公开(公告)号：GB2517715A

公开(公告)日：2015-03-04

申请号：GB201315354

申请日：2013-08-29

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  PANTAZI ANGELIKI

IPC: G11B5/584

Abstract: A control device1 controls the transport of a tape 108 within a tape transport system 100. The control device comprises a determination unit 10, which includes a first and second servo channel for determining a first and second lateral position of the tape relative to the head 114, and for determining a lateral position difference between the first lateral position and the second lateral position. The control device also comprises a computing unit 11 for computing a number of unsupported wraps of the tape as a function of the lateral position difference, where the number of unsupported wraps corresponds to the number of layers of the tape around the take-up reel 112 having air layers in-between. The control device also computes a spring constant of the tape as a function of the number of unsupported wraps, a radius R1 of the take-up reel and a nominal tape path length. A calibration unit 12 calibrates at least one unit (13,14,15) of the tape transport system dependent on the spring constant.

公开(公告)号：GB2514829A

公开(公告)日：2014-12-10

申请号：GB201310106

申请日：2013-06-06

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  FURRER SIMEON ,  JELITTO JENS ,  LANTZ MARK ALFRED

IPC: G11B5/39

Abstract: A multi-channel current-perpendicular-to-plane (CPP) magnetoresistive read sensor 1 comprises a stack of layers 11-15 extending along a stacking direction z of the stack, and an edge surface S of the stack that is parallel to the stacking direction and further forms at least part of a bearing surface of the read sensor. The stack of layers comprises: a first contact layer 15, a free ferromagnetic layer 14, a non-magnetic layer 13, a spin injection ferromagnetic layer 12 and a second contact layer 11. The stack of layers further comprises a series of structures 30, each structure formed in both the first contact layer and the free layer. An edge surface of each of the structures is level with the edge surface of the stack and the series of structures extends along a direction x that is parallel to the bearing surface and perpendicular to the stacking direction. The structures may be defined by grooves 35.

公开(公告)号：GB2508389A

公开(公告)日：2014-06-04

申请号：GB201221557

申请日：2012-11-30

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ENGELEN JOHAN B C ,  FURRER SIMEON ,  JELITTO JENS ,  LANTZ MARK ALFRED

IPC: G11B5/584

Abstract: A tape storage medium comprises a servo band SB along a longitudinal extension x of the tape TP for determining positional information. The servo band comprises a set of servo tracks ST1-6 arranged next to each other. Each servo track of the set contains a pseudo noise sequence PN_A-C of symbols, where the pseudo noise sequences of servo patterns of adjacent servo tracks are different from each other. The set of servo tracks contains at least three servo tracks with different pseudo noise sequences. The waveforms of adjacent servo tracks may be orthogonal to each other in the time domain. The servo patterns may contain additional information such as longitudinal position, manufacturing information or a servo band identifier. A tape head contains a servo reader SR where the width of the reader wSR is at least a width of a servo track wST. A read back signal of the servo reader is used for adjusting a lateral position of a tape head.

公开(公告)号：GB2498298A

公开(公告)日：2013-07-10

申请号：GB201306562

申请日：2011-09-22

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ILIADIS ILIAS

IPC: G06F11/10

Abstract: In a solid state memory device, codewords stored in a unit of the memory device (1) are decoded by means of an error correcting iterative decoding process. An average number of iterations (n_k) needed for successfully decoding codewords of the unit is determined, and the average number of iterations (n_k) is monitored, specifically for the reason that the average number of iterations (n_k) can be taken as a measure of wear of the subject unit.

公开(公告)号：DE102012216591A1

公开(公告)日：2013-04-11

申请号：DE102012216591

申请日：2012-09-18

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  HUTCHINS ROBERT A

IPC: G11B5/008

Abstract: In einer Ausführungsform umfasst ein Bandlaufwerksystem einen Magnetkopf mit einem Servosensor zum Erkennen einer festgelegten Servospur eines Magnetbandes, und es ist so konfiguriert, dass es Servoimpulse von Servobursts der Servospur liest, während sich das Magnetband an dem Magnetkopf vorbeibewegt, wobei die Servobursts ein codiertes Datensymbol darstellen, einen Analog-Digital-Umsetzer, der so konfiguriert ist, dass er eine Sequenz an Samples des Readback-Servosignals bereitstellt, einen digitalen Korrelator, der so konfiguriert ist, dass er ein Korrelationssignal zwischen der Sequenz und einer Referenzwellenform berechnet, ein Referenz-Taktungsmodell, das so konfiguriert ist, dass es dem digitalen Korrelator ein Referenz-Taktungsmodell mit Interpolationszeitpunkten bereitstellt, einen Korrelations-Interpolator, der so konfiguriert ist, dass er das Korrelationssignal zu den Interpolationszeitpunkten interpoliert und eine Längs-(LPOS)Erfassungsmessgröße berechnet, und einen LPOS-Detektor, der so konfiguriert ist, dass er das codierte Datensymbol der Servobursts unter Verwendung der berechneten LPOS-Erfassungsmessgröße decodiert.

公开(公告)号：DE102012208141A1

公开(公告)日：2012-11-22

申请号：DE102012208141

申请日：2012-05-15

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ILIADIS ILIAS

IPC: G11C16/34

Abstract: In einem Verfahren zum Betreiben eines Computergestützten Speichers ist der Speicher so aufgebaut, dass er Daten in Einheiten dieses Speichers ablegt. Für jede Einheit (i) eines Satzes von Einheiten (i) wird ein Grad der Funktionsuntüchtigkeit (c(i)) der Einheit ermittelt. Ein maximaler Grad der Funktionsuntüchtigkeit (c_max) unter den Graden der Funktionsuntüchtigkeit (c(i)) wird ermittelt. Ein Vorschlag einer aus einer oder mehreren Einheiten (i) bestehenden Teilgruppe, diese für einen Löschvorgang von Daten auszuwählen, wird empfangen und mindestens eine Einheit (i) in der Teilgruppe, deren Grad der Funktionsuntüchtigkeit (c(i)) geringer als der maximale Grad der Funktionsuntüchtigkeit (c_max) ist, wird für einen späteren Löschvorgang von Daten gekennzeichnet.

公开(公告)号：GB2490991A

公开(公告)日：2012-11-21

申请号：GB201204152

申请日：2012-03-09

Applicant: IBM

Inventor： ILIADIS ILIAS ,  CHERUBINI GIOVANNI

IPC: G06F12/02

Abstract: Method for operating a memory (flash, phase change, magnetic RAM memory) storing data in units (blocks). For each unit of a set a wear level is determined. A maximum wear level amongst the wear levels is determined, step 62. A suggestion of a subset of units for being selected for data erasure is received and at least one unit in the subset is identified for data erasure (step 62), a wear level of which unit is less than maximum wear level, as determined in step 55. The wear level is based on count of erasures. A unit comprises a set of subunits (pages) and units are suggested for data erasure subject to a number of subunits containing valid data. If wear level of each unit equals maximum wear level, a unit is identified for erasure in view of a characteristic other than wear level as in steps 57-58. The approach of the invention can be combined with garbage collection schemes, provides minimized wear imbalance and essentially same degree of usage of all blocks (steps 54-56), prolongs lifetime of the memory (endurance), and can be applied to log-structured file systems. Also claimed is a storage device comprising a controller.

公开(公告)号：DE60203055T2

公开(公告)日：2006-05-11

申请号：DE60203055

申请日：2002-07-19

Applicant: IBM

Inventor： BAECHTOLD PETER ,  BINNIG K ,  CHERUBINI GIOVANNI ,  DHOLAKIA AJAY ,  DUERIG T ,  ELEFTHERIOU S ,  LOELIGER W ,  VETTIGER PETER

IPC: G11B9/14 ,  G11B9/00 ,  G11B20/10 ,  G11B20/18

Abstract: Apparatus for detecting data in a sensor signal generated by a read sensor in a local probe data storage device comprises a differentiation for subtracting a value of the sensor signal from the succeeding value of the sensor signal to generate a ternary difference signal; and a convertor connected to the differentiator for converting the difference signal into a binary output signal indicative of the detected data. A local probe data storage device comprising such apparatus is also described.

公开(公告)号：DE69427135T2

公开(公告)日：2001-09-13

申请号：DE69427135

申请日：1994-12-28

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  OELCER SEDAT ,  UNGERBOECK GOTTFRIED

IPC: H03H21/00 ,  H04B3/06 ,  H04L25/03 ,  H04L25/497

公开(公告)号：DE112018001829T5

公开(公告)日：2019-12-12

申请号：DE112018001829

申请日：2018-05-30

Applicant: IBM

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

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

Abstract: Berechnen von Pfadmetriken, die zu jeweiligen Zuständen eines Trellis mit n Zuständen gehören, durch Summieren von Verzweigungsmetriken in einem Sequenzdetektor. Jede Pfadmetrik wird durch N Bits plus einem Übertragsbit zum Angeben eines Übertrags des N-Bit-Werts dieser Pfadmetrik dargestellt.