公开(公告)号：AU2021297101A1

公开(公告)日：2022-10-27

申请号：AU2021297101

申请日：2021-06-22

Applicant: IBM

Inventor： BLAUM MARIO ,  HETZLER STEVEN ROBERT

IPC: G06F11/07

Abstract: A data storage system includes a plurality of data blocks. A set of data blocks are protected by an erasure correcting code and each of the data blocks in the set of data blocks includes block identification information. The data storage system includes a processor and logic integrated with the processor, executable by the processor, or integrated with and executable by the processor. The logic is configured to verify the block identification information for each of the data blocks in the set of data blocks at a time of read (1102), and as part of reconstructing a data block, reconstruct the block identification information for the data block and verify the block identification information (1104).

公开(公告)号：GB2502224B

公开(公告)日：2014-02-05

申请号：GB201314853

申请日：2012-02-10

Applicant: IBM

Inventor： HETZLER STEVEN ROBERT ,  BLAUM MARIO ,  HAFNER JAMES LEE

IPC: G06F11/10

公开(公告)号：SG76621A1

公开(公告)日：2000-11-21

申请号：SG1999002740

申请日：1999-06-01

Applicant: IBM

Inventor： SERRANO LOUIS JOSEPH ,  YU MAN-HON MANTLE ,  BLAUM MARIO ,  KABELAC WILLIAM JOHN

IPC: G11B5/012 ,  G11B5/596 ,  G11B5/82 ,  G11B20/18 ,  G11B21/10 ,  G11B27/30 ,  G11B5/58

Abstract: There is disclosed a disk for use in a disk drive and a method for making the disk. The position error signal (PES) fields for each track on the disk are written with predetermined data, e.g. servo data, encoded thereon. In the preferred embodiment: a) the data such as the track number is mapped into codewords of an error correction code (ECC); b) bit-vectors are used to encode the symbols for further redundancy; and c) the raw data written in the PES fields is constrained to equalize the analog signal characteristic used by the servo system for positioning. Thus, the invention allows the PES fields to be used as in the prior art while also being used as a source of digital data which is robustly recorded therein. In one aspect of the invention, the track ID's are written in the PES fields in a selected pattern in which the track ID for each track is recorded in two PES field groups. One of the two PES field groups is centered on the selected track while the other PES field group is offset so that it partially overlaps the adjacent track, as well as the selected track. The PES fields will typically be recorded on the disk at the time of manufacture and not changed thereafter.

公开(公告)号：SG60208A1

公开(公告)日：1999-02-22

申请号：SG1998000437

申请日：1998-02-26

Applicant: IBM

Inventor： BLAUM MARIO ,  HETZLER STEVEN ROBERT ,  KABELAC WILLIAM JOHN

IPC: G11B21/10 ,  G11B5/596 ,  G11B7/007 ,  G11B20/12 ,  G11B20/18 ,  G11B21/08 ,  G11B5/09 ,  G11B5/588

Abstract: A data recording disk drive has a plurality of servo sectors containing error-detectable and error-correctable servo timing marks (STMs). Each STM is represented as a pattern of n bits of digital information, with each track having a set of m unique STM patterns, and wherein each of the m unique STM patterns of n bits has a minimum sliding distance d to every other STM pattern in the set, where d is greater than one. The error-tolerant STMs are achieved by the use of a set or code of fixed STM bit patterns, where the STM patterns have a specified minimum Hamming distance against all the patterns in the search, called the sliding distance d. These STM patterns may include any bits associated with the servo sectors, such as bits indicating track index, servo sector number, and recording head number. The disk drive includes STM decoding circuitry that recognizes valid STMs when the sliding distance between the repeating preamble pattern and the STM patterns are within predetermined limits defined by the power of the code. The disk drive allows a tradeoff between error correction power and error detection power, within the limits defined by the code. The STM decoding circuitry is adaptive by allowing the error correction and error detection comparison values to be updatable.