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| Number | Title | Issue Date |
| 7006311 | Systems for preventing channel control values from being corrupted to thereby improve servo-demodulation robustness Systems are provided for improving servo-demodulation robustness. The SAM pattern is searched for in a servo wedge. If the SAM pattern is detected in the first servo wedge, a determination is made whether to characterize the detection of the SAM pattern as either a ... | 02/28/2006 |
| 7006312 | Methods for preventing channel control values from being corrupted to thereby improve servo-demodulation robustness Methods are provided for improving servo-demodulation robustness. A SAM pattern is searched for in a servo wedge. If the SAM pattern is detected in the first servo wedge, a determination is made whether to characterize the detection of the SAM pattern as either a go... | 02/28/2006 |
| 7003626 | Method for storing format specific data in a microcontroller execution memory Format specific parameters may be selected in a disk drive comprising a control system and a plurality of disk surfaces each having a surface format for storing data, wherein at least one surface format is different than other surface formats and wherein the control... | 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 |
| 7002765 | Smart retry operation A smart retry operation, or set of retry procedures to be performed in sequence, that optimizes itself for a data storage device's individual characteristics, including variations across the data storage media and variations introduced as the device degrades over ti... | 02/21/2006 |
| 7003689 | Disk storage apparatus for audio visual data and retry method employed therein upon occurrence of sector error A CPU computes a maximum allowable time period for restoration of a sector in which an error occurs, on the basis of a command processing time period designated by a host, when the error occurs upon access to the disk designated by a command supplied from the host, ... | 02/21/2006 |
| 7002770 | Methods for setting end-of-seek criteria for rotatable storage media In order to increase the performance and reliability of devices including rotatable storage media, individual characteristics of device elements or heads can be determined and used to set performance criteria. The off-track capability and track mis-registration of a... | 02/21/2006 |
| 7000171 | Recorded medium reproducing device and method, data output controlling method, data outputting method, error detecting method, and data outputting reproducing method A reproducing method for a record medium includes the steps of performing a demodulating process for data that have been read from a record medium on which content data have been recorded, management information and additional information being embedded in the conte... | 02/14/2006 |
| 6999386 | Drive, method for reading data, information recording medium reproduction apparatus, and method for reproducing data having reading errors A method for reading data from an information recording medium having a plurality of address regions, includes the steps of: performing a reading operation for all of designated address regions among the plurality of address regions while holding read error informat... | 02/14/2006 |
| 6999256 | Methods of measuring TPTP of magnetic head and controlling recording current A method of measuring the degree of thermal pole tip protrusion (TPTP) of a magnetic head and controlling a recording current in consideration of the degree of TPTP, in relation to a hard disk drive includes measuring the rate of errors contained in data by performi... | 02/14/2006 |
| 6999258 | Time-based servopositioning systems Servo positioning systems, methods, formats, and data recording media used in association with the same, employing additional timing reference information to improve immunity to time-based errors caused by instantaneous speed variations. ... | 02/14/2006 |
| 6995935 | Methods for detecting multiple occurrences of a SAM pattern to thereby improve servo-demodulation robustness Methods are provided for improving servo-demodulation robustness. Multiple occurrences of a SAM pattern are searched for in a single servo wedge. Each detection of the SAM pattern in the servo wedge is charactered as a good SAM detection or a bad SAM detection. If m... | 02/07/2006 |
| 6996740 | Method of optimizing design parameters of data storage system and method of applying optimized design parameters A method of optimizing design parameters of a data storage system in which a failure of products is caused by changes in the time required for using the products and characteristics of the products is pre-estimated. Design parameters used in a signal processing circ... | 02/07/2006 |
| 6995932 | Thermal asperity compensation in perpendicular recording system A detection circuit or a perpendicular recording system includes a channel circuit to amplify the read data signal. A transient detector generates a transient detect signal. A first path and a second path are coupled to an output of the channel circuit. The first pa... | 02/07/2006 |
| 6995936 | Information recording apparatus and information recording method An information recording apparatus for recording content information on an information recording medium includes a main information recording area on which main information to be reproduced is recorded, and a plurality of content information recording areas on which... | 02/07/2006 |
| 6995943 | Off-track error recovery method and apparatus for disk drive An off-track error recovery method and apparatus for a disk drive are disclosed herein. Off-track errors are either due to vibration of the disk drive or due to defective servo data stored on a disk surface of the disk drive. In order to tailor error recovery operat... | 02/07/2006 |
| 6996075 | Pre-testing and certification of multiple access codes A system, method and article of manufacture are provided for managing the transmission suitability of a channel in a multi access scheme. In general, information relating to noise associated with a channel is obtained. A potential effect of the noise on a transmissi... | 02/07/2006 |
| 6992851 | Method for nonsequentially writing reference spiral servo patterns to a disk to compensate for disk expansion A method is disclosed for reducing disk expansion effects while writing spiral reference patterns on a disk. The disk drive comprises control circuitry and a head disk assembly (HDA). In the method, an external spiral servo writer is used to control a radial locatio... | 01/31/2006 |
| 6993688 | Data sector error tracking and correction mechanism A method is provided for reducing growth errors in disc drive. First, a number of sectors to be read is determined. Data is then read from all sectors of the number of sectors on a disc during a first disc revolution. Next, error sectors having a number of errors ab... | 01/31/2006 |
| 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 values within desired ranges improves servo demodulation robustness.... | 01/31/2006 |
| 6993194 | Method and apparatus for detecting errors in image reading A method and apparatus used to detect errors in image reading simply and quickly. Information derived from image data (such as the amount of data and a compression ratio) after compression is compared with reference values previously determined in connection with er... | 01/31/2006 |
| 6993567 | Recording/reproducing apparatus, data reproducing method, and data recording/reproducing method Although music program data has been recorded on a disc, imperfect index data or a signal has been recorded so that music program data is prohibited from being reproduced. To allow music program data to be reproduced, the index data is rewritten to perfect index dat... | 01/31/2006 |
| 6993679 | System and method for inhibiting reads to non-guaranteed data in remapped portions of a storage medium Various embodiments of a method and system for inhibiting reads to non-guaranteed data in remapped portions of a storage medium are disclosed. In one embodiment, a method of managing a non-read list associated with a storage medium involves: detecting a bad portion ... | 01/31/2006 |
| 6993678 | Logical zone table generation process and apparatus A disc-drive system and method for generating logical zones that each have an approximate number of spare sectors, and that are used to translate logical block addresses. A disc drive includes a disc-drive housing and a disc assembly mounted to rotate within the hou... | 01/31/2006 |
| 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 values within desired ranges improves servo demodulation robustness.... | 01/31/2006 |
| 6987628 | Method and apparatus for high fly write detection using stored amplitude values A method and apparatus for detecting a high flying condition of a transducer head in a computer disk drive is provided. The method and apparatus allow the detection of high fly write events that occur over one or a small number of data sectors. In addition, the pres... | 01/17/2006 |
| 6982842 | Predictive disc drive failure methodology A method of performing predictive failure analysis (PFA) for a disc drive includes maintaining at least two primary error counts during operation of the disc drive. The primary error counts each correspond to disc drive errors associated with different attributes of... | 01/03/2006 |
| 6981118 | Storage control system For each of a plurality of storage devices, there is stored a response time required from when an input/output request sent from a host processor is received until when a processing result of the request is sent to the host processor. One or a plurality of response-... | 12/27/2005 |
| 6981205 | Data storage apparatus, read data processor, and read data processing method To improve the probability of error correction, thereby generating correct read data. Data is read from the same sector by a number of times and a majority decision is done in the same address, thereby the most frequently read value is regarded as the true data valu... | 12/27/2005 |
| 6980385 | Apparatus for information recording and reproducing In order to generate a sampling clock having a higher accuracy, a synchronous signal generating circuit is provided with a phase error detector, detecting a phase error of a read out signal digitized on the basis of FDTS algorithm, and a VCO, controlling an oscillat... | 12/27/2005 |
| 6978414 | Method and apparatus for protecting against errors occurring in data storage device buffers A linear tape data storage device comprises a read head and a write head; a tape transport mechanism for transporting the linear tape data storage medium across the read head and the write head, the device being operated according to a predefined tape format; a DRAM... | 12/20/2005 |
| 6977108 | Recording medium including patterned tracks and isolation regions A recording medium includes a substrate, and a recording layer formed on the substrate having (a) a recording track band, and (b) recording cells regularly arrayed in the recording track band to form a plurality rows of sub-tracks. The recording cells included in ea... | 12/20/2005 |
| 6977787 | Read processing method of storage medium, storage apparatus, data reproduction method, data reproduction system and storage medium therefor A read processing method and a reproduction system for continuously reading out an audio/visual data from a storage medium. When a data cannot be read out from storage medium, a data having a predetermined pattern is transferred so as to prevent operational deadlock... | 12/20/2005 |
| 6976196 | Error detecting method and device, information storing and reproducing device and magnetic disk drive In order to precisely detect latent defects where a data-synchronizing signal is to be stored despite changes in the rotation of an information storage medium, a region data detection is used during a defect detection mode that is longer in the back-and-forth direct... | 12/13/2005 |
| 6975467 | Method and apparatus for high fly write detection in a disk drive A method and apparatus for detecting a high fly write condition in a disk drive is disclosed. Amplitudes of automatic gain control (AGC) fields are used in connection with determining whether a high fly write condition exists in a disk drive, since the amplitude of ... | 12/13/2005 |
| 6975474 | Method and apparatus for read error recovery in a disk drive with a GMR read head A disk drive is disclosed which has a facility to perform a pinning reset operation on a GMR read element included in a head if a read retry operation fails to achieve recovery from a read error. When a bias and write currents are supplied to the head, a CPU of the ... | 12/13/2005 |
| 6975807 | Video tape recorder A video tape recorder includes a rotary cylinder of double-azimuth four-head structure having a pair of main heads and a pair of subheads. When it is detected base on an envelop signal that clogging or the like occurs in the pair of main heads, a controller performs... | 12/13/2005 |
| 6972919 | Increasing head-disk interface reliability using controlled heating A method for increasing reliability during a read and/or write operation in a disk drive having a head. Data is read from a disk using a head. An amplitude of a signal obtained during reading the data is measured. A degree of variation in the signal amplitude is det... | 12/06/2005 |
| 6970314 | Multiple section read/write head for high track density, flexible media storage applications The present invention divides the recording head into multiple sections, each section accessing a subset of the total number of channels arranged such that one section reads and writes only a subset of the data channels. The sections may be either independently actu... | 11/29/2005 |
| 6970310 | Disk control apparatus and its control method A disk system that conducts diagnoses of magnetic heads at regular or irregular interval to detect occurrence of unwritable failure. The history of regions on magnetic recording media where write operations took place is managed and a region where an unwritable fail... | 11/29/2005 |
