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    2.
    发明专利
    未知

    公开(公告)号：AT425586T

    公开(公告)日：2009-03-15

    申请号：AT06807120

    申请日：2006-10-10

    Applicant: IBM

    Inventor： SEGER PAUL

    IPC: H03M13/01 ,  G11B20/18

    Abstract: A method, system and program product accurately model the error characteristics of a communications system, such as a tape storage system. Input parameters are entered which describe defect rates and sizes, Codeword Data Structure bytes, and any interleaving factor. Bit defects from simulated defect sources are generated, defined by the starting and ending bits of each defect within a codeword. Any codewords which are defect-free are filtered out and not processed further, thereby increasing the processing speed of the model. Within the defect streams, overlapping defects are merged, redefining defect regions by starting and ending bits. Because only the definitions are processed, not the entire length of the codewords or defects, processing efficiency is further enhanced. The number of defects that occur in each codeword is determined and the probability of the occurrence of N bytes in error per processed codeword may be computed. If desired, a histogram may be generated which includes the rate at which errors occurred and subsequently used to estimate the probability of an error event. Such information may then be incorporated into the design of an error correction code for the modeled system.

    4.
    发明专利
    未知

    公开(公告)号：AT403191T

    公开(公告)日：2008-08-15

    申请号：AT00973077

    申请日：2000-11-08

    Applicant: IBM

    Inventor： SEGER PAUL

    IPC: G06F12/14 ,  G06F21/00 ,  G06F1/00 ,  G06F3/06 ,  G06F3/08 ,  G06F21/24 ,  G06K17/00 ,  G06K19/00 ,  G11B20/10 ,  H04L9/32

    Abstract: A portable security system mounted in a portable data storage cartridge for managing access by users to the cartridge. A programmable computer processor mounted in the cartridge is powered by and transfers data to a data storage drive via a wireless RF interface, when mounted in the drive. A user table has a unique user identifier for each authorized user and lists permitted activities of the user for the cartridge. The user identifier comprises a user symbol and a user decrypting sender public key. An authentication message from the authorized user is encrypted by a sender private key and a receiver public key. The cartridge processor decrypts the message employing a receiver private key and the sender public key, whereby the user authentication message is known to have come from the user and grants access to the user for the listed activities for the cartridge.

    End-to-end data protection supporting multiple CRC algorithms
    6.
    发明专利
    End-to-end data protection supporting multiple CRC algorithms 未知

    公开(公告)号：GB2494042A

    公开(公告)日：2013-02-27

    申请号：GB201214800

    申请日：2012-08-20

    Applicant: IBM

    Inventor： SEGER PAUL ,  BUTT KEVIN DALE

    IPC: G06F11/10 ,  G11B20/18 ,  H03M13/09

    Abstract: End-to-end data protection using a plurality of cyclic-­redundancy-check (CRC) algorithms in which a data block 210 protected by a first CRC 212a is received from a first host device, for example via a data path such as a SAN fabric. The first CRC is generated using a first CRC algorithm. The integrity of the received data block is checked using the first CRC and the first CRC algorithm. A second CRC 212b for the data block is computed using a second CRC algorithm different from the first CRC algorithm. The data block, the first CRC, and the second CRC are stored on a storage medium, such as magnetic tape. A CRC algorithm identifier 500 may be appended to the data written to storage which indicates the CRC algorithm used by the host. When retrieving data blocks from the storage medium the host can specify which of the first or second CRC algorithm to use; the data is read and checked using that algorithm, and optionally the other algorithm, before being returned with the chosen CRC.

    Integrierter Daten- und Kopfdatenschutz für Bandlaufwerke
    7.
    发明专利
    Integrierter Daten- und Kopfdatenschutz für Bandlaufwerke 未知

    公开(公告)号：DE112011100199B4

    公开(公告)日：2016-06-23

    申请号：DE112011100199

    申请日：2011-04-07

    Applicant: IBM

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

    IPC: G11B20/18

    Abstract: Verfahren zum Integrieren von Daten- und Kopfdatenschutz bei Bandlaufwerken, wobei das Verfahren Folgendes umfasst: Bereitstellen einer in Zeilen und Spalten gegliederten Datenanordnung; Berechnen einer Spalten-ECC-Parität (106) für die Spalten; Erweitern der Spalten derart, dass sie die Spalten-ECC-Parität beinhalten; Hinzufügen eines Kopfdatensatzes zu jeder Zeile der Datenanordnung mit den erweiterten Spalten; Berechnen einer Zeilen-ECC-Parität (104) für die kombinierten Zeilen und Kopfdaten; und Erweitern der Zeilen derart, dass sie die Zeilen-ECC-Parität beinhalten;

    8.
    发明专利
    未知

    公开(公告)号：AT557393T

    公开(公告)日：2012-05-15

    申请号：AT09801960

    申请日：2009-12-14

    Applicant: IBM

    Inventor： SEGER PAUL ,  BENTLEY STEVEN

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

    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.

    Determining tape lateral dimensional stability for acceptable write conditions
    9.
    发明专利
    Determining tape lateral dimensional stability for acceptable write conditions 未知

    公开(公告)号：GB2499899A

    公开(公告)日：2013-09-04

    申请号：GB201302854

    申请日：2013-02-19

    Applicant: IBM

    Inventor： HANCOCK REED ALAN ,  SEGER PAUL ,  CHILDERS EDWIN RALPH

    IPC: G11B5/584

    Abstract: A range of acceptable lateral tape expansion and contraction for acceptable write conditions is determined. A tape drive can utilize servo information to determine if the tape has expanded or contracted from the nominal dimension and to determine the magnitude of the expansion or contraction 706. In the case of expansion, the sum 720 of magnitude of the determined expansion and the stored maximum amount of contraction must be below a predetermined threshold value to allow a write 718. In the case of contraction, the sum 710 of magnitude of the determined contraction and the stored magnitude of expansion must be below the same predetermined threshold value to allow a write. If the determined magnitude of contraction or expansion is greater than the stored magnitude of contraction or expansion, respectively, then the new extreme is stored 716, 726. Thus, if a tape cartridge is in an environment in which the tape tends to either contract or expand the acceptable write condition range skews to the contracting or expanding environment.

    Integrierter Daten- und Vorsatzschutz für Bandlaufwerke
    10.
    发明专利
    Integrierter Daten- und Vorsatzschutz für Bandlaufwerke 未知

    公开(公告)号：DE112011100199T5

    公开(公告)日：2012-11-29

    申请号：DE112011100199

    申请日：2011-04-07

    Applicant: IBM

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

    IPC: G11B20/18

    Abstract: Ein Verfahren zum Integrieren von Daten- und Vorsatzschutz bei Bandlaufwerken beinhaltet das Empfangen einer in Zeilen und Spalten gegliederten Datenanordnung. Die Anordnung wird so erweitert, dass sie einen oder mehrere Vorsätze für jede Datenzeile in der Anordnung beinhaltet. Das Verfahren stellt zwei Dimensionen von Fehlerkorrekturcode(ECC)-Schutz für die Daten in der Anordnung und eine einzige Dimension von ECC-Schutz für die Vorsätze in der Anordnung bereit. Eine entsprechende Vorrichtung wird hierin ebenfalls offenbart.

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