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| Number | Title | Issue Date |
| 8134797 | Application of continuous position error offset signal to acquire servo track The method employs a servo system for positioning a head laterally to follow lateral motion of a longitudinal tape having longitudinal defined servo track(s), the servo system comprising a servo element configured to sense lateral position of the head with respect t... | 03/13/2012 |
| 7961424 | Multilevel pulse position modulation for efficient encoding of information into servo patterns A storage medium on which servo patterns are encoded to provide lateral and longitudinal position (LPOS) information is provided. Each of the servo patterns includes a servo frame, including first through fourth bursts, which are each independently modulated with mu... | 06/14/2011 |
| 7403350 | Multiple servo sensor configuration for magnetic tape timing based servo Multiple servo sensors are laterally displaced over a distance less than the transverse width of timing based servo track laterally extending transitions. The servo sensors are configured to sense the transitions, and servo detection logic detects the relative timin... | 07/22/2008 |
| 7379259 | Head actuator design for a low profile tape drive A head actuator design for a low profile tape drive is configured with a damping system for a head suspension system having flexure springs to accommodate a half-high form factor. The damping system employs hall sensors, for example, mounted on the head carriage tha... | 05/27/2008 |
| 7355805 | Magnetic tape and method of manufacturing magnetic tape, servo writer, and method of and apparatus for specifying servo band Data for specifying servo bands SB1 to SB5 is embedded in each servo signal S1 to S5 that is written on a plurality of servo bands SB1 to SB5 formed on a magnetic tape MT. ... | 04/08/2008 |
| 7352522 | Control means and method of controlling a current through a coil Method of controlling a current through a coil (L) for the generation of a magnetic field (H) in which: a parameter is determined which is a measure for the value of the resistance (RL) of the coil (L), the current (IL) through the coil (L) is ... | 04/01/2008 |
| 7312945 | Techniques for adjusting for actuator non-linearities in a data storage system The invention provides techniques for adjusting for actuator non-linearities in a data storage system. The invention is particularly useful for piezoelectric actuators, such as actuators that implement a bimorph piezoelectric crystal structure or a laminate piezoele... | 12/25/2007 |
| 7301724 | Transducing head Determining an error in position of at least two heads coupled to a piezoelectric material, and changing a potential applied to a piezoelectric material to reduce the error in position of the at least two heads. ... | 11/27/2007 |
| 7289300 | Piezoelectric motor for moving a carriage along a guide In one embodiment, an actuator comprises a stationary guide, a carriage movable along the guide, and a piezoelectric motor operatively coupled to the carriage and pushing on the guide such that the motor when energized moves with the carriage along the guide. ... | 10/30/2007 |
| 7283320 | Magnetic recording medium including servo and data bands in the magnetic layer A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recor... | 10/16/2007 |
| 7283318 | Position sensor In one embodiment, a load position sensor for a tape drive includes a tape cartridge loading mechanism, a head movable in response to movement in the loading mechanism, and a sensor operatively coupled to the head for sensing a position of the head. ... | 10/16/2007 |
| 7265931 | Apparatus to reject disk drive disturbance Track mis-registration (TMR) correction is conditionally made in a hard disk drive using servo data in a closed loop servo control scheme, along with one or more alternative sensing schemes when an external shock or vibration occurs. The alternative sensing schemes ... | 09/04/2007 |
| 7259930 | Apparatus for transporting a magnetic tape An apparatus for transporting a magnetic tape includes a writing head, a unit for generating pulse signal, a reading head and a unit for calculating transport speed. The writing head has at least two parallel and linear magnetic gaps spaced a predetermined distance ... | 08/21/2007 |
| 7254672 | Translation device driver for translating between disk device driver and tape device driver commands A translation device driver apparatus and method are disclosed. A first type of request is received from a disk-based file system to access a first type of storage device. The first type of storage device permits direct access reads and writes and implements update-... | 08/07/2007 |
| 7230780 | Method, apparatus and program storage device for providing protrusion feedback for a read/write element A method, apparatus and program storage device for providing protrusion feedback for a read/write element is disclosed. A slider with a heating element is provided to control the level of read/write element protrusion. A level of heating applied to the slider to cha... | 06/12/2007 |
| 7230788 | System and method for tape drive control A system and method for damping the motion of the head of a tape drive is disclosed. The method includes measuring the position of the head over time with a position sensor; damping the motion of the head based on the measured position of the head over time; and tun... | 06/12/2007 |
| 7227724 | Head actuator assembly for a tape drive A head actuator assembly includes a coarse positioner base assembly that is mounted on a guide shaft and an anti-rotation shaft and provides increased structural rigidity due to a four-point support and spring loading of the coarse positioner base against the anti-r... | 06/05/2007 |
| 7212373 | Servo writer and method for writing servo patterns using the same A servo writer includes a tape running drive unit for running a magnetic tape in a longitudinal direction; a pulse signal generating circuit for generating pulse signals; a write head having a plurality of linear magnetic gaps thereon in a running direction of the m... | 05/01/2007 |
| 7206161 | Servo track verification apparatus and servo writer A servo track formed on a tape-like recording medium is verified. An input unit allows a user to input information. A tape drive unit causes the tape-like recording medium to run on a predetermined route. A measurement unit is provided adjacent to the predetermined ... | 04/17/2007 |
| 7203027 | System and method for measuring the position of a tape drive head A sensor for measuring the position of the head of a tape drive is disclosed. The sensor includes a light emitter movably connected to the head; a light sensor movably connected to the head and rigidly connected to the light emitter and located to receive a beam of ... | 04/10/2007 |
| 7167326 | Tape drive that supports update-in-place A method in a data processing system is disclosed for permitting update-in-place in a tape drive. Data in a particular record in a tape that is mounted on the tape drive is modified. The particular record is located in a particular one of multiple different tracks i... | 01/23/2007 |
| 7154694 | Servo writer Disclosed is a servo writer which forms servo bands on information recording media so as to enable a drive to track the servo bands with great accuracy by using a recording/reproducing head. The servo writer includes a driving mechanism for running a tape-shaped inf... | 12/26/2006 |
| 7133261 | Tape head having a support plate with contoured surface A tape recording head is provided comprising a support plate having a contoured surface with an opening in the contoured surface which allows head chips to protrude far enough to allow proper head tape contact for recording. The support plate is fixed on a coarse ac... | 11/07/2006 |
| 7104449 | Method and apparatus for patterning cards, instruments and documents An instrument (e.g., a card or an optical data storage disc such as a CDROM) embodying the invention includes a pattern formed on or within the instrument, whereby the instrument, when illuminated by a light source, produces a unique output light pattern which can b... | 09/12/2006 |
| 7102846 | Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating charac... | 09/05/2006 |
| 7102847 | Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating charac... | 09/05/2006 |
| 7095583 | Dual mode servo pattern A servo pattern is described that facilitates high resolution and wide dynamic range to accurately pinpoint servo track centerlines on a magnetic tape. The servo pattern provides both absolute positioning information over an entire servo band and absolute positionin... | 08/22/2006 |
| 7088546 | Method to reject disk drive disturbance Track mis-registration (TMR) correction is conditionally made in a hard disk drive using servo data in a closed loop servo control scheme, along with one or more alternative sensing schemes when an external shock or vibration occurs. The alternative sensing schemes ... | 08/08/2006 |
| 7082006 | Compact optical tracking system for magnetic tape A compact optical tracking system for magnetic tape is disclosed which is independent of the magnetic format and head structure which can generate a position error signal without encoding on the servo track. A plurality of optical servo modules is arranged in a line... | 07/25/2006 |
| 7079343 | Time-based sectored servo data format The invention combines the benefits of sectored servo data with the benefits of time-based servo data. Recording media such as magnetic tape, magnetic disks, optical tape and optical disks can store servo data in a time-based sectored servo format. ... | 07/18/2006 |
| 7064913 | Enhanced read margining using dither enhanced write marginalization for mass data storage applications A recording target error rate is selected for one or more of data storage devices, and for each data storage device, a dither value is determined for each read/write head in the data storage device, wherein for each head, using a dither value for writing data, essen... | 06/20/2006 |
| 7061712 | Mono pole piece for a two stage tape drive actuator An actuator device includes a pole piece and at least one magnet for generating a magnetic field. A coarse positioner having a coil surrounding the pole piece provides coarse actuation in a direction parallel to an axis of the pole piece. A fine positioner having a ... | 06/13/2006 |
| 7054093 | Dual actuators for read-while-write recording system The invention provides a read-while-write recording system for a linear data storage medium, such as magnetic tape or other data storage medium in which data is stored on parallel data tracks that extend along a length of the medium. The invention makes use of separ... | 05/30/2006 |
| 7054097 | Tape guiding techniques for a dual actuator read-while-write recording system The invention provides a read-while-write recording system for a linear data storage medium, such as magnetic tape or other data storage medium in which data is stored on parallel data tracks that extend along a length of the medium. The invention makes use of separ... | 05/30/2006 |
| 7054100 | Magnetic tape recording/reproducing device and magnetic tape recording/reproducing system The present invention is to provide a magnetic tape recording/reproducing device capable of accurately positioning a magnetic tape relative to a magnetic head to thereby improve recording/reproduction characteristics to or from the magnetic tape even when the runnin... | 05/30/2006 |
| 7046464 | Data recording method and data recording/reproducing device, recording medium The present invention provides a data recording method a data recording and/or reproducing apparatus for recording data transmitted from a computer to a magnetic tape. In case a recording head fails to write data (data ID=582) of fragment ID=5 to a track (track 7... | 05/16/2006 |
| 7046466 | Dual density recording for direction-dependent linear media The invention provides a linear data storage medium, such as magnetic tape, in which data tracks that extend in one direction are recorded at a different density than data tracks recorded in the opposite direction. Various techniques are also described to facilitate... | 05/16/2006 |
| 7042665 | Apparatus and method for reproducing recorded signal In an apparatus for reproducing a recorded signal and the like of this invention, two reproducing heads are provided for a single track with their set positions being deviated in the track width direction. A signal selecting unit discriminates a reproducing head who... | 05/09/2006 |
| 7002771 | Method and apparatus for sensing position of a tape head in a tape drive A method for sensing position that comprises generating light, eclipsing the light according to position, sensing the amount of light not eclipsed, and inferring position according to the sensed amount of light. ... | 02/21/2006 |
| 7002763 | Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating charac... | 02/21/2006 |
