公开(公告)号：GB2583040A

公开(公告)日：2020-10-14

申请号：GB202009787

申请日：2018-12-04

Applicant: IBM

Inventor： ROY CIDECIYAN ,  SIMEON FURRER ,  MARK ALFRED LANTZ

IPC: G11B20/12 ,  G11B20/18

Abstract: A method includes writing a data set to a sequential access medium. The method also includes reading the data set immediately after being written to the sequential access medium in a read-while-write process to identify one or more faulty encoded data blocks, each of the one or more faulty encoded data blocks including at least one faulty codeword having symbols at least 10 bits in size. Moreover, the method includes rewriting a first of the one or more faulty encoded data blocks within a first encoded data block set to a particular logical track in the rewrite area of the sequential access medium selected from a predetermined subset of logical tracks. The predetermined subset of logical tracks includes D1+D2+1 logical tracks. Only one faulty encoded data block from a particular sub data set is rewritten in a single encoded data block set in the rewrite area.

公开(公告)号：GB2583040B

公开(公告)日：2021-06-23

申请号：GB202009787

申请日：2018-12-04

Applicant: IBM

Inventor： ROY CIDECIYAN ,  SIMEON FURRER ,  MARK ALFRED LANTZ

IPC: G11B20/12 ,  G11B20/18

Abstract: In one embodiment, a method includes writing a data set to a sequential access medium. The method also includes reading the data set after being written in a read-while-write process to identify faulty encoded data blocks, each of the faulty encoded data blocks including at least one faulty codeword. Moreover, the method includes rewriting a correct version of a first of the encoded data blocks in a first encoded data block set to the rewrite area of the sequential access medium selected from a predetermined subset of logical tracks. The predetermined subset of logical tracks includes D1+D2+1 logical tracks. Only one encoded data block from a particular sub data set is rewritten in a single encoded data block set in the rewrite area.

公开(公告)号：GB2490831B

公开(公告)日：2018-12-12

申请号：GB201214869

申请日：2011-04-07

Applicant: IBM

Inventor： ROY CIDECIYAN ,  HISATO MATSUO ,  THOMAS MITTELHOLZER ,  KENJI OHTANI ,  PAUL SEGER ,  KEISUKE TANAKA

IPC: G11B20/18

公开(公告)号：GB2576666A

公开(公告)日：2020-02-26

申请号：GB201917258

申请日：2018-05-30

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  ROY CIDECIYAN ,  SIMEON FURRER ,  MARCEL KOSSEL ,  HAZAR YÜKSEL

IPC: H04L1/00 ,  H03M13/41 ,  H04L25/03

Abstract: Calculating path metrics, associated with respective states of an n-state trellis, by accumulating branch metrics in a sequence detector. Each path metric is represented by N bits plus a wrap-around bit for indicating wrap-around of the N-bit value of that path metric.

公开(公告)号：GB2576666B

公开(公告)日：2022-03-16

申请号：GB201917258

申请日：2018-05-30

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  ROY CIDECIYAN ,  SIMEON FURRER ,  MARCEL KOSSEL ,  HAZAR YÜKSEL

IPC: H03M13/41 ,  H03M13/39 ,  H04L1/00 ,  H04L25/03

Abstract: Calculating path metrics, associated with respective states of an n-state trellis, by accumulating branch metrics in a sequence detector. Each path metric is represented by N bits plus a wrap-around bit for indicating wrap-around of the N-bit value of that path metric.