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8107179 Magnetic disk drive, servo writer, self-servo writer and methods for use therewith  
A servo writer includes a servo data generation module that generates servo data corresponding to a plurality of servo wedges and a plurality of tracks of a disk, the servo data including track...
8097351 Magnetic recording apparatus  
A magnetic recording apparatus has a magnetic recording media including a substrate and a magnetic layer containing magnetic patterns on the substrate, the magnetic layer including data zones to...
8094398 Arrangement method of servo pattern of patterned medium, patterned medium, and information storage device  
According to one embodiment, address information is expanded on a bit map in order to generate original address information which is divided in a direction of the abscissa to form groups. The...
8014095 Mixed format disk drive  
A magnetic disk for a hard disk drive comprising a plurality of physical sector sizes is disclosed. The magnetic disk includes a first sector size area physically formatted according to a first...
7968823 Wireless inductive coupling assembly for a heated glass panel  
A wireless inductive coupling assembly for a heated glass panel assembly is provided that includes a metal oxide coated glass panel with a panel frame, an opening frame that cooperates with the...
7920354 Phase servo patterns for bit patterned media  
A recordable medium according to some embodiments includes a servo control field having a bit patterned media (BPM) pattern. The pattern includes a plurality of isolated magnetic islands or dots...
7907362 Magnetic disk controller and method  
Among other disclosed subject matter, a magnetic disk controller can include an index detecting unit to detect an index of the magnetic disk, an error check code generating unit to, after the index...
7800853 Correcting servo sectors in a disk drive  
A disk drive is disclosed comprising a disk having a plurality of data tracks defined by a plurality of servo sectors, wherein each servo sector comprises a Gray coded address representing at least...
7768735 Angular and radial location determination in a control system  
In accordance with various embodiments, an angular location of a first servo field along an annular track is determined in relation to a difference between a first code value of the first servo...
7724464 Recording disk and disk drive  
Embodiments of the present invention provide a recording disk capable of curtailing the amount of servo data to be stored thereon, and a disk drive. According to one embodiment, servo data area...
7710676 Disk drive comprising gray code implemented with servo bursts  
A disk drive is disclosed comprising a disk including a plurality of servo tracks defined by a plurality of servo sectors, wherein each servo sector comprises a plurality of servo bursts. The disk...
7701655 Servo signal recording method, servo signal recording apparatus, and magnetic recording medium  
The present invention is a servo signal recording method for recording a servo signal on a magnetic tape having a data band and a servo band, wherein erasure is performed based on a pulse having a...
7667910 Magnetic disk drive, servo writer, self-servo writer and methods for use therewith  
A servo writer includes a servo data generation module that generates servo data corresponding to a plurality of servo wedges and a plurality of tracks of a disk, the servo data including burst...
7663830 Method of forming servo data of HDD and self servo write method using the same  
A method of forming servo data, and a self-servo write method using the same, the method including partial response maximum likelihood (PRML)-coding servo data into m bits in n-bit units;...
7605992 Robust LPOS detection with predictor and bit verifier  
A tape drive system which includes the ability to reliably reproduce LPOS information even if both of the servo channels of the tape drive system could not detect the LPOS information due to...
7542223 Magnetic disk drive using load/unload area for data storage  
Embodiments of the invention provide ways to write data in a load/unload area. In one embodiment, address numbers (ranging from 981 to 1065) whose order of addressing by host equipment is later...
7538965 Method and apparatus for writing servo management information in a disk drive  
According to one embodiment, in a disk drive having a disk medium on which servo data is recorded, servo-write management information is recorded on the disk medium, in the form of binary data...
7508610 Method and apparatus for recording servo frame, storage disk, and method and apparatus for obtaining servo frame information  
A servo-frame recording apparatus includes: a sector information rearranging section for rearranging serial bits of the sector information that is binary data; a first ExOR section for performing...
7398006 Disc access processor processing a result of accessing a disc and method thereof  
Prior to recording, a difference between a disc's temporal, maximum recordable length and a temporal length having been consumed by recording data is calculated. A scale is determined to allow a...
7394606 Information storage device and write control circuit  
On writing information to an information recording medium including multiple recording areas having logical addresses assigned thereto, each of the recording areas having information recorded...
7369343 Disk drive correcting track address during a write operation  
A disk drive is disclosed comprising a head actuated over a disk having a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors and each servo sector comprises...
7359848 Tape storage emulator  
A tape storage emulator has a disk storage, a tape storage, a server interface, a data path control, a virtual tape management and a personality logic. The server interface is in communications...
7330321 Reference magnetic signal recording device and method of manufacturing the same  
A method of simultaneously recording multiple reference magnetic signals by using a magnetic head having multiple recording portions is provided. A writing yoke formed of a ferromagnetic material...
7242546 Determining a location based on a cyclic bit sequence containing consecutively-placed identical bit-groups  
A location within a cycle is determined by reading a portion of a cyclic bit sequence, the bit sequence containing several interspersed bit-group sets that each contain a plurality of series that...
7227710 Method for operating disk drive having improved timing marks  
A method for operating a disk drive having timing marks (TMs) on the disk that are chosen to reduce the probability of misidentification of a TM in the presence of read errors. The disk drive...
7206148 Variable frequency chevron in printed media reference pattern to improve servo demodulation  
Reference patterns in accordance with the present invention can include variable frequency chevrons incorporated into a reference pattern on a printed media surface to improve servo demodulation....
7154688 Disk device having a function to confirm that a selected head is proper for a disk surface  
In a disk device in which heads are positioned by a servo mechanism, the object of the present invention is to prevent data from being destroyed by incorrect selection of a head and to improve...
7142382 Phase adjustment circuit and demodulation circuit  
A phase adjustment circuit includes: a carrier-wave-delay adjusting circuit for delaying an input carrier wave and outputting the delayed carrier wave, in accordance with phase information; and a...
7133600 Video recording system utilizing storage redundancy to transfer non-time-critical, error-intolerant data segments while transferring time-critical, error-tolerant streaming data segments at a required data transfer rate  
The present invention may be regarded as a video recording system and method of transferring a non-time-critical, error-intolerant data segment stored on a disk drive, which is responsive to a set...
7126775 Servo track address channel code for d=1 magnetic recording  
A rate ½, d=1 channel code encodes a Gray code servo track address into channel data recorded on a magnetic disk; a d=1 Viterbi sequence detector detects the recorded servo track address upon read ...
7099095 Track identification codewords having multiple bit error correction capability and generalized gray code property  
The present invention may be embodied in a disk drive comprising a rotating magnetic media having tracks identified by binary codewords, and in a related method. Each track codeword for a...
7054083 Systems for searching for SAM patterns at multiple nominal frequencies  
Systems are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. The systems include a first servo demodulator adapted to...
7050249 System and method for processing track identification data in a disk drive  
A system and method for processing track identification data in a disk drive having concentric tracks each having a track identification field (TIF) stored in embedded servo sectors, the TIF...
7050250 Storage apparatus and storage medium  
There are provided a storage apparatus and a computer-readable recording medium, on whose storage areas, servo frames are arranged at uniform intervals in a spoke-like pattern. Each of the servo...
7042666 Disk drive having improved timing marks  
A disk drive has timing marks (TMs) on the disk, that are chosen to reduce the probability of misidentification of a TM in the presence of read errors. The disk drive searches for TMs within a...
7031085 Version tracking of disk write operations  
The present invention is a disc drive storage unit incorporating novel apparatus, data structure and method for uniquely identifying data written during each write command operation of the disc...
7026965 Separation enhanced Gray codes  
A Gray code decoder for decoding input numbers includes a first select circuit that selects an M-bit Gray code number from a M-bit Gray code having a one-bit separation I and a two-bit separation...
7023639 Servo synchronization validation techniques based on both servo synch marks and wedge identifiers in a rotating media storage device  
Disclosed is a rotatable media storage device (RMSD) connectable to a host. The RMSD include a movable head to perform track following, a disk, and a synch mark detection circuit. The disk includes...
6999259 Master disc and method of manufacturing the same  
Magnetic transfer can be performed with high reliability by shortening the magnetic transit interval of servo address information, that is, a section in which “0” or “1” continues. An area for reg...
6992856 Systems for limiting channel control values to thereby improve servo-demodulation robustness  
Systems are provided for limiting channel control values, such as servo automatic gain control (AGC) values and/or servo phase lock loop (PLL) values, within respective desired ranges. Keeping such...
6992855 Methods for limiting channel control values to thereby improve servo-demodulation robustness  
Methods are provided for limiting channel control values, such as servo automatic gain control (AGC) values and/or servo phase lock loop (PLL) values, within respective desired ranges. Keeping such...
6985320 Method and apparatus for encoding data to guarantee isolated transitions in a magnetic recording system  
Provided is a method, system, and program for storing input groups of uncoded binary data on a storage medium. A plurality of uncoded data blocks in a data stream are received. An encoded data...
6947233 Disk drive apparatus and method for compensating for error in servo-information-recorded position between heads  
In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon...
6943981 Methods for improving servo-demodulation robustness  
Methods are provided for improving servo-demodulation robustness. SAM pattern detections are characterized as either good SAM detections or bad SAM detections. Further servo functions are then...
6937413 Tape servo information with superimposed data information providing servo band identification  
In magnetic tape having separate longitudinal servo bands of servo information with superimposed data information, the separate servo bands have selected different superimposed data information, to...
6920003 Data storage reading device and method  
A processor processes data read from plural data tracks on a data-containing medium. The data tracks include markers. The processor determines if markers are detected in a predetermined number of...
6903887 Multiple level (ML), integrated sector format (ISF), error correction code (ECC) encoding and decoding processes for data storage or communication devices and systems  
A method and an apparatus encodes and decodes blocks having a predetermined number of sectors of data bytes to detect and correct data bytes in error in each sector of a block. The method and the...
6898044 Method for calculating a format specific parameter in a disk drive having differing surface formats  
A method is disclosed for selecting format specific parameters in a disk drive comprising a control system and a plurality of disk surfaces each having a surface format for storing data, wherein at...
6862149 Searching for append point in data storage device  
There is disclosed a method of accurately locating an append point along a length of linear tape data storage medium, comprising entering a search mode searching for an absolute code word quad set...
6856480 Phase tolerant servo gray code detector  
Methods and apparatus are disclosed for detecting PR4 equalized Gray codes, providing phase tolerant Gray codes and detection thereof. A Gray code detector is provided, which receives a PR4...
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