公开(公告)号：GB2500693A

公开(公告)日：2013-10-02

申请号：GB201205685

申请日：2012-03-30

Applicant: IBM

Inventor： PANTAZI ANGELIKI ,  LANTZ MARK ALFRED

IPC: G11B5/55 ,  G11B21/02

Abstract: Tracking control in a data storage device 1 is adapted to counter effects of vibration. The storage device has a device body 2 and a read/write head 6 for reading and writing data in a data track of a storage medium 5. An actuator system 7 has a plurality of degrees of freedom and is mounted on the device body for moving the read/write head relative to the data track. A body vibration sensor, such as an accelerometer 8, is provided on the device body for generating a signal indicative of vibration of the body and an actuator vibration sensor 9 is provided on the actuator system for generating a signal indicative of vibration of the actuator system. A controller processes the signals from the body and actuator vibration sensors to derive at least one coupling signal indicative of vibration coupling between the degrees of freedom, and controls the actuator system in dependence on the coupling signal and the signal from the body vibration sensor. The controller may use feedforward and the data storage device may be a tape drive.

公开(公告)号：GB2496822B

公开(公告)日：2013-10-02

申请号：GB201304453

申请日：2011-08-26

Applicant: IBM

Inventor： ELEFTHERIOU EVANGELOS ,  PANTAZI ANGELIKI ,  PAPANDREOU NIKOLAOS ,  POZIDIS CHARALAMPOS ,  SEBASTIAN ABU

IPC: G11C13/00 ,  G11C11/56 ,  H01L45/00

公开(公告)号：GB2492701A

公开(公告)日：2013-01-09

申请号：GB201218792

申请日：2011-03-23

Applicant: IBM

Inventor： ELEFTHERIOU EVANGELOS ,  PANTAZI ANGELIKI ,  PAPANDREOU NIKOLAOS ,  POZIDIS CHARALAMPOS ,  SEBASTIAN ABU

IPC: G11C11/56 ,  G11C13/00

Abstract: A method is provided that comprises a step of programming the PCM cell to have a respective definite cell state by at least one current pulse flowing to the PCM cell, said respective definite cell state being defined at least by a respective definite resistance level, a step of controlling said respective current pulse by a respective bitline pulse and a respective wordline pulse, and a step of controlling said respective bitline pulse and said respective wordline pulse dependent on an actual resistance value of the PCM cell and a respective reference resistance value being defined for the definite resistance level.

公开(公告)号：GB2490828A

公开(公告)日：2012-11-14

申请号：GB201214600

申请日：2011-01-27

Applicant: IBM

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

IPC: G11B5/584

Abstract: Method for operating a storage device with a tape (TP) and a head (HU) wherein the head (HU) comprises a first and a second read element (RE1, RE2). Each read element (RE1, RE2) is operable to detect servo-pattern of a particular servo band (SP). The first and the second read element (RE1, RE2) are arranged in such a way, that the tape (TP) at first passes one of both read elements (RE1, RE2) and subsequently passes the other of both read elements (RE1, RE2) when the tape (TP) moves in a predetermined longitudinal direction (X). A tape transport direction (TPDIR) of the tape (TP) along the longitudinal direction (X) is determined. The first read element (RE1) is selected dependent on the determined tape transport direction (TPDIR), when the determined tape transport direction (TPDIR) represents a direction where the tape (TP) at first passes the first read element (RE1) and subsequently the second read element (RE2). Otherwise the second read element (RE2) is selected. A position error signal (PES1) is determined dependent on the selected read element. With respect to a predetermined lateral reference point (REF) an estimated lateral track position (d est ) at a longitudinal position (x1) of the selected read element is estimated dependent on the determined position error signal (PES1). With respect to the predetermined reference point (REF) another estimated lateral track position (d* est ) at a longitudinal position (x2) of the non- selected read element is estimated in such a way that the other estimated lateral track position (d* est ) becomes a time-delayed representation of the estimated lateral track position (d est ).

公开(公告)号：DE112011100217T5

公开(公告)日：2012-10-31

申请号：DE112011100217

申请日：2011-03-23

Applicant: IBM

Inventor： ELEFTHERIOU EVANGELOS S ,  PAPANDREOU NIKOLAOS ,  POZIDIS CHARALAMPOS ,  SEBASTIAN ABU ,  PANTAZI ANGELIKI

IPC: G11C13/00

Abstract: Es wird ein Verfahren bereitgestellt, das einen Schritt des Programmierens der PCM-Zelle durch mindestens einen Strompuls, der der PCM-Zelle zufließt, umfasst, um einen jeweiligen bestimmten Zellzustand anzunehmen, wobei der jeweilige bestimmte Zellzustand durch mindestens eine jeweilige bestimmte Widerstandsstufe festgelegt ist, und das einen Schritt des Steuerns des jeweiligen Strompulses durch einen jeweiligen Bitleitungs- und einen jeweiligen Wortleitungspuls sowie einen Schritt des Steuerns des jeweiligen Bitleitungs- und des jeweiligen Wortleitungspulses in Abhängigkeit von dem momentanen Widerstandswert der PCM-Zelle und von einem jeweiligen Bezugs-Widerstandswert umfasst, der für die bestimmte Widerstandsstufe festgelegt ist.

公开(公告)号：GB2488933A

公开(公告)日：2012-09-12

申请号：GB201209688

申请日：2010-12-17

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  PANTAZI ANGELIKI

IPC: G11B5/56

Abstract: Method for operating a storage device with a tape (TP) and a head (HU) which is operable to read and/or write data from and respectively to the tape (TP). The tape (TP) is moveable in a predetermined longitudinal direction (X). At least two consecutive current lateral tape positions (yx(t1), yx(t2)) of the tape (TP) with respect to a predetermined reference point (REF) are determined at a predetermined longitudinal capture position. A tape skew ( θ) of the tape (TP) is determined dependent on the at least two determined lateral positions (yx(t1), yx(t2)). The tape skew (θ) represents an angle between a current tape motion direction (TMD) of the tape (TP) and the longitudinal direction (X). A skew control signal (U ) is determined dependent on the determined tape skew (θ). A rotational head position ( ) of the head (HU) is controlled dependent on the skew control signal (U ) to align the head (HU) to the current tape motion direction (TMD) in such a way that the head (HU) is operable to read and/or write data.