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55results about "Longitudinal format" patented technology
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Robust metric computation of longitudinal position (LPOS) data symbol detection
InactiveUS8576510B2Driving/moving recording headsAlignment for track following on tapesMagnetic tapeEngineering
In one embodiment, a tape drive system includes a magnetic head having a servo sensor for sensing a defined servo track of a magnetic tape and configured to read servo pulses from servo bursts of the servo track while the magnetic tape is moving past the magnetic head with the servo bursts representing an encoded data symbol, an analog-to-digital converter configured to provide a sequence of samples of the readback servo signal, a digital correlator configured to compute a correlation signal between the sequence and a reference waveform, a timing reference module configured to provide a reference timing model having interpolation instants to the digital correlator, a correlation interpolator configured to interpolate the correlation signal at the interpolation instants and compute a longitudinal position (LPOS) detection metric, and an LPOS detector configured to decode the encoded data symbol of the servo bursts using the computed LPOS detection metric.
Owner:IBM CORP
Robust metric computation of longitudinal position (LPOS) data symbol detection
InactiveUS20130088794A1Driving/moving recording headsAlignment for track following on tapesMagnetic tapeControl theory
In one embodiment, a tape drive system includes a magnetic head having a servo sensor for sensing a defined servo track of a magnetic tape and configured to read servo pulses from servo bursts of the servo track while the magnetic tape is moving past the magnetic head with the servo bursts representing an encoded data symbol, an analog-to-digital converter configured to provide a sequence of samples of the readback servo signal, a digital correlator configured to compute a correlation signal between the sequence and a reference waveform, a timing reference module configured to provide a reference timing model having interpolation instants to the digital correlator, a correlation interpolator configured to interpolate the correlation signal at the interpolation instants and compute a longitudinal position (LPOS) detection metric, and an LPOS detector configured to decode the encoded data symbol of the servo bursts using the computed LPOS detection metric.
Owner:IBM CORP
Magnetic tape
ActiveUS20180061446A1Deterioration of characteristicMagnetic materials for record carriersTape carriersConventional transmission electron microscopeScanning tunneling microscope
Provided is a magnetic tape in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive, a percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region is equal to or greater than 0.02% and less than 0.06%, and a tilt cos 0 of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
Owner:FUJIFILM CORP
Data recording apparatus, and data recording control method and program
InactiveUS20060047894A1Recording carrier detailsFilamentary/web record carriersInformation processingMagnetic tape
A data recording apparatus controls writing to and reading from a recording medium such as a magnetic tape, etc. loaded based on input / output requests from a host. A medium information acquiring unit acquires the number of medium marks read out from a memory disposed on a housing of the recording medium when the recording medium has been loaded. Having received an end positioning order from the host, a positioning control unit positions the end position of the recorded portion on the recording medium to the head based on the number of the tape marks acquired by the medium information processing unit.
Owner:FUJITSU LTD
Multiple section read/write head
ActiveUS20080158720A1Minimized pitchManufacturing heads with multiple gapsManufacture unitary devices of plural headsMagnetic tapeComputer science
Owner:ORACLE INT CORP
Tape Recorder And Tape Recording That Increases Empty Tape Area Without Loss of Necessary Data
InactiveUS20110122522A1Increase the areaReduce decreaseElectronic editing digitised analogue information signalsFilamentary/web record carriersTape recorderComputer science
Provided is a tape recorder that has a tape including at least one partition and that controls access to the tape. The tape recorder includes: means for identifying a position of data on the tape; means for sequentially reading necessary data areas in the data; means for sequentially copying the necessary data areas to the beginning of an empty area on the tape; means for creating a continuous front empty area formed of unnecessary data areas and copy source areas of the necessary data areas on the tape; and means for moving a beginning of the partition (BOP) to a position immediately after the front empty area and for updating the position information on the beginning of the partition.
Owner:LENOVO GLOBAL TECH INT LTD
Ecc interleaving for multi-track recording on magnetic tape
ActiveUS20100180180A1Not degrade error rate performanceImprove performanceCode conversionRecord information storageData setHigh rate
Conventional C2 coding and interleaving for multi-track data tape in LTO-¾ do not support recording data onto a number of concurrent tracks which is not a power of two. Higher-rate longer C2 codes, which do not degrade error rate performance, are provided. An adjustable format and interleaving scheme accommodates future tape drives in which the number of concurrent tracks is not necessarily a power of two. A data set is segmented into a plurality of unencoded subdata sets and parity bytes are generated for each row and column. The parameters of the C2 code include N2 as the least common multiple of the number of possible tracks to which codeword objects are to be written. COs are formed from N2 C1 codewords, mapped onto a logical data track according to information within headers of the CO and modulation encoded into synchronized COs which are written to the tape.
Owner:GLOBALFOUNDRIES US INC
Primary storage media with associated secondary storage media for efficient data management
ActiveUS20110238905A1Flat record carrier combinationsRecording carrier detailsFile systemMagnetic tape
A system according to one embodiment includes a tape cartridge, the tape cartridge comprising: a housing; a magnetic recording tape in the housing; and a non-tape nonvolatile memory coupled to the housing, the nonvolatile memory being for storing therein an index comprising file system information for a plurality of files stored on the magnetic recording tape. A method for storing data on a tape cartridge according to one embodiment includes writing a plurality of files to a magnetic recording tape of a tape cartridge; and writing an index to a non-tape nonvolatile memory of the tape cartridge, the index including information about locations of data of the plurality of files on the magnetic recording tape.
Owner:IBM CORP
Magnetic tape storage, method for writing data to magnetic tape, and medium for writing data program
InactiveUS20080007856A1Reduce frequencySimple methodRecording carrier detailsRecord information storageData setMagnetic tape
In a magnetic tape storage including a nonvolatile buffer memory, the buffer memory memorizing sets of data sent from a host computer, a set of data including a pair of one file and one tape mark, the tape mark showing the end of the file, sets of data are continuously stored in the buffer memory until the total data amount of the sets of data comes up to a predetermined data amount, and the sets of data stored in the buffer memory are wrote to a magnetic tape (called flushing) when the total data amount of the sets of data in the buffer memory exceeds the predetermined data amount. The frequency of the flushing and tape reposition according to the flushing can be greatly decreased. The wear-out of the magnetic tape and mechanical section relating to the magnetic tape running in the storage can be reduced.
Owner:FUJITSU LTD
Multiple section read/write head
ActiveUS7505221B2Minimized pitchManufacturing heads with multiple gapsManufacture unitary devices of plural headsMagnetic tapeComputer science
Owner:ORACLE INT CORP
Rewrite-efficient ECC/interleaving for multi-track recording on magnetic tape
For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K2 rows and K1 columns. For each unencoded subdata set, N1-K1 C1-parity bytes are generated for each row and N2-K2 C2-parity bytes are generated for each column. The C1 and C2 parity bytes are appended to the ends of the row and column, respectively, to form encoded C1 and C2 codewords, respectively. All of the C1 codewords per data set are endowed with a specific codeword header to form a plurality of partial codeword objects (PCOs). Each PCO is mapped onto a logical data track according to information within the header. On each logical data track, adjacent PCOs are merged to form COs which are modulation encoded and mapped into synchronized COs. Then T synchronized COs are written simultaneously to the data tape where T is the number of concurrent active tracks on the data tape.
Owner:INT BUSINESS MASCH CORP
Servo error detection and compensation utilizing virtual data tracking servo methods
ActiveUS20080266705A1Driving/moving recording headsAlignment for track following on tapesMagnetic storagePosition error
A method for detecting errors in a servo system of a magnetic storage drive includes writing a plurality of data tracks at a pitch, detecting a position of an edge of at least two of the data tracks under control of a servo system (e.g., an optical or magnetic servo system), and determining an error in the servo system based on the detected positions and known pitch of the data tracks. Differences in the track edge positions of the tracks from the positions at which they were written may indicate errors in the optical servo system (e.g., non-linearity errors, as well as other errors such as electrical, temperature, or the like). Determined errors may be stored with a look-up table of positional errors or used to normalize a position algorithm associated with the servo system.
Owner:QUANTUM CORP
System and method for faster data retrieval from tape media
ActiveUS8244953B1Input/output to record carriersError detection/correctionData retrievalMagnetic tape
The present invention is a system and method for extending the functionality of tape device tapemarks. When data is backed up to tape, the tape controller may mark the tape with a tapemark to organize portions of the tape. Present tape storage devices are limited to a single type of tapemark; therefore current recovery requests require knowledge of the tapemark location. The present invention allows for unique types of tapemarks. By allowing the tape device, tape controller and / or backup and recovery software to recognize unique tapemarks, data organized by unique tapemarks can be recovered without referencing tapemark location, thereby optimizing recovery. Unique tapemarks may be encrypted such that data recovery is only completed upon verification of the requester.
Owner:EMC IP HLDG CO LLC
Virtual jukebox
InactiveUS6937541B2Easy accessEasy to createRecord information storageBuying/selling/leasing transactionsHard disc driveMass storage
A collection management system, or virtual jukebox, is provided for a collection of recordings that is independent of the physical media upon which the material is recorded. The system forms a part of a network that includes storage media and playback devices, and provides an easy to use system for collection cataloging, archiving, and retrieval. In a preferred embodiment, a collection management system resides on a consumer electronic (CE) device, or a personal or home computer (PC), and the collection includes recordings that are stored on one or more hard drives associated with the CE device or the PC. The collection management system includes a user interface that facilitates the retrieval of recordings for playback from one or more storage devices, based on an individual selection of genre, author, and so on. By storing the recordings on a hard disc drive or other mass storage device with an associated disk operating system, immediate access is available to each recording on the drive, and additional drives can be added to the system as new material is added to the collection.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Rewrite-efficient ecc/interleaving for multi-track recording on magnetic tape
For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K2 rows and K1 columns. For each unencoded subdata set, N1−K1 C1-parity bytes are generated for each row and N2−K2 C2-parity bytes are generated for each column. The C1 and C2 parity bytes are appended to the ends of the row and column, respectively, to form encoded C1 and C2 codewords, respectively. All of the C1 codewords per data set are endowed with a specific codeword header to form a plurality of partial codeword objects (PCOs). Each PCO is mapped onto a logical data track according to information within the header. On each logical data track, adjacent PCOs are merged to form COs which are modulation encoded and mapped into synchronized COs. Then T synchronized COs are written simultaneously to the data tape where T is the number of concurrent active tracks on the data tape.
Owner:IBM CORP
System, method, and computer program product for fast recovery to a write state
InactiveUS20120307390A1Reduce determined position errorLocation determinationFilamentary/web record carriersAlignment for track following on tapesMagnetic tapeMotion controller
In one embodiment, a tape drive system includes a magnetic head having at least one servo sensor for track-following at least one defined servo track of a longitudinal tape, a tape motion controller configured to move the longitudinal tape past the magnetic head, a compound actuator configured to translate the magnetic head laterally with respect to the longitudinal tape, and a control configured to track-follow the at least one defined servo track by reducing a position error between the magnetic head and a desired position, transition from a write state to a monitor state when the position error is greater than a threshold, transition from the monitor state to a stop write state when the position error is greater than the threshold for a first period, and transition from the monitor state to the write state when the position error is less than the threshold for a second period.
Owner:IBM CORP
Error correction coding of longitudinal position information
InactiveUS7787204B2Improve detection reliabilityLower latencyAlignment for track following on tapesSerpentine formatEngineeringSequential data
Owner:INT BUSINESS MASCH CORP
Method for fast recovery to a write state
InactiveUS20120307392A1Not be determined in advanceReduce the determined position errorAlignment for track following on tapesRecord information storageEngineeringActuator
In one embodiment, a method includes sensing a servo sensor while a longitudinal tape is moved past a magnetic head, determining position error between the magnetic head and a desired position related to the at least one defined servo track; providing signals to operate a fine actuator to translate the magnetic head laterally in a manner to reduce the determined position error; transitioning from a write state to a monitor state when the determined position error is greater than a threshold error value; transitioning from the monitor state to a stop write state when the determined position error is greater than the threshold error value for a first predetermined period; and transitioning from the monitor state to the write state when the determined position error is less than the threshold error value for a second predetermined period.
Owner:IBM CORP
Correcting errors in longitudinal position (LPOS) words
The invention includes a method for longitudinal position (LPOS) detection in a magnetic tape storage system for storing data upon linear tape open (LTO) magnetic storage tape, which data includes odd and even 36-bit LPOS words with error correcting ability. The method includes steps of encoding positional information onto the magnetic storage tape within the odd and even 36-bit LPOS words using each LPOS word's 8-bit sync mark field, Sy, and six of each LPOS word's 4-bit symbol fields, L0, L1, L2 L3, L4, and L5, wherein 6 of 24 total bits comprising the encoded 8-bit sync mark field: Sy, and six 4-bit symbol fields: L0, L1, L2 L3, L4, and L5 are utilized as parity bits, operating the magnetic tape storage system by passing the LTO magnetic storage tape encoded with the odd and even LPOS words with error correcting ability longitudinally across a servo reader / writer at a known speed, decoding the encoded positional information by reading either two words sequentially or two words simultaneously, the simultaneous reading requiring that the LPOS words include servo band numbers and detecting and correcting both ambiguous bits and single erroneous bit errors.
Owner:GLOBALFOUNDRIES US INC
ECC interleaving for multi-track recording on magnetic tape
Conventional C2 coding and interleaving for multi-track data tape in LTO-3 / 4 do not support recording data onto a number of concurrent tracks which is not a power of two. Higher-rate longer C2 codes, which do not degrade error rate performance, are provided. An adjustable format and interleaving scheme accommodates future tape drives in which the number of concurrent tracks is not necessarily a power of two. A data set is segmented into a plurality of unencoded subdata sets and parity bytes are generated for each row and column. The parameters of the C2 code include N2 as the least common multiple of the number of possible tracks to which codeword objects are to be written. COs are formed from N2 C1 codewords, mapped onto a logical data track according to information within headers of the CO and modulation encoded into synchronized COs which are written to the tape.
Owner:GLOBALFOUNDRIES U S INC
Tape recorder and tape recording that increases empty tape area without loss of necessary data
InactiveUS8477440B2Increase the areaIncrease empty areaElectronic editing digitised analogue information signalsRecord information storageMagnetic tapeTape recorder
Provided is a tape recorder that has a tape including at least one partition and that controls access to the tape. The tape recorder includes: means for identifying a position of data on the tape; means for sequentially reading necessary data areas in the data; means for sequentially copying the necessary data areas to the beginning of an empty area on the tape; means for creating a continuous front empty area formed of unnecessary data areas and copy source areas of the necessary data areas on the tape; and means for moving a beginning of the partition (BOP) to a position immediately after the front empty area and for updating the position information on the beginning of the partition.
Owner:LENOVO GLOBAL TECH INT LTD
Error correction coding of longitudinal position information
InactiveUS20090237832A1Improve detection reliabilityReduce decoding delayAlignment for track following on tapesRecord information storageEngineeringCorrection code
A sequential data storage medium, comprising a sequence of plurality of servo patterns that provide lateral position information and longitudinal position information, wherein each of the plurality of servo patterns comprises a first burst comprising a first plurality of pulses, a second burst comprising a second plurality of pulses, a third burst comprising a third plurality of pulses, and a fourth burst comprising a fourth plurality of pulses. The spacings between the first plurality of pulses, in combination with the spacings between the second plurality of pulses, encode a first bit without affecting the recovery of lateral position information. The spacings between the third plurality of pulses, in combination with the spacings between the fourth plurality of pulses, encode a second bit without affecting the recovery of lateral position information. The sequence of plurality of servo patterns comprises a sequence of the first bits and a sequence of the second bits to form an error-correction codeword providing error-correction capability.
Owner:IBM CORP
Error correction capability for longitudinal position data in a tape storage system
InactiveUS7813070B2Alignment for track following on tapesSerpentine formatComputer hardwareWord type
A longitudinal position (LPOS) word L(n) is encoded with error correction capability. The LPOS word includes a plurality of LPOS symbols L0(n) through Lk(n) calculated asL(n)=∑i=05Li(n)14iand representing a longitudinal position of a magnetic tape relative to a tape head in a tape storage system. A word type is determined in response to at least one of the plurality of LPOS symbols and, in response to the determined word type, at least one formatted symbol F(n) is generated from the plurality of LPOS symbols L(n). At least one parity symbol P(n) is generated from the formatted symbol F(n). The formatted and parity symbols are communicated to a servo channel of the tape storage system to be recorded onto a servo track of the magnetic tape. Adding redundancy to LPOS words provides the capability of correcting multiple bit errors without increasing the LPOS word length.
Owner:IBM CORP
Error correction capability for longitudinal position data in a tape storage system
InactiveUS20090207515A1Alignment for track following on tapesSerpentine formatSoftware engineeringMechanical engineering
A longitudinal position (LPOS) word L(n) is encoded with error correction capability. The LPOS word includes a plurality of LPOS symbols L0(n) through Lk(n) calculated asL(n)=∑i=05Li(n)14iand representing a longitudinal position of a magnetic tape relative to a tape head in a tape storage system. A word type is determined in response to at least one of the plurality of LPOS symbols and, in response to the determined word type, at least one formatted symbol F(n) is generated from the plurality of LPOS symbols L(n). At least one parity symbol P(n) is generated from the formatted symbol F(n). The formatted and parity symbols are communicated to a servo channel of the tape storage system to be recorded onto a servo track of the magnetic tape. Adding redundancy to LPOS words provides the capability of correcting multiple bit errors without increasing the LPOS word length.
Owner:IBM CORP
Data storage devices for large size data structures
InactiveUS7124124B1Data fragmentation is avoidedAvoid fragmentationData processing applicationsAlignment for track following on tapesComputer hardwareLarge size
A data storage device includes a recording head assembly having a recording head and a servo head operatively connected to the recording head, a recording medium capable of being positioned relative to the recording head assembly for recording data in a longitudinal recording direction, and a control interface for receiving data of a file to be recorded on the recording medium and positioning information for positioning the recording medium relative to the recording head assembly. The file data is recorded on the recording medium as a logical ring located within a logical cylinder spanning a finite length on the recording medium, with all data for the file being stored in a single logical ring on a single recording medium. The logical cylinder occupies a portion of the single recording medium.
Owner:QUANTUM CORP
Enabling partial write during a tape skew
InactiveUS20140002916A1Alignment for track following on tapesRecord information storageEngineeringLongitudinal data
A system provides tape having at least one longitudinal data track and a tape head operative to move along a single axis line lateral to the data track. The storage tape moves across the tape head. The tape head moves along the axis line such that a write element of the tape head intersects the data track and writes data to a section of the data track. A controller determines that the storage tape is skewed. In response to determining that the storage tape is skewed, the controller determines a position along the axis line and a time to move the tape head such that the read elements intersects the section of the data track. At the determined time, the tape head pauses writing of data and moves to the position along the axis line. The tape head reads the section of the data track to verify the written data.
Owner:IBM CORP
Servo error detection and compensation utilizing virtual data tracking servo methods
ActiveUS7826169B2Driving/moving recording headsAlignment for track following on tapesMagnetic storagePosition error
A method for detecting errors in a servo system of a magnetic storage drive includes writing a plurality of data tracks at a pitch, detecting a position of an edge of at least two of the data tracks under control of a servo system (e.g., an optical or magnetic servo system), and determining an error in the servo system based on the detected positions and known pitch of the data tracks. Differences in the track edge positions of the tracks from the positions at which they were written may indicate errors in the optical servo system (e.g., non-linearity errors, as well as other errors such as electrical, temperature, or the like). Determined errors may be stored with a look-up table of positional errors or used to normalize a position algorithm associated with the servo system.
Owner:QUANTUM CORP
Erase drive system and methods of erasure for tape data cartridge
InactiveUS20110043940A1Reduce and minimize errorReduce and minimize and tolerance stack upsErasing methodRecord information storageComputer hardwareMagnetic tape
The present disclosure relates generally to writing and reading data from a magnetic tape storage media and, more particularly, to a secure erasure system for the eradication of the data contained in the data tracks of a tape media such that substantially all of the data can be erased while leaving the servo bands substantially unaltered or within specification. A data tape cartridge erased with such a system can then be reused in a secure data storage environment with complete confidence that any data from a previous usage is not subject to discovery.
Owner:ADVANCED RES
Erase drive system and methods of erasure for tape data cartridge
InactiveUS8767331B2Reduce and minimize errorReduce and minimize and toleranceErasing methodRecord information storageComputer hardwareMagnetic tape
The present disclosure relates generally to writing and reading data from a magnetic tape storage media and, more particularly, to a secure erasure system for the eradication of the data contained in the data tracks of a tape media such that substantially all of the data can be erased while leaving the servo bands substantially unaltered or within specification. A data tape cartridge erased with such a system can then be reused in a secure data storage environment with complete confidence that any data from a previous usage is not subject to discovery.
Owner:ADVANCED RES
Correcting errors in longitudinal position (LPOS) words
The invention includes a method for longitudinal position (LPOS) detection in a magnetic tape storage system for storing data upon linear tape open (LTO) magnetic storage tape, which data includes odd and even 36-bit LPOS words with error correcting ability. The method includes steps of encoding positional information onto the magnetic storage tape within the odd and even 36-bit LPOS words using each LPOS word's 8-bit sync mark field, Sy, and six of each LPOS word's 4-bit symbol fields, L0, L1, L2 L3, L4, and L5, wherein 6 of 24 total bits comprising the encoded 8-bit sync mark field: Sy, and six 4-bit symbol fields: L0, L1, L2 L3, L4, and L5 are utilized as parity bits, operating the magnetic tape storage system by passing the LTO magnetic storage tape encoded with the odd and even LPOS words with error correcting ability longitudinally across a servo reader / writer at a known speed, decoding the encoded positional information by reading either two words sequentially or two words simultaneously, the simultaneous reading requiring that the LPOS words include servo band numbers and detecting and correcting both ambiguous bits and single erroneous bit errors.
Owner:GLOBALFOUNDRIES US INC
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