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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....
7200546 Tape storage emulator  
A tape storage emulator provides response data corresponding to a tape storage device and receives a non-media command from a server. The response data is sent to the server in response to the...
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...
7072128 Methods for searching for SAM patterns at multiple nominal frequencies  
Methods are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. A servo address mark (SAM) pattern is searched for, within...
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...
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...
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...
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...
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...
6940430 Separation enhanced gray codes  
In general, in one aspect, the invention features a Gray code decoder for decoding input numbers according to a K-bit Gray code and a Gray code encoder for encoding input numbers according to the...
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...
6876316 Separation enhanced gray codes  
A method and computer program for generating a K-bit Gray code comprises (a) selecting a M-bit Gray code number from a M-bit Gray code having a one-bit separation I and a two-bit separation J; (b)...
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...
6857044 Data storage device for fast multiple file write operations  
A data storage device comprising a computer useable medium having computer readable program code disposed therein for writing information on a data storage medium using fast multiple file write...
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...
6839194 Disk drive apparatus and method for generating servo sector pulse  
A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a...
6813108 Servo data detection in presence of radial incoherence using multiple data detectors  
Techniques for detecting control data, such as servo data, from input or incoming data read from a magnetic recording medium in the presence of radial incoherence are provided. More specifically,...
6775081 Servo format for disk drive data storage devices  
A recording disk contains at least two types of servo sector format, including a first type having a relatively larger track identifying field containing the track number, and a second type having...
6754019 System and method for implementing a rotary memory device  
An improved system and method for implementing a rotary memory device, including a host system and a disk-shaped memory medium storing position information, or a servo address mark (SAM). If a head...
6732192 Disc recording scheme for enabling quick access to disc data  
A system for recording data to a disc shaped record medium. The data is recorded according to a universal disc format employing a hierarchical file system, and data within the hierarchical...
6694404 Method of identifying data with same time stamps on different tracks in storage device  
A data reader is arranged to read data comprising user data 30 and non-user data 32, 34 written across at least two channels of a data-holding medium 10 , said data being arranged into a...
6674591 Method and apparatus for identifying a track of a rotating disk using EPR4 data equalization and detection techniques  
According to a broad aspect of the invention, a method and apparatus are presented for identifying a track ( 42 ) of a rotating disk ( 12 ) of a mass data storage device ( 10 ), using EPR4 data...
6639748 Disk drive that discerns the polarity of a head signal from a sync mark to enhance data detection  
The present invention may be regarded as a disk drive comprising a disk having a plurality of data tracks, each data track comprising a plurality of sectors. A sync mark detector detects a sync...
6587291 Asynchronously sampling wide bi-phase codes  
Sampling data with wide bi-phase code symbols includes sampling a wide bi-phase code symbol in the data a number (N) of times to produce samples of data, selecting a subset of the samples,...
6556365 Storage media having a wide servo band and high data format efficiency and a storage using the same  
A servo control method for a storage media includes arranging a plurality of servo sectors along a circumferential direction of the disk-type storage medium without successively arranging the...
6539514 Read while write method in data storage device  
Data are simultaneously written to plural tracks of a magnetic tape storage device while preventing elongated tape scratches from corrupting data blocks. A byte stream of user data is arranged into...
6535463 Method and apparatus for high density recording of data on a disk, and recording medium produced thereby  
A recording medium comprising a data-recording surface is formed of plural tracks, with a respective track having a data section in which units of data are to be recorded. Only one header section...
6529341 Magnetic recording/reproduction device using preformat information  
A magnetic disk for a magnetic recording/reproduction device includes a magnetic head, wherein a magnetization bit-pattern corresponding to a preformat information signal is recorded beforehand on...
Matches 1 - 50 out of 317 1 2 3 4 5 6 7 >