公开(公告)号：EP1915758B1

公开(公告)日：2014-03-26

申请号：EP06763850.2

申请日：2006-06-22

Applicant: International Business Machines Corporation

Inventor： SEGER, Paul ,  ELEFTHERIOU, Evangelos ,  JAQUETTE, Glen, Alan ,  CIDECIYAN, Roy, Daron

IPC: G11B20/18

CPC classification number: G11B20/1201 ,  G11B20/18 ,  G11B20/1866 ,  G11B20/20 ,  G11B2020/1282 ,  G11B2020/1284 ,  G11B2220/90

公开(公告)号：EP2153526A1

公开(公告)日：2010-02-17

申请号：EP08736438.6

申请日：2008-04-21

Applicant: International Business Machines Corporation

Inventor： CIDECIYAN, Roy, Daron ,  ELEFTHERIOU, Evangelos ,  MITTELHOLZER, Thomas ,  SEGER, Paul ,  TANAKA, Keisuke

IPC: H03M5/14 ,  G11B20/14

CPC classification number: H03M5/145 ,  G11B20/1426 ,  G11B2020/1446 ,  G11B2020/1473 ,  G11B2220/90 ,  G11B2220/956

Abstract: An unencoded m-bit data input sequence is divided into a block of n bits and a block of m-n bits. The block of n bits is divided into a first set of n+1 encoded bits, wherein at least one of P1subblocks of the first set satisfies a G, M and I constraints. The first set of n+1 encoded bits is mapped into a second set of n+1 encoded bits wherein at least one of P2 subblocks of the second set gives rise to at least Q1 transitions after 1/(1+D2) precoding. A second set of n+1 encoded bits is divided into P3 encoded subblocks and the P3 encoded subblocks are interleaved among (m-n)/s unencoded symbols so as to form a (m+1)-bit output sequence codeword which is then stored on a data storage medium.

Abstract translation: 一个未编码的m位数据输入序列被分成一个n位块和一个m-n位块。 n比特的块被分成第一组n + 1个编码比特，其中第一组的P1subblock中的至少一个满足G，M和I约束。 第一组n + 1编码比特被映射到第二组n + 1编码比特，其中第二组的至少一个P2子块在1 /（1 + D2）预编码之后引起至少Q1转变。 第二组n + 1个编码比特被分成P3个编码子块并且P3个编码子块在（mn）/ s个未编码符号之间交织以形成（m + 1）比特输出序列码字，然后将其存储在 数据存储介质。

公开(公告)号：EP1915758A1

公开(公告)日：2008-04-30

申请号：EP06763850.2

申请日：2006-06-22

Applicant: International Business Machines Corporation

Inventor： SEGER, Paul ,  ELEFTHERIOU, Evangelos ,  JAQUETTE, Glen, Alan ,  CIDECIYAN, Roy, Daron

IPC: G11B20/18

CPC classification number: G11B20/1201 ,  G11B20/18 ,  G11B20/1866 ,  G11B20/20 ,  G11B2020/1282 ,  G11B2020/1284 ,  G11B2220/90

Abstract: A method and apparatus for providing error correction capability to longitudinal position data are disclosed. Initially, data are encoded via a set of even LPOS words and a set of odd LPOS words . The encoded data are then decoded by generating a set of syndrome bits for each of the LPOS words. A determination is then made as to whether or not there is an error within one of the LPOS words based on its corresponding syndrome bits.

公开(公告)号：EP2327075A1

公开(公告)日：2011-06-01

申请号：EP09801952.4

申请日：2009-11-25

Applicant: International Business Machines Corporation

Inventor： MITTELHOLZER, Thomas ,  CIDECIYAN, Roy, Daron ,  ELEFTHERIOU, Evangelos ,  TANAKA, Keisuke ,  MATSUO, Hisato ,  SEGER, Paul

IPC: G11B20/12 ,  G11B20/18 ,  H03M13/27

CPC classification number: G11B20/1833 ,  G11B20/1201 ,  G11B20/1866 ,  G11B2020/1287 ,  G11B2020/1289 ,  G11B2020/1446 ,  G11B2020/1836 ,  G11B2220/93 ,  H03M13/27 ,  H03M13/271

Abstract: For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K
2 rows and K
1 columns. For each unencoded subdata set, N
1 -K
1 C1-parity bytes are generated for each row and N
2 -K
2 C2-parity bytes are generated for each column. The C1 and C2 parity bytes are appended to the ends of the row and column, respectively, to form encoded C1 and C2 codewords, respectively. All of the C1 codewords per data set are endowed with a specific codeword header to form a plurality of partial codeword objects (PCOs). Each PCO is mapped onto a logical data track according to information within the header. On each logical data track, adjacent PCOs arc merged to form COs which are modulation encoded and mapped into synchronized COs. Then T synchronized COs are written simultaneously to the data tape where T is the number of concurrent active tracks on the data tape.

公开(公告)号：EP2260491A1

公开(公告)日：2010-12-15

申请号：EP09711870.7

申请日：2009-02-16

Applicant: International Business Machines Corporation

Inventor： CIDECIYAN, Roy, Daron ,  ELEFTHERIOU, Evangelos ,  SEGER, Paul

IPC: G11B20/12 ,  G11B20/18 ,  G11B5/584 ,  G11B15/46 ,  H03M13/11 ,  G11B20/14

CPC classification number: G11B20/1201 ,  G11B5/584 ,  G11B20/14 ,  G11B20/1833 ,  G11B2020/1281 ,  G11B2020/1284 ,  G11B2020/1287 ,  G11B2020/1484 ,  G11B2220/90 ,  G11B2220/93 ,  G11B2220/95

Abstract: A longitudinal position (LPOS) word L(n) is encoded with error correction capability. The LPOS word includes a plurality of LPOS symbols L0(n) through Lk(n) calculated as (Formula I) and representing a longitudinal position of a magnetic tape relative to a tape head in a tape storage system. A word type is determined in response to at least one of the plurality of LPOS symbols and, in response to the determined word type, at least one formatted symbol F(n) is generated from the plurality of LPOS symbols L(n). At least one parity symbol P(n) is generated from the formatted symbol F(n). The formatted and parity symbols are communicated to a servo channel of the tape storage system to be recorded onto a servo track of the magnetic tape. Adding redundancy to LPOS words provides the capability of correcting multiple bit errors without increasing the LPOS word length.

公开(公告)号：EP2140452A1

公开(公告)日：2010-01-06

申请号：EP08709262.3

申请日：2008-02-29

Applicant: International Business Machines Corporation

Inventor： ELEFTHERIOU, Evangelos ,  HUTCHINS, Robert ,  MITTELHOLZER, Thomas ,  SEGER, Paul

IPC: G11B20/18

CPC classification number: G11B20/1866 ,  G11B20/1426 ,  G11B20/1803 ,  G11B2020/1287 ,  G11B2020/1446 ,  G11B2020/1836 ,  G11B2220/2516 ,  G11B2220/2537 ,  G11B2220/90 ,  H03M5/145 ,  H03M13/1515 ,  H03M13/2707 ,  H03M13/2721 ,  H03M13/275 ,  H03M13/2792 ,  H03M13/2909 ,  H03M13/53 ,  H03M13/6343

Abstract: A system, method and computer program product are provided to encode data for recording onto media whereby modulation and linear constraints from a concatenated code or product code are imposed. A first array of unencoded user data is generated. Each row is modulation encoded to enforce a first modulation constraint; the array is transformed into a second array which is transformed into a third array having predetermined empty locations in each column interleaved with the modulated data. A C2-parity byte is computed for at least some of the empty locations of the third array and a fourth array is generated. C1-parity symbols in each row are computed, generating a fifth array. A second modulation constraint is enforced on each C1-parity symbol in each row of the fifth array, generating a sixth array. The rows of the sixth array are assembled with header and sync fields for recording onto a recording media.

公开(公告)号：EP2153526B1

公开(公告)日：2013-03-20

申请号：EP08736438.6

申请日：2008-04-21

Applicant: International Business Machines Corporation

Inventor： CIDECIYAN, Roy, Daron ,  ELEFTHERIOU, Evangelos ,  MITTELHOLZER, Thomas ,  SEGER, Paul ,  TANAKA, Keisuke

IPC: H03M5/14 ,  G11B20/14

CPC classification number: H03M5/145 ,  G11B20/1426 ,  G11B2020/1446 ,  G11B2020/1473 ,  G11B2220/90 ,  G11B2220/956

公开(公告)号：EP2386107B1

公开(公告)日：2012-05-09

申请号：EP09801960.7

申请日：2009-12-14

Applicant: International Business Machines Corporation

Inventor： SEGER, Paul ,  BENTLEY, Steven, Ross

IPC: G11B20/18 ,  G11B5/008 ,  G11B20/12

CPC classification number: G11B5/00813 ,  G11B20/18 ,  G11B2220/90

Abstract: Writing data to magnetic tape is performed by receiving data from a host, establishing sub data sets, computing C1 and C2 ECC, forming Codeword Quad sets, writing a beginning Data Set Separator to a magnetic tape, writing a plurality of contiguous instances of the CQ Set to the magnetic tape and writing a closing DSS. The number of instances of each Codeword Pair is increased, thereby allowing the benefits of writing short tape records and improving reading reliability while reducing susceptibility to mis-tracking errors and large defects, and while reducing the negative impact on data reliability. Otherwise unused latency times are utilizing and therefore no performance penalty is incurred.

公开(公告)号：EP2168244A1

公开(公告)日：2010-03-31

申请号：EP08785934.4

申请日：2008-07-04

Applicant: International Business Machines Corporation

Inventor： CIDECIYAN, Roy, Daron ,  SEGER, Paul ,  TANAKA, Keisuke

IPC: H03M5/14

CPC classification number: H03M5/145 ,  G11B20/1426 ,  G11B2220/90

Abstract: Method and apparatus are provided for encoding and decoding rate-(s(K+1))/(s(K+1)+1) TCMTR(j,k,t,a) codes, where s is the ECC symbol size in bits and K is the number of unencoded symbols that are interleaved with an (s+1)-bit encoded block at the output of a rate-s/(s+1) encoder that encodes the r-th 5-bit symbol. K=m/s-1 where m=s(K+1) is the total number of bits to be encoded. Error propagation is reduced, thus allowing the ECC code to correct errors efficiently. Header error-rate is also reduced by eliminating occurrence of likely error events at the detector output. Although initially an RLL code may be designed for an ECC symbol size of s bits, the RLL encoding of the present invention may be used in conjunction with ECC schemes that utilize symbol sizes other than s bits.

公开(公告)号：EP2327076B1

公开(公告)日：2018-02-14

申请号：EP09784058.1

申请日：2009-11-17

Applicant: International Business Machines Corporation

Inventor： SEGER, Paul ,  CIDECIYAN, Roy Daron ,  MITTELHOLZER, Thomas ,  TANAKA, Keisuke

IPC: G11B20/18

CPC classification number: G11B20/1883 ,  G11B20/1833 ,  G11B20/1879 ,  G11B2020/183 ,  G11B2020/1836 ,  G11B2220/90

Abstract: During a read-after-write operation on magnetic tape, a first SCO is formed which includes two encoded processed user data units and is one of T SCOs in a first SCO set. The user data units are each one of T user data units in first and second user data unit sets, respectively, within the first SCO set. The first SCO set is written to the magnetic tape and is immediately read. When an error is detected in one of the user data units, a second SCO is formed to include the first user data unit and, only if an error is not detected in a user data unit in the other user data unit set, to not include the other user data unit, the second SCO being one of T SCOs in a second SCO set. Then, the second SCO set is rewritten to a later position on the tape later.