41 results about "Area of a disk" patented technology

A method is disclosed for performing a defect scan for a disk drive. Data is recorded on a first data area of a disk substantially free from defects and on a second data area of the disk substantially affected by at least one defect. A defect scan parameter is initialized with an initial setting. The first data area is read to determine a first defect threshold, and the second data area is read to determine a second defect threshold. A margin is saved representing a difference between the first and second defect thresholds. The setting for the defect scan parameter is adjusted, and the elements of reading the first and second data areas and saving a corresponding margin are repeated at least once. A setting is then selected for the defect scan parameter in response to the saved margins.

The present invention relates to a method of detecting a defect area without any mistake during data recording on a writable disk. This method detects a level of a servo error signal produced during a recording operation, checks whether the servo error signal is in an abnormal state based on the detected level, detects a periodic wobble signal or periodicity of the abnormal state occurrences of the servo error signal produced during the recording operation, and determines whether a recording area is in defect based on successful decoding of the detected periodic wobble signal or the periodicity of the abnormal state occurrences if the servo error signal is in an abnormal state. This method ensures exact detection of a defect area, whereby unnecessary speed reduction can be eliminated and successful data writing can be also guaranteed even in a defect area.

The present invention provides a data access method and apparatus, which belong to the technical field of databases. The method comprises: acquiring an access mode of data and a key; according to a hash value of the key, determining an access position of the data in a hash table of a memory or in a hash index area of a disk, wherein the hash index area is established according to a deformed B+ tree; and accessing the data at the access position of the data according to a storage mode. The hash value in the disk is stored in a manner of the deformed B+ tree, and storage of the hash value increases data searching efficiency; the manner of the deformed B+ tree enhances expansibility of data storage, and the storage mode can improve efficiency of data searching in the disk; and according to the data access method, during data access based on the storage mode, after determining the access position of the data in the memory or the disk according to the hash value, the data can be directly accessed from the access position, so that requirements for memory configuration are reduced and a step of reading the data back to the memory in the prior art is avoided.

Disclosed is a disk-like recording medium, a disk recording apparatus and a disk recording method, and a disk playback apparatus and a disk playback method. Disk ID is recorded over a circle of a burst cutting area on an optical disk. The circle is divided into n blocks, each of the blocks is divided into m frames, and ID information is recorded in each of the frames with k channel bits.

For protecting data within a data storage system, such as a hard disk drive, security enable mode is entered. In that mode, initialization data is moved from a first area of a disk to a second area of the disk with a location of the second area being randomly generated. The initialization data is then erased from the first area. Also, a first cipher for firmware and a second cipher for a disk are both changed into a randomly generated value. Later, access to the initialization data from the second area is granted in the security enable mode if the first and second ciphers are the same.

The invention provides a storage system. The temporary area capacity required to be secured with respect to the whole permanent area is calculated in accordance with the capacity and access frequency of a host computer data permanent area of a disk device contained in the storage system and a disk device of an external storage device that is managed by a storage virtualization function of this storage system. The nonvolatile memory of this capacity is defined as the temporary area and is used to temporarily store host computer data when a data I / O from the host computer is processed. In addition, the required capacity of the temporary area of the nonvolatile memory is re-calculated in accordance with an event such as a configuration change where the external storage system is increased or reduced or the nonvolatile memory is increased or reduced and, if necessary, control is exercised to increase or reduce the capacity of the temporary area of the nonvolatile memory.

The present invention relates to a method of changing a recording mode from CAV (Constant Angular Velocity) to CLV (Constant Linear Velocity) mode in the middle of recording data to a disk recording medium. A method according to the present invention reads ATIP-framed data encoded in a wobble signal formed along a spiral physical track while recording input data to a recording medium, detects a sync signal contained in the read ATIP-framed data. Another method measures frequency of a low-frequency component of the wobble signal instead of reading ATIP-framed data. These two methods determines, in common, when to change the recording mode from CAV to CLV based on the period of the detected sync signal or the measured frequency. The present invention makes it possible to record input data to an entire area of a disk more rapidly without fatal errors such as imperfect writing. As a result, total recording time can be reduced with stable recording guaranteed.

A recording and / or reproducing apparatus, medium, and method controlling a write speed of a disk drive. The method may includes measuring a predetermined disk quality evaluating factor affecting a servo control performance in multiple areas of a disk, determining an optimal write speed of the areas of the disk corresponding to the disk quality evaluating factor, and controlling a rotation speed of the disk at an optimal write speed of a corresponding area of the disk, depending on a position of the disk in which writing is to be performed, in a writing mode.

The invention provides a video data storage utilization and video data managing method and device. The video data storage utilization method includes: creating a super block in the super block area of a disk, creating disk abstracts in the abstract area of the disk, creating disk data blocks in one-to-one correspondence to the disk abstracts in the data area of the disk, wherein each disk abstract includes channel number fields and starting time fields, and the channel number of video managing equipment corresponding to the video data stored in the disk data blocks corresponding the disk abstracts are stored in the channel number fields; when a video data storage request is received, selecting idle disk data blocks for data storage, and recording the information of the video data in the disk abstracts corresponding to the data blocks. By the method, the problem that video data cannot be stored when one disk fails in the prior art is solved.

A method of detecting incomplete edge bead removal from a disk-like object is disclosed. First a peripheral area of a disk-like reference object is imaged. Marks are then defined in the peripheral area of the reference object. Finally, images of peripheral areas of a plurality of disk-like objects of the same batch are recorded. The inspection of the disk-like objects is limited to the locations of the marks defined on the reference object.

A method of detecting incomplete edge bead removal from a disk-like object is disclosed. First a peripheral area of a disk-like reference object is imaged. Marks are then defined in the peripheral area of the reference object. Finally, images of peripheral areas of a plurality of disk-like objects of the same batch are recorded. The inspection of the disk-like objects is limited to the locations of the marks defined on the reference object.

A head IC amplifies an output of a read head including MR elements and an ADC converts the amplified output into a digital value. When a CPU performs a head load operation to load a composite head including the read head onto a data area of a disk medium from a ramp, the CPU receives the output of the read head amplified by the head IC as a detection result of an external magnetic field applied to an HDD. The CPU determines whether the head load operation is performed or inhibited based on the received, amplified output of the read head, that is, the detection result of the external magnetic field applied to the HDD.

An adapter A1 made of a synthetic resin includes an annular frame 1 having an outside diameter of 12 cm, a disk receiving section 2 provided continuously on a lower portion of an inner edge of the frame 1, and a pair of disk pressing sections 3 and 3 provided continuously on an upper portion of the inner edge of the frame 1. The disk receiving section 2 is provided with a circular opening 4 for causing an information recording area of a disk to face an optical reader of a disk player. A disk press-contact projection 7 formed so that a projection height is gradually increased in a disk rotation direction Y is provided on a lower surface of each disk pressing section 3. This adapter A1 can securely install a non-circular optical disk even if the optical disk has a slightly different size, and an installation operation of the non-circular optical disk can be easily performed.

A recording / reproducing apparatus is provided which can write continuously a file of large-capacity at high-speed. A record area of HDD is provided with a disk cache area for temporarily storing data to be written. The disk cache area is defined as a area that is not used by a host apparatus (3) in an LBA space, and the disk cache area is disposed in an area with a high transfer rate such as an outer circumferential area of a disk (10). A file transferred from the host apparatus (3) is written in the disk cache area, and the file is transferred from the disk cache area to a usual user area during an idle period to release the disk cache area and prepare for next transfer data write.

The invention provides a method used for protecting data in a hard disk and is applied to the hard disk; when a computer implements X-code of the hard disk, the hard disk can be read and the processing of activating an operating system can be finished if an identification code of the hard disk recorded by the hard disk is judged to be identical to an identification code designed by a computer; or the content in a splitting area of a disk in record of a master boot is cleaned up, therefore the hard disk can not be read and the processing of activating the operating system can not be finished. When the hard disk is stolen, another computer can not read the hard disk and finish the boot action, thus achieving the aim of protecting the data of the hard disk.

At least address information that is necessary for access of an input data recording area of a disk-shaped recording medium is recorded in a nonvolatile memory.

For protecting data within a data storage system, such as a hard disk drive, security enable mode is entered. In that mode, initialization data is moved from a first area of a disk to a second area of the disk with a location of the second area being randomly generated. The initialization data is then erased from the first area. Also, a first cipher for firmware and a second cipher for a disk are both changed into a randomly generated value. Later, access to the initialization data from the second area is granted in the security enable mode if the first and second ciphers are the same.

An information processing apparatus includes a hard disk drive, an acceleration detection portion, and a controller. The hard disk drive has a protective function for moving a head from a recording area of a disk to an evacuation position. The acceleration detection portion is configured to detect, as a detection target acceleration, an acceleration in one of a vertical direction and an almost-vertical direction with respect to a gravity direction. The controller is configured to detect a movement based on the acceleration detected as the detection target acceleration and determine whether to activate the protective function of the hard disk drive based on the detected movement.

The invention discloses a dual-control RAID synchronization method and device. The method includes the steps that a master node and a slave node load a dirty bitmap from a metadata area of a disk; the master node and the slave node synchronize an even number of pairs of even data blocks in the bitmap and an odd number of pairs of odd data blocks in the bitmap respectively; every time after the master node and the slave mode synchronize one data block, the bitmap of the metadata area is updated once; after valid bits of the bitmap of the metadata area are emptied, the master node and the slave node load a bitmap of the metadata area again. The master node and the slave node synchronize an even number of pairs of even data blocks in the bitmap and an odd number of pairs of odd data blocks in the bitmap respectively, so dual-control RAID synchronization can be conducted on the two nodes according to an odd number of bits and an even number of bits on the bitmap, load balance is achieved, the phenomenon that the nodes are idle is avoided, dual-control RAID synchronization can be quicker, the time of data loss risks is shortened, and user experience is improved.

An information processing apparatus includes a hard disk drive, an acceleration detection portion, and a controller. The hard disk drive has a protective function for moving a head from a recording area of a disk to an evacuation position. The acceleration detection portion is configured to detect, as a detection target acceleration, an acceleration in one of a vertical direction and an almost-vertical direction with respect to a gravity direction. The controller is configured to detect a movement based on the acceleration detected as the detection target acceleration and determine whether to activate the protective function of the hard disk drive based on the detected movement.

A disk controller and method thereof having a configuration where when a disk apparatus fails, information on the failed disk apparatus is prevented from unauthorized access including a read operation. The disk controller in a disk system connected with a plurality of disk apparatuses includes a control information storage area overwrite unit issuing an instruction to overwrite a control information storage area of a disk apparatus with a predetermined value when a failure of the disk apparatus is detected.

Data is recorded in a data area of a disk in a hierarchical structure of program chains, programs, cells and packs, each pack is constructed by a pack header for identifying the pack and a packet having a data stream recorded therein, the packet has a packet header having a stream ID indicating at least a private stream and a sub-stream ID indicating the classification of the private stream described therein, and the classification indicates packet data of Dolby AC3 audio data, packet data of linear audio data, packet data of sub-picture data, or packet data of computer data.