Abstract: An information recording medium, on which when a spare area for a replacement block for replacing a defect block created in a predetermined area of an information recording medium is enlarged or newly allocated, defect status information of blocks within the enlarged or newly allocated spare area is changed and written on the information recording medium. By managing the defect status information of the blocks within the enlarged or newly allocated spare area, unnecessary operations of a drive system are eliminated thus improving efficiency of the drive system.

Abstract: A drive apparatus of the present invention includes a recording/reproduction section and a drive control section. The drive control section performs a process including: determining whether or not replacement management information including a replacement physical address is found in the replacement management information list, the replacement physical address matching the physical address corresponding to the logical address included in the recording instruction, when the replacement management information is not found, as a first time pseudo-overwrite recording for a location indicated by the physical address corresponding to the logical address included in the recording instruction, performing a process; and when the replacement management information is found, as a second time or more pseudo-overwrite recording for a location indicated by the physical address corresponding to the logical address included in the recording instruction, performing a process.

Abstract: Provided is an optical disc recording/reproducing apparatus that performs recording and reproducing.

Abstract: A method of verifying whether a recording and/or reproducing apparatus that records and/or reproduces a disc having temporary defect management area (TDMA) information properly produces the TDMA information, the method including producing TDMA information produced by performing a recording test according to a series of recording operations based on a scenario using a blank test disc as test information; and providing a result of the recording test by confirming the test information using reference test information for the recording test.

Abstract: A data reproducing method for reproducing data, upon an optical disk of rewritable type, having an alternated block management area, a data area, on which recording/reproducing of the information is conducted by a unit of block, and an alternation area, on which recording/reproducing of information including a defective sector therein is conducted by the unit of block, through an information recording/reproducing apparatus enabling to execute Read Modify Write operation thereon, comprising the following steps of, in case where said alternation areas are in a plural number thereof when executing Read Modify Write operation onto said optical disk of rewritable type: executing reproducing on said data area including the defective sector therein, by only one (1) time; executing reproducing on said alternation area, thereafter, so as to hold data reproduced; and thereby reproducing the data. With this, it is possible to increase speed (i.e.

Abstract: It has been discovered that inaccurate representations of content read from an optical disc can be restored. A representation of content read from a damaged optical disc may include data that corresponds to misread data sections. The data for the misread data sections can be replaced with portions of an accurate representation of the content. The portions can be extracted from an accurate representation maintained online or at a local repository of digital representations of content.

Abstract: A write-once disc, an apparatus for recording information thereon, and a method of reducing access time thereto the write-once disc including at least one record layer. The write-once disc also includes at least one update area in which updated predetermined information is recorded; and an access information area in which location information regarding the updated predetermined information, is recorded for a predetermined period. Accordingly, it is possible to reduce an access time for reading information updated in the write-once disc on which predetermined information is updated and recorded on a new position.

Abstract: A physical structure suitable for a recording medium such as a BD, and a method and apparatus for recording data in the recording medium using the physical structure are disclosed. The recording medium includes an inner area, a data area, and an outer area. The recording medium includes a test area contained in at least one of the inner area and the outer area, and a management area for storing a position information indicating a position available for testing in the test area, wherein the position information includes a start position of first data unit available for testing and a position of second data unit available for testing, wherein one or more second data units comprise first data unit. Therefore, the recording medium can be applied to a method for manufacturing a BD, and a disc test process and data recording/reproducing operations can be effectively performed.

Abstract: On an optical disk medium, a spare area is allocated separately from a recording area. If the recording area includes a defective sector, alternate recording for the defective sector is performed in the spare area. An optical disk drive comprises: a medium information acquisition part which acquires, from the optical disk medium, medium information specific to the medium; and an area size determination part which determines the spare-area size suitable for the medium on the basis of the acquired medium information. The medium information is information about, for example, a media manufacturer, and a media type number. Further, there is provided a table which stores the relationship between the medium information and the optimum size of the spare area.

Abstract: A method for inspecting an optical information storage medium includes the steps of: irradiating the storage medium with a laser beam and rotating the medium by a constant linear velocity control technique by reference to the radial location at which the laser beam forms a spot on the medium; changing the rotational velocities according to the radial location on the medium between at least two linear velocities that include a first linear velocity Lv1 and a second linear velocity Lv2 higher than the first linear velocity Lv1; generating a focus error signal and/or a tracking error signal based on the light reflected from the medium; performing a focus control and/or a tracking control on the laser beam that irradiates the medium based on the focus and/or tracking error signal(s); and passing the branched outputs of control loops for the focus and/or tracking error signal(s) through predetermined types of frequency band-elimination filters for the focus and/or tracking error signal(s) to obtain residual errors

Abstract: An optical article for playback in a player, the optical article including at least one sector having data, and a mark disposed in a predetermined relationship with the at least one sector, wherein the mark renders a portion of the data generally unreadable. The optical article further includes error correction code associated with the at least one sector, wherein data within the error correction code is configured as partially corrupted. The inclusion of partially corrupted error correction code reduces the size of the mark or spot required to render the data sector uncorrectable.

Abstract: A method for inspecting an optical information storage medium includes the steps of: irradiating the storage medium with a laser beam and rotating the medium by a constant linear velocity control technique by reference to the radial location at which the laser beam forms a spot on the medium; changing the rotational velocities according to the radial location on the medium between at least two linear velocities that include a first linear velocity Lv1 and a second linear velocity Lv2 higher than the first linear velocity Lv1; generating a focus error signal and/or a tracking error signal based on the light reflected from the medium; performing a focus control and/or a tracking control on the laser beam that irradiates the medium based on the focus and/or tracking error signal(s); and passing the branched outputs of control loops for the focus and/or tracking error signal(s) through predetermined types of frequency band-elimination filters for the focus and/or tracking error signal(s) to obtain residual errors

Abstract: A disk device that records information on a storage medium includes a first reading-out section that reads out defective address information in which a defective address indicative of a physical position of a defective part of the storage medium is recorded; a blocking section that, when a value of intervals between a plurality of the defective addresses in the defective address information which has been read out by the first reading-out section is less than a specific value in terms of a specific unit, sets the specific unit as a defective block; a second reading-out section that reads out data fin the defective block set by the blocking section; and a writing section that writes the data which has been read out by the second reading-out section into an area different from the defective block in the storage medium based on the specific unit.

Abstract: A method of recording a temporary defect list on a write-once recording medium, a method of reproducing the temporary defect list, an apparatus for recording and/or reproducing the temporary defect list, and the write-once recording medium. The method of recording a temporary defect list for defect management on a write-once recording medium includes recording the temporary defect list, which is created while data is recorded on the write-once recording medium, in at least one cluster of the write-once recording medium, and verifying if a defect is generated in the at least one cluster. Then, the method includes re-recording data originally recorded in a defective cluster in another cluster, and recording pointer information, which indicates a location of the at least one cluster where the temporary defect list is recorded, on the write-once recording medium.

Abstract: A write once disc, a disc drive therefor, and a method of managing disc defects on the write once disc using the disc drive in consideration of the compatibility of the write once disc with a rewritable disc drive, the write once disc includes a single record layer disc in which a lead-in area, a data area, and a lead-out area are sequentially formed and a first spare area and a second spare area are sequentially formed in the data area. The write once disc includes a defect management area (DMA) formed in at least one of the lead-in area and the lead-out area; a first temporary defect management area (TDMA) formed in at least one of the lead-in area and the lead-out area; and a second TDMA formed between the first spare area and a user data area or between the user data area and the second spare area.

Abstract: A recording medium, and a method and apparatus for recording management information on the recording medium are discussed. According to an embodiment, the invention provides a method of recording management information on a recording medium, the recording medium including a temporary defect management area (TDMA) and a final defect management area (DMA), the DMA including a defect list area, the method comprising: recording, in the TDMA, defect list information produced while the recording medium is in use, and recording, in the defect list area of the DMA, the latest defect list information included in the TDMA when the recording medium is to be finalized, wherein the defect list area of the DMA includes a plurality of recording units, and the latest defect list information is recorded on at least one of the recording units of the defect list area.

Abstract: A technique to detect defects when reading a defect scan pattern stored on a disk in which the detected defects are processed differently depending on which region of a sector the defect is resident. In one implementation, a mask is used to identify the defects of different regions. By differentiating different regions within the sector for defect scan, sync mark and preamble fields may be treated as critical regions so that different defect scan properties may be attributed when performing the defect scan.

Abstract: There is provided an optical disk device which quickly inspects the presence or absence of a defect in an optical disk in order to ensure that it can be played back on various types of optical disk devices. A detection unit uses signals supplied from a playback unit to detect defects from each of an RF signal, a focus error signal, and a tracking error signal. A CPU stores positions of the defects in a memory. The playback unit plays back data while degrading playback conditions at the positions of the defects . The detection unit detects an error rate of the played-back data, and finally determines whether the optical disk is “OK” or “NG”.

Abstract: A defect management method applied in an optical disc drive for managing defect information of an optical disc is disclosed. The optical disc drive saves a plurality of defect tables comprising at least a first defect table and a second defect table. The first defect table records a plurality of first defect entries and the second defect table records a plurality of second defect entries. The method includes appending an adaptive defect entry comprising a new defect information corresponding to a new defect into a new defect table, a data structure of the adaptive defect entry conforming to a data structure of at least one of the defect entries recorded in the defect tables; and merging the adaptive defect entries into one of the defect tables saved in the optical disc drive when a condition is met.

Abstract: A write-once optical recording medium, a method for allocating a defect management area of the write-once optical recording medium, and a method for allocating a spare area of the write-once optical recording medium are provided. A method of managing defects on a write-once optical recording medium having at least one recording layer includes the steps of allocating at least one temporary defect management area having a fixed size and at least one temporary defect management area having a variable size to said optical recording medium, respectively, recording defect management information on the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size; and using the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size is provided herein.

Abstract: An optical disc (1) for storing digital data, comprising a first storage area (10) for storing a first type of digital data and a second storage area (20) for storing a second type of digital data. Each of the first and second areas comprises a user-data area (11, 21). Furthermore, the storage areas (10, 20) are logically independent. The second storage area (20) has a defect management area (22a, 22b) associated with the user-data area (21) of the second storage area (20) for storing defect management data.

Abstract: A method of reproducing data from an optical storage medium includes reproducing write protection information from the optical storage medium. The optical information storage medium includes a lead-in area, a user data zone in which user data is recorded, and a lead-out area. The write protection information is recorded in at least one of the lead-in area and the lead-out area, together with defect management information. The data is recorded and/or reproduced according to the defect management information and the write protection information. The write protection information indicates a size of a write protected area differentiated from a plurality of sizes of write protected areas of the optical information storage medium.

Abstract: Various embodiments of the present invention provide systems and methods for media defect detection. For example, a media defect detection systems is disclosed that includes a data input derived from a medium, a fast envelope calculation circuit that receives the data input and provides a fast decay envelope value based on the data input, a slow envelope calculation circuit that receives the data input and provides a slow decay envelope value based on the data input, and a media defect detection circuit. The media defect detection circuit receives the slow decay envelope value and the fast decay envelope value, calculates a ratio value of the fast decay envelope value to the slow decay envelope value, and asserts a defect output based at least in part on the comparison of the ratio value to a defect threshold value.

Abstract: A write once optical recording medium and a method and apparatus for storing and recovering defect management information to and from the write once optical recording medium are provided. The recording medium includes at least one recording layer, and a data area on the recording layer. The data area includes at least one spare area and a user data area. The spare area contains at least one replacement cluster, each of the replacement clusters storing therein address information of a corresponding defective cluster.

Abstract: A system controlling recording on an optical disc is provided. A first counter performs a bit count according to provided channel bit clock signals. A second counter performs a sector count responsive to the bit count obtained by the first counter. The Land/Groove switch predicts machine uses the result of bit count and sector count to predict the land/groove switch point. The processor uses the physical ID (PID) to determine the track type of a sector at which a recording operation initiates. The power controller determines a recording power for the recording operation according to the Land/Groove switch predict machine.

Abstract: It is determined whether an error will occur due to presence of a defective area like a bubble and the storage area is managed according to the size of the defective area such that no data is written on the defective area once an error has occurred.

Abstract: Replacement data for updating data recorded on an information storage medium is recorded in an area for logical overwrite (LOW) replacement; replacement data for replacing a defect generated on the medium is recorded in an area for defect replacement; and, if a defect is generated in an original block recorded in a predetermined area of the medium during a read-modify-write (RMW) process for a LOW for at least partial data of an original block, a replacement block replacing the original block is recorded in the area for LOW replacement and a defect list (DFL) entry including location information of the original block and location information of the replacement block is generated to indicate the replacement state.

Abstract: A write-once-type recording medium (10) is provided with: a data area (11) to record therein record data; and a plurality of management areas in which a plurality of types of management information for managing the record data and index information for indicating newest management information can be recorded a plurality of times, each of the plurality of management areas having a setup area for recording therein a management information block including a plurality of types of management information constructed from the newest management information and the index information indicating the plurality of types of management information constructed from the newest management information.

Abstract: The data structure on the recording medium includes a temporary defect management area storing a data block. The data block includes a space bit map and a temporary definition structure. The space bit map indicates recordation status of the data area, and the temporary definition structure provides a pointer to the space bit map.

Abstract: In an embodiment of the method of over-writing a recording medium, if data for writing on the recording medium is to be written on a recorded portion of a user data area of the recording medium, an unrecorded portion of the recording medium is selected as a replacement portion for recording the data and the data is recorded in the replacement portion.

Abstract: A method and apparatus for managing a defective area on a optical recording medium, e.g., of writable once type, permits more efficient writing and management of defect list information or temporary defect list information for managing the defective area in a minimum recording size. The method includes writing data in a defective area existing on a high density optical disc, e.g., such as a BD-WO, in a spare area in place of the defective area, producing defect list information for access to the data replacement written in the spare area and writing in a particular area for defect management. The defect entries actually corresponding to the replacement written data, and writing location information of the next available spare area are written and managed as defect list information for management, or the writing location information of a location where replacement writing is possible is written and managed as defect definition structure information.

Abstract: A write-once optical disc, and an apparatus and method for recording management information on the optical disc are provided. The disc includes at least one recording layer, a plurality of temporary defect management areas (TDMAs) on the at least one recording layer, and a plurality of defect management areas (DMAs) on the at least one recording layer. At least one of the TDMAs includes first and second indicators. The first indicator indicates which TDMA is an in-use TDMA, and the second indicator indicates whether or not the recording medium is closed.

Abstract: An optical drive device generates a fist push-pull signal and a first sum signal based on a light receiving amount in two light receiving areas of which each width in a signal light tangent direction is smaller than a diameter of a spot of signal light, generates a first normalized push-pull signal by normalizing the first push-pull signal by using the first suits signal, and generates a tracking error signal based on the first normalized push-pull signal.

Abstract: A method, apparatus and computer readable medium for managing recording medium defects and a defect managed recording medium. The recording medium includes a spare area in which a replacement area, which is a substitute for a defective area of the recording medium, is formed, and a temporary defect management area in which temporary management information that specifies the defective area and the corresponding replacement area is recorded, wherein position information and state information regarding the defective area are recorded in the replacement area. Accordingly, it is possible to restore defect information even if recording medium defect management on the recording medium ended abnormally.

Abstract: A method for performing a servo defect compensating operation by compensating a servo-related signal in an optical disc drive and a related optical disc drive system with a DSP is provided. The method comprises: reading an optical medium by an optical pick-up unit; detecting whether a defect exists by monitoring a side beam signal; when the defect on the optical medium is detected, determining a new compensation value based on a servo error signal; and compensating the servo-related signal with the new compensation value during defect crossing to adjust servo control when the optical pick-up unit passes the defect.

Abstract: A method of reproducing a recording medium having finalized recorded data. Data is read from the recording medium and a determination is made whether the recording medium is further recordable based on whether a temporary defect management area includes repetitions of a predetermined value or based on whether another predetermined value is recorded in response to a finalization command previously recorded.

Abstract: An information recording medium includes an access control area in which access control data (ACD) is recorded, the ACD having common information set to allow a recording/reproducing apparatus that cannot recognize a predetermined function of the information recording medium to control access to the information recording medium; and an ACD state information area in which state information regarding one of defectiveness and recordability of an ACD block, at which the ACD is recorded in the access control area, is recorded.

Abstract: An information recording apparatus that records information on an information recording medium includes a setting mechanism that sets defect management information including information with respect to a specific area in a recording area of the information recording medium in which a defect detection process need not be performed, a recording mechanism that records data in the recording area, and a determining mechanism that determines whether to perform the defect detection process in a recording target area in the recording area in which the data is recorded, based on the defect management information and information with respect to the recording target area. By setting an AV data area as a specific area and by setting a PC data area as a defect management area, the continuity of data recorded in the AV data area is achieved, and the reliability of data recorded in the PC data area is ensured.

Abstract: A write once optical recording medium and a method and apparatus for storing and recovering defect management information to and from the write once optical recording medium are provided. The recording medium includes at least one recording layer, and a data area on the recording layer. The data area includes at least one spare area and a user data area. The spare area contains at least one replacement cluster, each of the replacement clusters storing therein address information of a corresponding defective cluster.

Abstract: The present invention provides a method and apparatus for robust tracking at narrow track-pitches on optical discs, enabling higher densities on Blu-ray Discs (5) as well as near-field discs. Increasing radial density results in loss of radial diffraction within the numerical aperture of the lens. Due to this loss in diffraction, current tracking methods, such as Push-Pull and Differential Phase Detection (DPD), will stop working. The invention provides a method and apparatus that relies on cross-correlating the central aperture (CA) signals of 3 optical spots (22, 24, 26) that are positioned such that there are a central spot (24) and spots (22, 26) positioned to the left (22) and right (26) of the central spot (4). By using CA signals, the tangential diffraction is used, which is hardly affected by a track-pitch reduction.

Abstract: 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.

Abstract: A write-once-type recording medium (100) on which record data can be recorded only once, provided with: a data area (108) to record therein the record data; and a shared area (104, 105) to temporarily record therein evacuation data which is record data to be recorded or already recorded at a position of a defect in the data area and defect management information (120) including an evacuation source address of the evacuation data, the evacuation data being recorded with one predetermined point which exists in the shared area as a start point, the defect management information being recorded with another predetermined point which exists at a different point from the one point as a start point, in the shared area.

Abstract: A write once disc, a disc drive therefor, and a method of managing disc defects on the write once disc using the disc drive in consideration of the compatibility of the write once disc with a rewritable disc drive, the write once disc includes a single record layer disc in which a lead-in area, a data area, and a lead-out area are sequentially formed and a first spare area and a second spare area are sequentially formed in the data area. The write once disc includes a defect management area (DMA) formed in at least one of the lead-in area and the lead-out area; a first temporary defect management area (TDMA) formed in at least one of the lead-in area and the lead-out area; and a second TDMA formed between the first spare area and a user data area or between the user data area and the second spare area.

Abstract: A disc with a temporary defect management information area and a defect management area includes a defect management area that is present in at least one of a lead-in area, a lead-out area, and an outer area, a temporary defect information area which is formed in the data area and in which temporary defect information is recorded, and a temporary defect management information area which is present in at least one of the lead-in area, and the lead-out area. Accordingly, it is possible to record user data in a recordable disc, especially, a write-once disc, while performing defect management thereon, thereby enabling efficient use of a defect management area having a limited recording capacity.

Abstract: There are included a plurality of record information recording areas (OPC areas PCA0, user data areas 109-0 or spare areas SA) for recording record information; a management information recording area (management area MA) for recording a plurality of management information for managing the respective ones of the plurality of record information recording areas; and a reliability information recording area (management area MA) for recording a plurality of reliability information (reliability flag group 150) that indicate, for each of the plurality of management information (120, 130 or 140), reliability as to whether the plurality of management information are correctly updated.

Abstract: A write-once optical recording medium, a method for allocating a defect management area of the write-once optical recording medium, and a method for allocating a spare area of the write-once optical recording medium are provided. A method of managing defects on a write-once optical recording medium having at least one recording layer includes the steps of allocating at least one temporary defect management area having a fixed size and at least one temporary defect management area having a variable size to said optical recording medium, respectively, recording defect management information on the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size; and using the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size is provided herein.

Abstract: A method of overwriting data in a write-once information storage medium and a data recording and/or reproducing apparatus therefor. In the data overwriting method, a command to overwrite new data in a first area of the write-once information storage medium where data has already been recorded is issued. Then, the first area is considered as a defective area, and the new data is recorded in a second area. Thereafter, updated defect management information, including information about the locations of the first and second areas, is recorded in the write-once information storage medium. Accordingly, overwriting can be performed in write-once information storage media, which is incapable of physical overwriting, by using a logical overwriting technique. Thus, data recorded in the write-once information storage medium may be changed or updated.

Abstract: A method, apparatus and computer readable medium for managing recording medium defects and a defect managed recording medium. The recording medium includes a spare area in which a replacement area, which is a substitute for a defective area of the recording medium, is formed, and a temporary defect management area in which temporary management information that specifies the defective area and the corresponding replacement area is recorded, wherein position information and state information regarding the defective area are recorded in the replacement area. Accordingly, it is possible to restore defect information even if recording medium defect management on the recording medium ended abnormally.

Abstract: When a primary spare area is allocated for slipping replacement and linear replacement upon initialization, and a remaining portion of the primary spare area after slipping replacement and allocated for linear replacement after initialization are insufficient, a supplementary spare area is allocated. The sizes of the primary and supplementary spare areas are determined by the number of defects generated upon initialization. The information on the sizes of the spare areas, and the remainder state information representing the degree of use of the spare areas, are recorded, so that the spare areas can be efficiently managed. Also, in the defect management method, when an area that has already been linearly replaced is allocated as a supplementary spare area, defective blocks within the allocated supplementary spare area are not used for linear replacement, and the entries of a secondary defect list (SDL) with respect to the defective blocks are not changed.

Abstract: A data processing apparatus utilized for reproducing data from an optical storage medium has individual checking modules for separately controlling a data outputting operation of a data buffering unit according to the data buffered in the data buffering unit and a primary defect list, and for controlling a decoding operation of a decoding unit according to the data stored in a memory unit and a secondary defect list. The flow path of the related data processing method is therefore simplified because all the checking operations of the defective status of the data read from the optical storage medium are accomplished by the checking modules.