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| Application No. | Application Title | Issue Date |
| 20110292535 | METHODS AND APPARATUS FOR SYNCHRONIZATION MARK DETECTION BASED ON A POSITION OF AN EXTREME DISTANCE METRIC Methods and apparatus are provided for detection of a synchronization mark based on a position of an extreme distance metric. A synchronization mark is detected in a received signal by computing a distance metric between the received signal and an ideal version of the r... | 12/01/2011 |
| 20110286126 | METHOD OF MAKING A MULTI-CHANNEL TIME BASED SERVO TAPE MEDIA A thin film magnetic recording head is fabricated by forming a substrate from opposing ferrite blocks which have a ceramic member bonded between them. This structure is then diced to form a plurality of columns, wherein each column has a ferrite/ceramic combination. Eac... | 11/24/2011 |
| 20110249355 | METHOD AND SYSTEM FOR ERROR CHECKING IN BIT-PATTERNED MEDIA A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being... | 10/13/2011 |
| 20110216434 | TIMING ALTERNATIVE INTERVALS WITHIN A TIMING BASED SERVO BAND An alternative time interval is taken of a timing based servo band to determine lateral position of a servo read head. The servo band is arranged in a sequence bursts with non-parallel servo stripes in sequentially adjacent sub-frames of a linear tape. The timing interv... | 09/08/2011 |
| 20110205657 | SYNCHRONIZATION OF SYMMETRIC TIMING BASED SERVO BURSTS Timing based servo bursts of servo frames, in which the frames are arranged to be symmetric with the same number of servo stripes in each burst of a frame, are synchronized by shifting selected bits. For example, servo frames are arranged with four servo bursts with an ... | 08/25/2011 |
| 20110188145 | SERVO TRACK WRITER AND OPERATING METHOD A method of operating a servo track writer includes writing a clock pattern signal to a magnetic recording medium of a head disk assembly, reading the clock pattern signal written to the magnetic recording medium and dividing a frequency of a read clock pattern signal, ... | 08/04/2011 |
| 20110102929 | DISK DRIVE AND METHOD OF TIMING CONTROL FOR SERVO-DATA DETECTION A method of timing control for servo-data detection in a disk drive. The method includes retrieving a plurality of servo sectors arranged discretely in a circumferential direction of a disk and measuring time intervals between servo sectors. The method also includes det... | 05/05/2011 |
| 20110038073 | Using Readback Signals to Estimate Radial Location on a Rotating Storage Device Approaches for estimating the operating radius of a head in a hard-disk drive. These approaches may be used in a constant or approximately constant density servo scheme. Statistics, which describe the proportion of high frequency values to low frequency values in a read... | 02/17/2011 |
| 20110032632 | TIMING RECOVERY DETECTOR A timing detector adapted for timing recovery on a read-channel is disclosed to improve signal quality of an input signal and maintain a small loop latency. The timing detector selects bits within the input signal that are high quality for timing recovery and discards b... | 02/10/2011 |
| 20100328804 | MAGNETIC DISK STORAGE DEVICE AND METHOD CONTROLLING OF MAGNETIC DISK STORAGE DEVICE According to one embodiment, a magnetic disk storage device includes a magnetic disk, a head, a clock generator, an estimating module, and a controller. The magnetic disk includes a servo area and a corresponding data area, and has a surface divided into zones in the ra... | 12/30/2010 |
| 20100302669 | TRANSDUCER DESIGN WITH A SENSOR CLOSE TO WRITE POLE A magnetic device includes a read sensor, a writer and a synchronization sensor. The magnetic device is configured for writing information to and reading information from a magnetic medium that includes a plurality of discrete magnetic bits. The writer includes a write ... | 12/02/2010 |
| 20100259845 | THERMALLY-ASSISTED MAGNETIC RECORDING HEAD AND THERMALLY-ASSISTED MAGNETIC RECORDING METHOD A head capable of favorite thermally-assisted magnetic recording without depending on the use of a near-field light generator is provided. The head comprises a write head element formed on the trailing side from a waveguide and comprising a first main pole. The first ma... | 10/14/2010 |
| 20100238578 | METHOD FOR GENERATING WRITE CLOCK SIGNAL IN MAGNETIC DISK DRIVE According to one embodiment, a write clock generator writes data to bits in a magnetic recording medium based on a write clock signal with a phase obtained by delaying the phase of a reference write clock signal. The write clock generator detects the amplitude of a read... | 09/23/2010 |
| 20100238577 | METHOD AND APPARATUS FOR MEASURING PHASE SHIFT IN A DISK DRIVE HAVING BIT-PATTERNED MEDIA According to one embodiment, a disk drive comprising a magnetic disk of bit-patterned type is provided. The disk drive has a reproduction module, a measurement module, and a recording module. The reproduction module outputs a reproduced signal corresponding to the phase... | 09/23/2010 |
| 20100202079 | WRITE SYNCHRONIZATION PHASE CALIBRATION FOR STORAGE MEDIA A technique is described for write synchronization phase calibration for storage media (e.g., bit patterned media). In one embodiment, a calibration write clock signal may be generated at a frequency offset from a nominal dot frequency of a bit patterned storage media. ... | 08/12/2010 |
| 20100157459 | Systems and Methods for Controlling Data Equalization Various embodiments of the present invention provide systems and methods for performing data equalization. For example, various embodiments of the present invention provide data equalization circuits that include an equalization circuit and a transition adjustment circu... | 06/24/2010 |
| 20100149675 | Skip Block Writing For Bit Patterned Media Write Synchronization A method for synchronizing writing to a bit patterned media includes: reading bits from skipped blocks on the bit patterned media, using timing of bits read from the skipped blocks to update a write clock, and writing request data to physical blocks on the bit patterned... | 06/17/2010 |
| 20100142078 | Systems and Methods for Memory Efficient Repeatable Run Out Processing Various embodiments of the present invention provide systems and methods for low overhead disk wobble compensation. As an example, a method for performing synchronous wobble compensation processing is disclosed. The method includes providing a medium that includes a ser... | 06/10/2010 |
| 20100134913 | FREQUENCY CONTROL APPARATUS AND STORAGE DEVICE According to one embodiment, a frequency control apparatus includes an eccentric component storage module, a frequency correction amount calculating module, and an oscillator control module. The eccentric component storage module stores in advance an eccentric component... | 06/03/2010 |
| 20100118428 | INTERSPERSED PHASE-LOCKED LOOP FIELDS FOR DATA STORAGE MEDIA SYNCHRONIZATION Techniques are described for providing media-referenced timing for operations on a data storage medium. In particular, Phase-Locked Loop (PLL) synchronization fields may be interspersed within data fields of the medium and may be read to obtain timing measurements. The ... | 05/13/2010 |
| 20100118429 | REDUCED READ/WRITE TRANSITION OVERHEAD FOR STORAGE MEDIA A technique is described for reducing overhead in a magnetic medium utilizing interspersed timing synchronization fields. In particular, a reader reads timing synchronization fields interspersed within data fields of the medium to obtain timing measurements. The reader ... | 05/13/2010 |
| 20100118427 | ELIMINATING SECTOR SYNCHRONIZATION FIELDS FOR BIT PATTERNED MEDIA Clock synchronization techniques are described for data storage media, particularly for the tolerances of efficient use of bit patterned media (BPM) capacity. In particular, techniques are described where position of a read-write head and timing of a write and/or read c... | 05/13/2010 |
| 20100118426 | WRITE CLOCK CONTROL SYSTEM FOR MEDIA PATTERN WRITE SYNCHRONIZATION A write clock control system comprises a clock controller that determines a phase offset based on a phase difference between a write clock signal and a media pattern corresponding to a given timing synchronization field being read, and a phase interpolator that produces... | 05/13/2010 |
| 20100110574 | TESTING STORAGE SYSTEM ELECTRONICS USING LOOPBACK A system includes a hard disk controller module configured to control a hard disk. A read channel device is in communication with the hard disk controller module via a read bus and a write bus. The read channel device includes a loopback circuit configured to selectivel... | 05/06/2010 |
| 20100110573 | SYNCHRONOUS WRITING WITH TIMING ERROR DETECTION IN BIT PATTERNED MEDIA DISK DRIVES A hard disk drive that includes a head that is coupled to a disk. The disk drive further includes a comparator circuit that is coupled to the head. The comparator circuit receives a synchronization signal and a write clock. The comparator generates a write error signal ... | 05/06/2010 |
| 20100079891 | TRACK-ADAPTED DATA CLOCKING A method for writing data to a tape at multiple rates for simultaneously creating data tracks having differing linear data densities, according to one embodiment, includes passing a tape over a head, the head having an array of writers thereon; receiving incoming data; ... | 04/01/2010 |
| 20100073801 | MAGNETIC RECORDING DEVICE, CONTROL DEVICE, AND MAGNETIC RECORDING DEVICE CONTROL METHOD A magnetic recording device includes: a magnetic recording medium including a write-synchronization region and a data region; a correction-value-storage unit configured to store therein a phase-correction value for correcting a phase of the write clock; a reading unit c... | 03/25/2010 |
| 20100073800 | RECOVERING SERVO INFORMATION FROM A SYNCHRONOUS SERVO CHANNEL Provided are a method, servo channel, and tape drive for recovering servo information from a synchronous servo channel. An interpolator reads samples of a servo signal obtained from a servo reader at a rate of one servo sample per clock interval, to produce up to M inte... | 03/25/2010 |
| 20100020429 | Converting Timing Errors Into Symbol Errors to Handle Write Mis-Synchronization in Bit-Patterned Media Recording Systems A method includes: writing data to a bit-patterned media at times determined by a clock having a period that is offset from a bit island period by a fixed offset to create one insertion or one deletion approximately within a predetermined number of bit islands, reading ... | 01/28/2010 |
| 20090296255 | PHASE ADJUSTING DEVICE, MAGNETIC STORAGE MEDIUM, AND STORAGE DEVICE A magnetic storage medium such as a BPM includes a plurality of magnetic dots for writing and reproducing data disposed in a magnetically separated manner so as to be spaced a predetermined distance in a down-track direction and a plurality of tracks concentrically disp... | 12/03/2009 |
| 20090268331 | HARD DISK DRIVE AND SERVO TRACK WRITING SYSTEM FOR THE SAME A hard disk drive includes a housing including a base member and a cover member, a spindle motor disposed in the housing, a data storage disk disposed on the spindle motor, an actuator disposed in the housing to move a read/write head to a position on the data storage d... | 10/29/2009 |
| 20090244760 | MAGNETIC STORAGE CONTROL APPARATUS, MAGNETIC STORAGE CONTROL METHOD, AND MAGNETIC STORAGE APPARATUS A magnetic storage control apparatus for controlling a magnetic storage apparatus that uses a recording medium having a plurality of reference signals on its track and having a data area between the reference signals. The apparatus includes: a measurement section that r... | 10/01/2009 |
| 20090237826 | DATA STORAGE APPARATUS A data storage apparatus includes: a medium for storing data including sectors, each of the sectors including a synchronization mark indicating the data start position in each of the sectors; a memory for storing types of synchronization marks stored in the sectors; and... | 09/24/2009 |
| 20090195911 | MAGNETIC RECORDING DEVICE A magnetic recording device includes a patterned media magnetic recording medium where multiple tracks are arranged for radial direction in a concentric manner, the tracks each being formed by arranging multiple recording dots. The recording dots are each made of an iso... | 08/06/2009 |
| 20090168218 | DISK DRIVE DEVICE AND SERVO WRITE METHOD According to one embodiment, a servo write module is configured to write radial servo patterns on the disk media using a first spiral servo pattern of the spiral servo patterns as a base pattern for tracing, to detect a shift amount of a sync mark position in each of ot... | 07/02/2009 |
| 20090109564 | Low-power read channel for magnetic mass storage systems An improved mass storage system having a read channel adapted to store in a FIFO memory digitized analog samples of data symbols read from a disk, the buffered digitized samples being processed by digital circuitry that may be operated at a slower speed than the maximum... | 04/30/2009 |
| 20090091854 | Write timing system for hard disk drives with bit patterned media A hard disk drive with a patterned disk that has a plurality of data fields. Each data field includes a sync field and a plurality of sync marks. Data is written onto the patterned disk in accordance with a write clock. The write clock is generated and synchronized by t... | 04/09/2009 |
| 20090080101 | SIGNAL GENERATOR WITH ADJUSTABLE FREQUENCY Frequency of an oscillating signal is temporarily adjusted to adjust frequency and/or phase of an output signal. For example, the frequency of the oscillating signal may be adjusted for a very short period of time to adjust the phase of the output signal. In addition, t... | 03/26/2009 |
| 20090052075 | Systems and Methods for Improved Synchronization Between an Asynchronously Detected Signal and a Synchronous Operation Various embodiments of the present invention provide systems and methods for synchronizing data processing. As one example, a method for synchronizing data processing is disclosed that includes receiving a data input, and sampling the data input at a sample period to ge... | 02/26/2009 |
| 20090002868 | Read after write enhancement for bit patterned media A read/write head for use with bit-patterned media detects write synchronization errors between a write clock and the bit-patterned media. In particular, the read/write head writes data to the bit-patterned media using a write clock. The data is then read from the bit-p... | 01/01/2009 |
