Class / Patent application number | Description | Number of patent applications / Date published |
360076000 | Azimuth or skew | 27 |
20080266705 | Servo error detection and compensation utilizing virtual data tracking servo methods - 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. | 10-30-2008 |
20080285169 | MAGNETIC DISK DRIVE - In a magnetic disk drive having a magnetic circuit for moving a magnetic head by driving an actuator having the magnetic head mounted thereon, to a target track, and a base having a height criterion member for carrying out positioning in a height direction of the magnetic circuit as a result of the magnetic circuit being fixed thereto, wherein in a condition in which the magnetic circuit is fixed to the height criterion member, a space is provided between the base and a bottom surface, a spring member is provided for applying force to the magnetic circuit in such a direction that the magnetic circuit is apart from the bottom surface. | 11-20-2008 |
20090002871 | METHOD AND APPARATUS FOR HEAD POSITIONING USING SPIRAL SERVO PATTERNS IN A DISK DRIVE - According to one embodiment, a disk drive having a disk, a read head, a servo controller, and a CPU. In the disk, a multi-spiral servo pattern is recorded. The read head reproduces a hexagon-shaped detection signal from the multi-spiral servo pattern. The servo controller generates amplitudes values for respective frames, from the multi-spiral servo pattern. The CPU performs positional-error calculation by using the amplitude values for the frames. Upon detecting a positional change of the head is detected, the CPU performs the positional-error calculation by using the amplitude values generated at the time of replacing the frames with other frames, and corrects the positional error by adding an offset determined from the positional change of the head, to the result of the positional-error calculation. | 01-01-2009 |
20090097152 | PATTERNED MEDIA WITH SPACINGS ADJUSTED BY A SKEW FUNCTION - Recording media comprises multiple first and second patterned media islands sequentially placed at different first and second radii along a length of a recording track. A recording head sequentially accesses the first and second islands as the head moves along a length of the recording track. Circumferential spacings between sequential first and second islands along the length of the track vary as a skew function of a track radius. | 04-16-2009 |
20090097153 | READ/WRITE HEAD AZIMUTH DETERMINATION VIA SERVO BAND SIGNAL INFORMATION - The present invention, in particular embodiments, provides methods, apparatuses and systems directed to calculating azimuth of a read/write head via signals transduced from a servo read pattern of a tape. The signals are utilized to calculate azimuth of the read/write head which is displayed on a screen. An operator can then utilize the displayed azimuth information to properly adjust the read/write head azimuth. | 04-16-2009 |
20090097154 | Optimizing storage capacity by smoothly varying track pitch across a disk surface - A method for operating a fixed media hard disk drive using a plurality of disks on each of which the ratio of servo track pitch to data track pitch is smoothly varied across the surface of the disk as data is being written. The method allows the density of data on each disk to be independently varied, the total data capacity of a disk to be independently varied and introduces a degree of flexibility into the process of testing disk formatting. The method includes the use of a smooth and continuous function having a set of adjustable parameters, by whose definition a relationship between the two pitches is established within the data band. The method can also be applied to disks that are divided into radial zones to take advantage of additional properties of data writing and reading within a hard disk drive. | 04-16-2009 |
20090161247 | Channel Skew Identification and Notification - Embodiments of the present invention analyze a plurality of parallel channels and identify specific channel(s) that have skew outside of an acceptable skew error margin. In certain embodiments, this skew is identified by determining the timing misalignment between a channel under test and a deskew channel. Other channels within the plurality of channels are masked by transmitting a repeating masked bit pattern. This timing misalignment may be measured by comparing a segment within the channel under test to a corresponding segment within the deskew channel and identifying a time differential between the two segments. | 06-25-2009 |
20090316295 | METHOD OF SERVO WRITING, METHOD OF COMPENSATING PHASE MISMATCH OF SERVO PATTERN AND HARD DISK DRIVE ON WHICH THE METHODS ARE IMPLEMENTED - A method of servo writing for each track of a magnetic recording medium divided into a plurality of circular tracks including performing a phase adjustment operation by controlling a phase of a recording current according to a skew angle formed by a magnetic head and a track of the magnetic recording medium, and writing a servo pattern when the magnetic recording medium is magnetized using a magnetic head so as to have a magnetized pattern corresponding to a servo pattern. | 12-24-2009 |
20090316296 | SERVO CONTROL IN TAPE DRIVES - Servo control methods and apparatus for a tape drive. A read/write head reads and writes data on magnetic tape with at least one servo track providing transverse position information. At least two servo readers arranged for reading a servo track associated with the read/write head operate concurrently to generate servo read signals. A position estimator processes each servo read signal to generate a series of position values corresponding to respective time instants indicative of their transverse positions. A servo controller calculates a skew value indicative of tape skew relative to the read/write head and a tension variation value indicative of variation of tape tension. The servo controller is adapted to account for cross-coupling between tape skew and tension variation. | 12-24-2009 |
20100073807 | STORAGE DEVICE, HEAD POSITION DETECTION METHOD AND CONTROL CIRCUIT - According to one embodiment, a storage device includes an area demodulator and a head position demodulator. The area demodulator demodulates a first demodulation signal and a second demodulation signal having a phase difference of 90° from a read signal by a head of an area demodulation pattern recorded on a medium. The head position demodulator receives the first demodulation signal and the second demodulation signal, and outputs a phase angle indicating a direction of a vector formed in a phase plane by the first demodulation signal and the second demodulation signal as a head position signal. | 03-25-2010 |
20100103554 | MEDIA ACCESS METHOD AND MAGNETIC STORAGE APPARATUS - According to one embodiment, a media access method includes a head scanning each track of a magnetic recording medium while tilting with respect to a direction perpendicular to the track direction at all positions including a position with a skew angle of zero on the magnetic recording medium. The track includes at least one magnetic dot array. The core width of the head is set with respect to a pitch of magnetic dots in the track direction and a pitch in the direction perpendicular to the track direction so that the head does not simultaneously scan a plurality of magnetic dots while scanning one track. | 04-29-2010 |
20100315739 | APPARATUS AND METHOD TO ADJUST THE ORIENTATION OF A READ HEAD TO CORRECT FOR DYNAMIC SKEW - A method to adjust the orientation of a read head comprising a first read element and a second read element, wherein the first read element and the second read element are separated by a distance, wherein the method moves a sequential information storage medium adjacent to the read head, determines a skew angle for the sequential information storage medium with respect to the read head using the first read element and the second read element, and encodes that skew angle in a computer readable medium. | 12-16-2010 |
20110032636 | ENHANCED HEAD SKEW OPTIMIZATION FOR HIGH SPEED DISK ACCESS - A hard disk drive with multiple heads coupled to multiple disks. The disk drive switches between heads when writing or reading data to access different disk surfaces. As described above, there is a head skew time associated with switching heads. The disk drive includes a circuit that switches heads in accordance with a sequence that is a function of a head skew value. For example, the sequence may include switching from a first head to a third head and from a third head to a second head. | 02-10-2011 |
20120268842 | METHOD AND APPARATUS FOR OPERATING A STORAGE DEVICE - Method for operating a storage device with a tape and a head which is operable to read and/or write data from and respectively to the tape. The tape is moveable in a predetermined longitudinal direction. At least two consecutive current lateral tape positions of the tape with respect to a predetermined reference point are determined at a predetermined longitudinal capture position. A tape skew of the tape is determined dependent on the at least two determined lateral positions. The tape skew represents an angle between a current tape motion direction of the tape and the longitudinal direction. A skew control signal is determined dependent on the determined tape skew. A rotational head position of the head is controlled dependent on the skew control signal to align the head to the current tape motion direction in such a way that the head is operable to read and/or write data. | 10-25-2012 |
20130286502 | Two Dimensional Magnetic Sensor Immune to Skew Angle Misalignment - Apparatus for two dimensional data reading. In accordance with some embodiments, a magnetic read element has a plurality of read sensors positioned symmetrically about a pivot point with at least two of the read sensors configured to concurrently read two dimensional user data while being immune to skew angle misalignment. | 10-31-2013 |
20130335856 | Dynamic Track Pitch Control for Shingled Magnetic Recording (SMR) - SMR disk drives are described that adjust track pitch or magnetic write width to compensate for external temperature effects. In one embodiment track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined from the drives' temperature sensor. In other embodiments track pitch is adjusted based on the magnetic write width (MWW) which is determined from read-back testing of previously written data tracks. In an alternative embodiment, the width of the MWW is adjusted instead of the track pitch. The various factors that affect the MWW that can be used to increase or decrease the MWW, including write current characteristics and when available thermal-assistance parameters. | 12-19-2013 |
20140016226 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 01-16-2014 |
20140192437 | HEAD ROTATOR ASSEMBLY FOR TAPE DRIVE - A head rotator assembly ( | 07-10-2014 |
20140268408 | AZIMUTH ACTUATED DUAL DEVICE SET POSITIONING - A device for recording and/or reading data to and/or from a magnetic tape includes a read/write head which has a first device set including a first plurality of magnetic data write and/or read elements and a second device set including a second plurality of magnetic data write and/or read elements. The device also includes a lateral positioning actuator and an azimuth actuator. The lateral positioning actuator and azimuth actuator are used together to position both device sets on the magnetic tape. The lateral positioning actuator laterally positions the read/write head such that during write and/or read operations the first and second pluralities of magnetic data write and/or read elements align laterally to first and second pluralities of recordable and/or readable data tracks on the magnetic tape. The azimuth actuator rotates the read/write head about an azimuthal angle. such that the elements align to lateral spacings. | 09-18-2014 |
20140268409 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 09-18-2014 |
20140327987 | MAGNETIC HEAD AND SYSTEM HAVING OFFSET ARRAYS - In one general embodiment, an apparatus includes at least two modules, each of the modules having an array of transducers, wherein the at least two modules are fixed relative to each other, wherein an axis of each array is defined between opposite ends thereof, wherein the axes of the arrays are oriented about parallel to each other, wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross; and a mechanism for orienting the modules about an axis orthogonal to the plane in which the arrays reside to control a transducer pitch presented to a tape. | 11-06-2014 |
20140334033 | QUASI-STATICALLY ORIENTED HEAD FOR RECORDING NON-LEGACY FORMATS - Apparatuses are configured to addresses tape dimensional stability (TDS) via small rotations about the quasi-static tilt angle and read and/or write data in non-legacy formats. Products such as tape media products are also presented. | 11-13-2014 |
20150131180 | OPERATING A TAPE STORAGE DEVICE - An apparatus for operating a tape storage device comprises a first tape skew determination unit for providing a first tape skew value concerning a skew of a tape in the tape storage device, and a second tape skew determination unit for providing a second tape skew value concerning the skew of the tape. An actuator adjusts one or more of a rotational orientation of a tape head of the tape storage device which tape head is provided for reading and/or writing data from/to the tape, and a motion direction of the tape dependent on the first tape skew value and the second tape skew value. | 05-14-2015 |
20150302879 | MAGNETIC TAPE PROCESSING - A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70. | 10-22-2015 |
20150325262 | DEVICE AND METHOD FOR CONTROLLING THE POSITION OF A HEAD RELATIVE TO A TAPE WITHIN A TAPE TRANSPORT SYSTEM - Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES. | 11-12-2015 |
20160019921 | WRITE DELAY TO DE-SKEW DATA IN READ WHILE WRITE FUNCTION FOR TAPE STORAGE DEVICES - A controller, according to one embodiment, has at least some hardware components, and is configured to determine an offset between adjacent arrays of transducers in a direction perpendicular to an intended direction of media travel when a magnetic head having the arrays is positioned at a first position, cause the magnetic head to tilt to a second position, and delay write operations performed by at least some of the transducers in a first of the arrays such that data written by the transducers in the first array is readable by a second array of read transducers aligned in the direction orthogonal to the intended direction of media travel without implementing readback delays corresponding to the write delays. | 01-21-2016 |
20160254015 | TAPE RECORDING HEAD HAVING NON-PARALLEL GAPS AND DISSIMILAR TRANSDUCER PITCHES | 09-01-2016 |