263 results about "Write strategy" patented technology

In an optical disc in/from which data is recorded or reproduced by irradiating a storage area on the optical disc with a laser, information containing recording velocity information (RVI) for recording/reproduction, which represents a linear velocity different from the standard linear velocity, and write strategy information (WSI) corresponding to the recording velocity information is stored in a land pre-pit or the like on the optical disc.

In a recordable optical disc apparatus, the efficiency of the work necessary for optimizing the write pulse condition (write strategy) is improved and the read compatibility among drive units is ensured by a minimum addition of circuitry. An edge shift amount or a read signal and a binarized result are stored in an external memory as digital data and are later processed by analysis software in a host PC. The write pulse shape and power conditions can be optimized to individual optical disc media in a short time by means of a simple circuit. Further, by optimizing the write pulse shape and power condition in view of the PRML class or the difference in NA of the head, any deterioration of read compatibility can be avoided.

A high-speed optical disc recording apparatus includes a laser diode for generating multi-pulse light pulses and a photodiode outputting a measured power of the light pulses. An NRZI pattern encoder generates a predetermined power control pattern causing a write strategy generator to generate write strategy to a laser diode driver such that the laser diode outputs a multi-pulse having a fixed-duty ratio with two power levels. The measured power is averaged with a low-pass filter, is sampled and held, and is calibrated according to the fixed-duty ratio. The calibrated held average output of the measured power of the light pulses is compared with predetermined present levels to control the laser diode driver output voltage.

The invention provides a solid state disk (SSD) controller based on a write buffer detector, an addressing method of written data and an optional parallel channel write method, which achieve accurate judgment on address characteristics of data, respectivelycache continuous address data and random address data, write different write strategies according to different data types, and improve write speed of random data. The write buffer detector comprises an address subtractor, a continuous data buffer and a random data buffer, wherein the address subtractor is used for conducting subtraction on current page addresses and previous page addresses and comprises a previous page address register and a current page address register, the previous page address register is used for storing data and addresses at the previous page, and the current page address register is used for storing data and addresses at the current page; the size of the continuous data buffer is set to be a parameter Sequential-Buffer-Size, the continuous data buffer is used for caching data which is probably judged to be continuous access data, and data in the continuous data buffer is judged to be continuous data if the length of data in the continuous data buffer reaches the set parameter; and the random data buffer is used for caching random access data.

The invention provides a hybrid memory system which comprises a random storage medium and a non-volatile storage medium. Address encoding is carried out by adopting a unified encoding mode; the non-volatile storage medium is used for storing original data; the random storage medium comprises a write cache unit which is used for mirror image cache of the non-volatile storage medium; and the hybrid memory system also comprises a data index unit for indexing data of the write cache unit, a data check unit for comparing and checking the read or written data and the data stored in the write cache unit, and a data migration unit. The invention further provides a corresponding management method of the hybrid memory system. Through the system and the method, the random storage medium and the non-volatile storage medium exert respective advantages at the same time, a high-efficiency read-write strategy and a data migration mechanism can be achieved, and meanwhile, the read-write reliability can be ensured.

Methods and system are provided that enable unique write strategies to be selected without having to provide custom chips. Specific embodiments allow a user to specify which combinations, of total possible combinations, of space-to-mark lengths and mark-to-space lengths can have unique timing parameters defined in a portion of timing memory dedicated to storing space-to-mark and mark-to-space timing parameters, where unique timing parameters are defined for less than the total possible combinations of space-to-mark lengths and mark-to-space lengths. Embodiments also allow a user to select among different combination of timing mode and modulation code.

The present invention relates to an optical disk device for recording or reproducing information on or from an optical information recording medium by forming marks and spaces. The device includes a jitter value measurement unit, a measurement unit, measured value memory, theoretical length memory, a deviation value calculation unit, a flexibility amount calculation unit, a correction value calculation unit, and a jitter value calculation unit. The measurement unit measures the lengths of marks and spaces using a varied reference write strategy. The deviation value calculation unit calculates the deviation values of the marks and the spaces. The flexibility amount calculation unit calculates the amounts of intrinsic flexibility of all marks and spaces. The correction value calculation unit calculates a correction value for the reference write strategy. The jitter value calculation unit calculates a jitter value.

An optical drive writes information to an optical medium by obtaining a write strategy for the optical medium from a source external to the optical drive. A write module in the optical drive reads an optical medium identification code from the optical medium and determines that the write strategy for the optical medium is unavailable from an optical drive write strategy table. The write module communicates a request for a write strategy associated with the optical medium identification code read from the optical medium to a host information handling system which obtains the requested write strategy for the optical drive from a host write strategy table or a network location. Periodic updates from the network to the host information handling system and from the host information handling system to optical drive firmware aid in maintaining the optical drive's write strategy list up to date.

The invention provides a non-write-back mirror image and direct write switching method for a cache mirror image system. The method includes: setting a double-controller storage system. The double-controller storage system at least comprises two controllers. Each controller supports mirror image cache, write mirror image and direct write modes, supports write mirror image mode and direct write mode switching, and does not support a write back mode. When the double controllers are at the write mirror image mode, when one of the controllers fails, backup data can be obtained from the other controller, and data reliability can be guaranteed. When only one control is remained, and the survived controller can be perform write mirror image mode and direct write mode switching. Compared with the prior art, the method high in practicality has the advantages that the write-back mode is abandoned through switching of write mirror image and direct write strategies, disk failure can be avoided, and reliability of the storage system can be guaranteed.

An optical information storage medium according to the present invention has at least one information storage layer. The optical information storage medium has a management area that stores at least one unit containing control information about the optical information storage medium. The control information includes a format number, which provides information about at least a write strategy type and a write pre-compensation type, and a write strategy parameter, which provides information about the magnitude of shift in an edge position, or variation in the pulse width, of a write pulse train to form a recording mark. And the value of the format number changes according to a combination of the write strategy type and the write pre-compensation type.

Optical medium identification codes, such as the ATIP start codes used for CD-R optical media, are preassigned by optical medium manufacturer for association with planned optical media of the manufacturer. Optical disc drive manufacturers build optical disc drives having the preassigned optical medium identification codes in write strategy tables even though the optical disc drives are manufactured and sold before release and development of write strategies for the planned optical media. General write strategies associated with the preassigned optical medium identification codes provide more rapid write speeds for optical media having preassigned codes than for optical media having unknown identification codes by basing the preassigned write strategies on planned optical media design parameters, such as similarities with existing optical media of the manufacturer.

An optical disk recording apparatus is designed for forming pits on a recording surface of an optical disk of a given type at a given recording speed by applying a laser light in the form of a sequence of multiple pulses obtained by intermittently turning on and off the laser light according to a given multi-pulse pattern. In the apparatus, a write strategy circuit is set with a pattern table and controls the turning on and off of the laser light according to a multi-pulse pattern selected from the pattern table in correspondence to a length of the pit to be formed. A storage section stores a plurality of pattern tables of different kinds, each pattern table containing a plurality of multi-pulse patterns corresponding to a plurality of lengths of the pit. A control section selects one of the pattern tables based on either of the recording speed and the type of the optical disk, and reads out the selected pattern table from the storage section and sets the read pattern table in the write strategy circuit.

A write strategy circuit (recording pulse generator) generates a recording pulse for controlling a laser output applied to an optical disc using data modulated by a DVD encoder or a CD encoder. A delay circuit (220) delays delay subject signals S1 to S4 by a predetermined amount to generate delay signals D1 to D4. A delay amount for the delay circuit (220) is controlled by a delay amount control circuit (210). A logic circuit (300) generates a recording pulse by logically synthesizing the delay signals D1 to D4. The delay amount control circuit includes a voltage controlled oscillator formed by connecting, in a ring-like manner, a plurality of delay elements (211a) having the same configuration as the delay elements (221) included in the delay circuit. An output signal of the voltage controlled oscillator is locked at a point where a delay amount for each delay element (211a) becomes a fraction of an integer of one cycle of a reference clock signal.

The present invention relates, in general, to an optical pickup and apparatus for recording and reproducing information on and from an optical recording medium, such as a compact disk or a digital versatile disk and, more particularly, to an optical pickup device, which improves a write quality while reducing efforts to set write strategies at the time of designing a pickup drive.

A method for optimizing write parameters of an optical storage medium is provided. The method is adapted for a recording device using the optical storage medium. The method includes loading the optical storage medium having a test area into the recording device, determining a combination of an original write strategy and an original write power according to the optical storage medium, writing test data into the test area with the combination of the original write strategy and the original write power for dynamically adjusting the combination of the original write strategy and the original write power to obtain a combination of an optimal write strategy and an optimal write power, and writing data into the optical storage medium with the combination of the optimal write strategy and the optimal write power.

The present invention provides a quantitative backtest and quantitative trading method and device, storage medium, equipment and system based on graphical programming. The method includes: pre-defining containers, displays, logical connectors, functions, and operators; writing strategy codes in In multiple containers, connect the container and the display through a logical connector, convert it into a flow chart and output it; count the market cycle of each container, and obtain the amount of data required for strategy backtesting; load the required market cycle data into the computer memory ; Classify the strategies according to the market cycle and sort them according to the size of the data; conduct parallel backtests on the strategies of the same market cycle with similar data volumes; obtain the current market for real trading. The quantitative backtesting and quantitative trading scheme based on graphical programming in the present invention facilitates users to write strategy codes, and can perform quantitative backtesting and trading on a graphical programming interface, providing users with the convenience of strategy writing, backtesting, and trading.

A write signal control circuit in an optical disk drive for adjusting the duty cycle of the write signals by a duty cycle adjusting unit. The write signal control circuit includes a write signal generator for converting an EFM signal into the write signals according to the write strategy waveform generating rules, a duty cycle adjusting unit for adjusting the duty cycle of each write signal according to adjusting parameters and for outputting adjusted write signals, and a duty cycle detector for detecting the duty cycle of each adjusted write signal and outputting a respective duty cycle control signal. The duty cycle adjusting unit further receives the duty cycle control signal to adapt the adjusting parameters.

In order to meet the requirement for enhancing the speed of an optical disk apparatus, it is necessary to have a write strategy for compensating thermal interference during recording at high speed on a high-density optical disk such as BD. However, there has been no known technology for such a write strategy. By shifting the start position and the end position of a recording pulse in accordance with the preceding mark length, the preceding space length, the recording mark length, and the following space length, excellent jitter values have been obtained. Further, by simplifying parameters when the preceding pattern contains the shortest mark and the shortest space which cause large thermal interference, 12× BD recording can be achieved with the number of parameters smaller than double the number of parameters of the conventional 4×4 type write strategy.

A data processing system has a single configurable write buffer within a peripheral interface unit that is shared among multiple peripherals. Configuration registers are dynamically programmed to control criteria for determining whether control of a system bus will be released prior to completion of a write access to a peripheral. The criteria include which peripheral is being accessed, the particular bus master that is requesting the write request, and a mode of operation, such as supervisor or user write access modes. Write buffering may also be dynamically disabled for individual peripherals based on the state of a peripheral by using a hardware side band signal driven by the peripheral to override a static buffer write policy programmed in control registers.