded data, each CWI being a row in a sub data set logically organized into a two-dimensional array. The array includes a predetermined number of rows and columns of predetermined lengths. The data processing unit is also configured to determine an address for a first-written CWI without successfully decoding a corresponding codeword interleave designation (CWID) from the encoded data, each CWID specifying an address for a corresponding CWI. Also, each CWID is calculated as a function of a logical track number and a CWI set number.

公开(公告)号：US09659593B2

公开(公告)日：2017-05-23

申请号：US14957533

申请日：2015-12-02

Applicant: International Business Machines Corporation

Inventor： Katherine T. Blinick ,  Robert A. Hutchins ,  Sedat Oelcer

IPC: G11B5/09 ,  G11B20/10 ,  G11B5/035 ,  G11B5/008

CPC classification number: G11B20/10055 ,  G11B5/00813 ,  G11B5/00878 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10037 ,  G11B20/10046

Abstract: According to one embodiment, a method for processing data includes directing first data through a first FIR gain module in response to a determination that the first data is being read from a magnetic tape medium in an asynchronous mode to control FIR gain of the first data. The method also includes directing second data through a second FIR gain module in response to a determination that the second data is being read from the magnetic tape medium in a synchronous mode to control FIR gain of the second data. Other systems and methods for processing data using dynamic gain control with adaptive equalizers are presented according to more embodiments.

公开(公告)号：US20170117015A1

公开(公告)日：2017-04-27

申请号：US15399570

申请日：2017-01-05

Applicant: International Business Machines Corporation

Inventor： Giovanni Cherubini ,  Simeon Furrer ,  Robert A. Hutchins ,  Jens Jelitto

IPC: G11B20/10 ,  G11B20/18 ,  G11B5/008 ,  G11B5/592

CPC classification number: G11B20/10231 ,  G11B5/00813 ,  G11B5/584 ,  G11B5/5926 ,  G11B5/59666 ,  G11B5/59688 ,  G11B20/10388 ,  G11B20/18

Abstract: In one general embodiment, a method includes determining a sampling interval for an interpolator using at least one parameter. The method further includes applying the sampling interval to the interpolator in response to determining the sampling interval. In another general embodiment, an apparatus includes an interpolator and a controller. The controller is configured to determine a sampling interval for the interpolator using at least one parameter. The controller is also configured to apply the sampling interval to the interpolator in response to determining the sampling interval.

公开(公告)号：US09542265B2

公开(公告)日：2017-01-10

申请号：US14477647

申请日：2014-09-04

Applicant: International Business Machines Corporation

Inventor： Roy D. Cideciyan ,  Robert A. Hutchins ,  Thomas Mittelholzer ,  Keisuke Tanaka

IPC: G06F11/10 ,  H04L1/00 ,  H03M13/29 ,  G11B7/007 ,  G11B20/18 ,  H03M13/03 ,  H03M13/35 ,  H03M13/37 ,  H03M13/09 ,  H03M13/11 ,  H03M13/15

CPC classification number: G06F11/1012 ,  G11B7/007 ,  G11B20/1809 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1836 ,  H03M13/03 ,  H03M13/09 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/2909 ,  H03M13/2924 ,  H03M13/293 ,  H03M13/356 ,  H03M13/373 ,  H03M13/3746 ,  H04L1/0061

Abstract: A method for decoding a headerized sub data set (SDS) according to one embodiment includes decoding a header from a headerized SDS to obtain a SDS. C1 and C2 decoding are performed on the SDS in a number of iterations based on a number of interleaves in each row of the SDS. A number of columns of the SDS are overwritten with successfully decoded C2 codewords. A number of rows of the SDS are overwritten with successfully decoded C1 codewords. A number of C1 and/or C2 codewords of the SDS are erased. Remaining rows and/or columns of the SDS are maintained as uncorrected. The SDS is output when all rows of the SDS include only C1 codewords and all columns of the SDS include only C2 codewords.

Abstract translation: 根据一个实施例的用于对标题化子数据集（SDS）进行解码的方法包括从标题化的SDS解码报头以获得SDS。 基于SDS的每行中的交织数量，在SDS上执行C1和C2解码。 SDS的许多列被成功解码的C2码字覆盖。 SDS的许多行被成功解码的C1码字覆盖。 SDS的多个C1和/或C2码字被擦除。 SDS的剩余行和/或列保持为未校正。 当SDS的所有行仅包含C1码字时，输出SDS，SDS的所有列仅包括C2码字。

公开(公告)号：US09524741B1

公开(公告)日：2016-12-20

申请号：US14929227

申请日：2015-10-30

Applicant: International Business Machines Corporation

Inventor： Giovanni Cherubini ,  Simeon Furrer ,  Robert A. Hutchins ,  Jens Jelitto

IPC: G11B5/584 ,  G11B5/008 ,  G11B5/09 ,  G11B20/10 ,  G11B20/18

CPC classification number: G11B5/584 ,  G11B5/00813 ,  G11B5/00826 ,  G11B5/09 ,  G11B20/10046

Abstract: In one embodiment, a tape drive includes a controller including a processor and logic integrated with and/or executable by the processor. The logic is configured to obtain at least two periodic waveform components of a high density (HD) servo signal read by a servo reader from a HD pattern written on a servo band of a magnetic tape medium. The logic is also configured to filter the HD servo signal using a number of digital filters that are configurable to detect waveform components simultaneously read from the magnetic tape medium, each digital filter being configured to match waveform component parameters and tape velocity. Moreover, the logic is configured to compute a position error signal (PES) based on the filtering of the HD servo signal comprising the waveform components.

Abstract translation: 在一个实施例中，磁带驱动器包括控制器，其包括处理器和与处理器集成和/或可执行的逻辑。 逻辑被配置为从写入磁带介质的伺服带上的HD模式获得伺服读取器读取的高密度（HD）伺服信号的至少两个周期波形分量。 该逻辑还被配置为使用多个数字滤波器来过滤HD伺服信号，数字滤波器可配置为检测从磁带介质同时读取的波形分量，每个数字滤波器被配置为匹配波形分量参数和磁带速度。 此外，逻辑被配置为基于包括波形分量的HD伺服信号的滤波来计算位置误差信号（PES）。

公开(公告)号：US20160292034A1

公开(公告)日：2016-10-06

申请号：US15154794

申请日：2016-05-13

Applicant: International Business Machines Corporation

Inventor： Roy D. Cideciyan ,  Simeon Furrer ,  Robert A. Hutchins ,  Keisuke Tanaka

IPC: G06F11/10 ,  G06F3/06

CPC classification number: G06F11/1076 ,  G06F3/0619 ,  G06F3/064 ,  G06F3/0682 ,  G11B5/00817 ,  G11B20/1833

Abstract: In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to read data stored as a plurality of first codeword sets on a first write section of a magnetic medium. The logic is also configured to read at least some of the data stored as one or more rewritten codeword sets on a rewrite section of the magnetic medium. A length of at least one rewritten row stored to the rewrite section of the magnetic medium is greater than: a length of another rewritten row in the same rewritten codeword set, and/or a length of at least one row in a codeword set stored to the first write section of the magnetic medium.

Abstract translation: 在一个实施例中，系统包括与控制器集成和/或可执行的控制器和逻辑。 逻辑被配置为读取在磁介质的第一写入部分上存储为多个第一码字集合的数据。 逻辑还被配置为读取在磁介质的重写部分上存储为一个或多个重写的码字集合的至少一些数据。 存储到磁介质的重写部分中的至少一个重写行的长度大于：在相同重写的码字集合中的另一个重写行的长度和/或存储到 磁介质的第一个写入区。