International Business Machines Corporation

Globalfoundries Inc.

Other

Swisslitho Ag

Mark Alfred Lantz

Simeon Furrer

Giovanni Cherubini

Hugo Eric Rothuizen

Jens Jelitto

Robert G Biskeborn

Johan B C Engelen

Nhan Xuan Bui

Roy Daron Cideciyan

Angeliki Pantazi

Kevin Bruce Judd

Edwin Ralph Childers

Evangelos Stavros Eleftheriou

Walter Haeberle

Robert Allan Hutchins

Urs T Duerig

Michel Despont

Randy Clark Inch

Bernd W Gotsmann

Charalampos Pozidis

Sri Muthuthamby Sri-Jayantha

Icko E T Iben

Peter Vettiger

Hien Phu Dang

Arun Sharma

Laurent A Dellmann

Gerd K Binnig

David H F Harper

Johan Engelen

Thomas R Albrecht

Keisuke Tanaka

Kevin Dale Butt

David Harper

Vinodh Venkatesan

Kazuhiro Tsuruta

Ernest Stewart Gale

Ilias Iliadis

Tomoko Taketomi

Paul Merril Greco

Armando Jesus Argumedo

Slavisa Sarafijanovic

Wabe W Koelmans

Dylan J Boday

Robert Dennis Miller

Robert Fontana

Stefano Sergio Oggioni

Jason Liang

Bruno Michel

Thomas J Brunschwiler

Craig Jon Hawker

Armin W Knoll

Paul Merrill Greco

Pierre-Olivier Jubert

Jane Elizabeth Frommer

Diana Joyce Hellman

Dorothea W Wiesmann Rothuizen

Peter Reininger

Luzius Kronig

Robert Allen Hutchins

Praveen Viraraghavan

David Lee Swanson

Masayuki Iwanaga

Tomas Tuma

Scott Jeffrey Schaffer

Vara Sudananda Prasad Jonnalagadda

Beat Eugen Weiss

Yusik Kim

Martin Petermann

Venkataraman Kartik

Gerd K Binning

Stella Brach

Georg Lothar Lauhoff

Taras Lehinevych

Johan Bc Engelen

Evangelos Elefheriou

Provided are a computer program product, device, system, and method for compensating for a nonlinear deformation field of a tape of a tape storage system. In one embodiment, a head beam of a tape head module of a tape drive employing active skew-based TDS compensation, is segmented into linear segments which are pivotally coupled to each other. Each linear beam segment carries a portion of the transducer array of the tape head module to form a tape head module segment. The pivot angle between a pair of pivotally coupled head module segments of the tape head may be controlled by a controllable pivot actuator to provide an independently adjustable skew angle for each module segment with respect to the direction of travel of tape. As a result, it is believed that registration between the transducers of each module segment and data tracks of the tape may be improved.

Segmented tape head

In an approach to improve write transducers a write transducer for recording data on a magnetic media is disclosed. The write transducer comprises a first pole piece. The write transducer further comprises a second pole piece. The first pole piece and the second pole piece are arranged in such a way, that a write gap is formed between the first pole piece and the second pole piece. A longitudinal axis is defined between opposite ends of the write gap. A length of the write gap along the longitudinal axis varies in the direction transverse to the longitudinal axis.

Magnetic write transducer with variable write gap length

An apparatus for a reworkable tape track following actuator includes a spring actuator, a head module, a voice coil, and a mounting body, where the spring actuator is coupled to the mounting body and the mounting body is removable from a tape drive assembly. The apparatus further includes the head module being coupled to a middle section of the spring actuator and the voice coil being positioned beneath the head module.

Reworkable tape track following actuator

Provided are a tape head controller, tape drive, and method for adjusting a skew angle and lateral position of a tape head to reduce track placement errors. A tape head is rotated at a nominal skew with respect to a tape medium to position servo readers in servo patterns. Data writers are located in a first plane of the tape head and the servo readers are located in a second plane in the tape head. The first and the second planes are separated by a distance. Repeatedly determining a skew angle comprising the nominal skew adjusted by a delta angle, at which to rotate the tape head to position the servo readers in the servo patterns. Repeatedly determining a lateral position error based on the distance and the delta angle. Repeatedly adjusting a lateral position of the tape head using the lateral position error to position the data writers in target data track locations at which to write data.

Adjusting a skew angle and lateral position of a tape head to reduce track placement errors

Provided are a computer program product, device, system, and method for write data management. In one embodiment, a write management controller calculates an order for writing data and parity blocks of write data code words on tape media in a variable interleaved fashion which ensures a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word. The calculated write order information may be provided back to a host or other data source so that the write data is eventually transmitted to the tape drive for writing on tape media in accordance with the calculated write order. In this manner, a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word may be achieved to increase the reliability of the data storage.

Write data management

In response to a rotation of timing-based servo (TBS) patterns of a first servo band and a second servo band, heights of top and bottom portions of servo stripes of servo frames of the TBS patterns are adjusted to compensate for changes in a usable height of the servo stripes caused by the rotation.

Servo pattern for skew based tape dimensional stability compensation

A computer-implemented method and a related tape library system for controlling an operation of a tape library system comprising at least one magnetic-tape drive unit and a plurality of tape cartridges, wherein the operation of the tape library system comprises a usage optimization of available resources of the tape library system, is disclosed. The method comprises determining a load value of the resources of the tape library system, accumulating requests to a tape cartridge in a batch before using tape library system to physically accessing the tape cartridge, and dynamically adjusting a number of requests in the batch before physically accessing the tape cartridge dependent on the load value such that a response time of the tape library system is optimized.

Batch scheme for magnetic-tape operation

In one aspect of the present disclosure, the degree of side erasure occurring in neighboring tracks is controlled by controlling the skew angle of the tape head, relative to the longitudinal direction of motion of the tape past the head as a track is written. In one embodiment, the tape head is rotated relative to the longitudinal direction of tape travel, and the trailing edge of the tape head which forms an acute angle with the edge of a track being written, is used for writing tracks at a desired track pitch. Other aspects and advantages may be provided, depending upon the particular application.

Side erasure control for track writing in a system

Provided are a tape guide roller and tape drive having a guide roller having magnets and bushings to stabilize a roller barrel for a tape medium. The tape guide roller has a roller barrel extending around a vertical axis. The tape medium passes across the roller barrel to guide the tape medium on a tape path. A plurality of magnets positioned with respect to the vertical axis provide an axial force to stabilize the tape guide roller axially.

Guide roller having magnets and bushings to stabilize a roller barrel for a tape medium

In one general embodiment, a data storage product includes a magnetic recording tape having written thereon at least two servo tracks extending along a longitudinal axis of the tape. Each servo track has a timing-based servo (TBS) pattern comprising a series of servo frames arranged to enable lateral positioning of a magnetic head relative to the servo tracks as well as tape dimensional stability (TDS) compensation via head skew. Each frame comprises a sequence of pairs of leading and trailing servo stripes. Midpoints between the servo stripes in each pair, at all points having a same relative lateral height on the tape, are located along a virtual median line oriented at an angle β from perpendicular to the longitudinal axis of the tape, the angle β being greater than 1 degree.

Magnetic recording tape having servo pattern for tape dimensional stability compensation via head skew

An apparatus such as a device having a writer for magnetic media has a trailing pole piece having a portion adjacent a write gap, the portion having a throat height (h) of between about 100 and about 800 nm, and an aspect ratio of thickness/throat height (t/h) in a range of 0.5 and 2.

Magnetic write head with flux blockade structure

A data storage system comprises: a head configured to produce a signal representing data stored on a storage medium; an estimator configured to determine an estimated signal comprising a superposition of an estimated linear portion of a partial-response equalizer output and an estimated nonlinear portion of the signal; a bank of noise whitening filters configured for filtering a difference between the signal and the estimated signal; a branch metric calculator configured to calculate branch metrics based on the filtered signal; and an adaptive data-dependent noise-predictive maximum likelihood sequence detector configured to generate an output stream representing the data based on the one or more branch metrics.

Adaptive data detection on a nonlinear channel

Provided are a tape erase element, tape erase device, and method for forming a tape erase element to erase content of a tape medium. The tape erase element comprises a housing forming a gap extending along a length of an outer surface of the housing. The gap extends from the outer surface of the housing to open into an inner space formed within the housing. A magnet is positioned within the inner space of the housing and having a surface extending across the gap. The magnet produces a magnetic flux that extends through a tape contact zone extending across a portion of the outer surface of the housing and the gap to erase content on the tape medium as the tape guide rollers guide the tape medium across the housing through the tape contact zone.

Tape erase element included in a tape erase device to erase a tape medium

A method for data storage tape access ordering is provided. The method receives an order request for accessing a plurality of data segments stored on a data storage tape. Each data segment is defined by segment characteristics. The method identifies a number of data segments within the plurality of data segments in the order request. The method determines an order model based on the number of data segments and the segment characteristics of the plurality of data segments. The method generates an access order for the plurality of data segments based on the order model and retrieves a subset of data segments from the data storage tape based on the access order.

Group-based tape storage access ordering

Growing community of inventors

Adliswil, Switzerland

Mark Alfred Lantz