公开(公告)号：JP2008034088A

公开(公告)日：2008-02-14

申请号：JP2007192165

申请日：2007-07-24

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： CHERUBINI GIOVANNI ,  ELEFTHERIOU EVANGELOS S ,  JENS JELITTO ,  HUTCHINS ROBERT ALLEN

IPC: G11B5/584

CPC classification number: G11B5/59688

Abstract: PROBLEM TO BE SOLVED: To provide a fully synchronous servo channel for a data tape drive. SOLUTION: The fully synchronous servo channel for a data tape drive includes the initial acquisition of synchronous servo channel parameters, generation of a timing basis for signal interpolation, generation of a tape velocity estimate and a y-position estimate, and optimum detection of longitudinal position (LPOS) symbols. COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：为数据磁带驱动器提供完全同步的伺服通道。 解决方案：数据磁带驱动器的完全同步伺服通道包括初始采集同步伺服通道参数，产生信号插补的定时基准，产生磁带速度估计和y位置估计，以及最佳检测 的纵向位置（LPOS）符号。 版权所有（C）2008，JPO＆INPIT

公开(公告)号：GB2484229B

公开(公告)日：2016-09-07

申请号：GB201200295

申请日：2010-06-02

Applicant: IBM

Inventor： JENS JELITTO ,  GIOVANNI CHERUBINI ,  ROBERT ALLEN HUTCHINS ,  MELANIE JEAN SANDBERG

IPC: G11B5/584 ,  G11B5/29

Abstract: A method for monitoring a plurality of servo channels, providing a finite state machine (FSM) comprising a single servo channel mode and a combined servo channel mode, and moving a sequential information storage medium comprising a plurality of servo bands across a read/write head comprising a corresponding plurality of servo sensors. The method further asserts an acquisition flag by a servo channel if that servo channel is tracking a servo pattern, and asserts a bit flag by a servo channel if a new LPOS bit is decoded. If at least one acquisition flag is asserted, the method determines if a bit flag is asserted by a servo channel associated with said asserted acquisition flag, and if an acquisition flag and a bit flag are asserted by a servo channel, the method determines a relative positioning of each servo sensor with respect to an associated servo pattern.

公开(公告)号：GB2529669B8

公开(公告)日：2017-03-15

申请号：GB201415248

申请日：2014-08-28

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  ILIAS ILIADIS ,  JENS JELITTO ,  VINODH VENKATESAN

IPC: G06F3/06

Abstract: A storage system and a method for storing a data segment, a storage capacity manager and a method for managing a capacity of a storage unit, and a storage tier relocation manager and a method for relocating a data segment. The storage system includes at least two storage tiers, an access pattern evaluator, a classification unit, a selector, and logic. The storage capacitor manager includes a monitoring unit and capacity managing unit. The storage tier relocation manager includes a target storage tier, the data segment relocated to the target storage tier, and a protection measure.

公开(公告)号：GB2543898A

公开(公告)日：2017-05-03

申请号：GB201614483

申请日：2016-08-25

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  SIMEON FURRER ,  ROBERT ALLEN HUTCHINS ,  JENS JELITTO

IPC: G11B5/584 ,  G11B20/10

Abstract: A tape drive includes a controller having logic configured to obtain at least two periodic waveform components of a high density (HD) servo signal. The HD signal being read by a servo reader 716 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 702, 704 and 706 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. The logic computes a position error signal 724 (PES) based on the filtered HD servo signal. The HD servo pattern may have three periodic waveforms of a low f1, mid f2 and high frequency f3. Each digital filter may be configured to estimate an energy of a periodic waveform component by the Goertzel algorithm.

公开(公告)号：GB2529669B

公开(公告)日：2016-10-26

申请号：GB201415248

申请日：2014-08-28

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  LLIAS LLIADIS ,  JENS JELITTO ,  VINODH VENKATESAN

IPC: G06F3/06

Abstract: A storage system and a method for storing a data segment, a storage capacity manager and a method for managing a capacity of a storage unit, and a storage tier relocation manager and a method for relocating a data segment. The storage system includes at least two storage tiers, an access pattern evaluator, a classification unit, a selector, and logic. The storage capacitor manager includes a monitoring unit and capacity managing unit. The storage tier relocation manager includes a target storage tier, the data segment relocated to the target storage tier, and a protection measure.

公开(公告)号：GB2488933B

公开(公告)日：2016-08-03

申请号：GB201209688

申请日：2010-12-17

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  JENS JELITTO ,  ANGELIKI PANTAZI

IPC: G11B5/56

公开(公告)号：GB2513492B

公开(公告)日：2018-07-11

申请号：GB201411668

申请日：2012-11-20

Applicant: IBM

Inventor： EVANGELOS STAVROS ELEFTHERIOU ,  ROBERT HAAS ,  NILS HAUSTEIN ,  JENS JELITTO ,  ALEXANDER SAUPP ,  HARALD SEIPP

IPC: G06F3/06 ,  G06F12/08 ,  G06F12/0804 ,  G06F12/0871 ,  G06F12/123

公开(公告)号：GB2543898B

公开(公告)日：2020-03-18

申请号：GB201614483

申请日：2016-08-25

Applicant: IBM

Inventor： GIOVANNI CHERUBINI ,  SIMEON FURRER ,  ROBERT ALLEN HUTCHINS ,  JENS JELITTO

IPC: G11B5/584 ,  G11B20/10

公开(公告)号：GB2487135B

公开(公告)日：2018-05-09

申请号：GB201200428

申请日：2010-09-13

Applicant: IBM

Inventor： ANGELIKI PANTAZI ,  EVANGELOS ELEFTHERIOU ,  JENS JELITTO ,  NHAN XUAN BUI

IPC: G11B5/584

Abstract: Various embodiments for addressing time-varying periodic disturbances in a servo control system are provided. Each of a plurality of coefficients is updated based on an estimation of at least one disturbance frequency. The updated plurality of coefficients is provided to at least one peak filter modifying an input signal of the servo control system. The peak filter is operable in view of the updated plurality of coefficients to cancel at least one of the time-varying periodic disturbances.

公开(公告)号：GB2490828B

公开(公告)日：2017-05-10

申请号：GB201214600

申请日：2011-01-27

Applicant: IBM

Inventor： EVANGELOS STAVROS ELEFTHERIOU ,  WALTER HAEBERLE ,  JENS JELITTO ,  ANGELIKI PANTAZI

IPC: G11B5/584

Abstract: Method for operating a storage device with a tape and a head wherein the head comprises a first and a second read element. Each read element is operable to detect servo-pattern of a particular servo band. The first and the second read element are arranged such that the tape at first passes one of both read elements and subsequently passes the other of both read elements when the tape moves in a predetermined longitudinal direction. A tape transport direction of the tape along the longitudinal direction is determined. The first read element is selected dependent on the determined tape transport direction, when the determined tape transport direction represents a direction where the tape at first passes the first read element and subsequently the second read element. Otherwise the second read element is selected. A position error signal is determined dependent on the selected read element.