Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
  • G11B7/0045—Recording
  • G11B7/00456—Recording strategies, e.g. pulse sequences
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
  • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
  • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
  • G11B19/122—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of an identification or authentication mark
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/10009—Improvement or modification of read or write signals
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/10009—Improvement or modification of read or write signals
  • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
  • G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
  • G11B20/1258—Formatting, e.g. arrangement of data block or words on the record carriers on discs where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
  • G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
  • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
  • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
  • G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
  • G11B2020/1229—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc lead-in area
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
  • G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
  • G11B2020/1242—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc the area forming one or more zones, wherein each zone is shaped like an annulus or a circular sector
  • G11B2020/1248—ROM zone, i.e. an unrewritable zone
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
  • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
  • G11B2020/1278—Physical format specifications of the record carrier, e.g. compliance with a specific standard, recording density, number of layers, start of data zone or lead-out
  • G11B2020/1279—Permanent information and control data stored in the PIC zone of a Blu-Ray disc
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
  • G11B2220/215—Recordable discs
  • G11B2220/216—Rewritable discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
  • G11B2220/215—Recordable discs
  • G11B2220/218—Write-once discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
  • G11B2220/2537—Optical discs
  • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
  • G11B7/006—Overwriting
  • G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
  • G11B7/24035—Recording layers
  • G11B7/24038—Multiple laminated recording layers

Definitions

• the present invention relates to a method of recording control information on a recording medium, such as a recordable optical disc, and a method of recording data on a recording medium using the control information.
• HD-DVD high-density optical recording medium
• BD Blu-ray disc
• Blu-ray disc known as Ix speed BD-RE and now under discussed should be compatible with BD-RE discs expected to have higher writing speed, i.e., 2x speed BD-RE and beyond.
• BD-WO specifications for high writing speed are also in progress. Efficient solutions for coping with the high writing speed of a high-density optical disc are urgently needed, and the specifications established should ensure mutual compatibility.
• the present invention is directed to a method of recording control information in an optical disc that substantially obviates one or more problems due to limitations and disadvantages of the related art.
• An object of the present invention is to provide a new method of recording control information as specified information coping with high writing speed, in which information indicating a kind of control information is recorded within the control information as well as a write strategy interworking with the recorded information.
• Another object of the present invention is to define a new data structure configuring control information.
• Another object of the present invention is to provide a specified method of recording control information coping with high writing speed in a specific area within a disc, by which reciprocal compatibility is provided between the same based discs.
• a further object of the present invention is to provide a recording/reproducing method and apparatus thereof, by which real data is recorded/reproduced on/from an optical disc using the recorded control information.
• a method of recording control information on a recording medium includes the steps of generating a control information associated with at least one or more recording layers and recording velocities, the control information including first information identifying a type of the corresponding control information, the information indicating whether the control information is used for CLV (constant linear velocity) or CAV(constant angular velocity), and a write strategy parameters associated with the type of the control information; and recording the control information on a specific area of the recording medium.
• a data structure of a control information recorded on a recording medium or to be recorded/reproduced on/from the recording medium characterized in that the control information associated with a specific recording layer and/or a specific recording velocity and the control information comprises write strategy information dependent on a type information indicating whether the control information is associated with CAV or CLV.
• a recording medium includes at least one recording layer provided with a recordable area and a pre-recorded area, wherein a disc information is separately provided according to each recording velocity and/or each recording layer to the pre-recorded area and wherein an identification information identifying a type of the disc information therein and a write strategy information associated with the identification information therein are provided to the disc information.
• An optical disc includes at least one or more recording layers, wherein a control information is provided according to each recording layer and/or each recording velocity, wherein an identification information identifying a type of the control information and a write strategy parameters associated with the identification information are recorded within the control information.
• a method of recording data on a recording medium includes the steps of reading a plurality of control information separately recorded according to each recording velocity within a management area of the recording medium, checking an identification information identifying a control information type recorded within each control information, and performing a recording of data based on a write strategy information associated with a corresponding recording velocity from the identification information.
• a method of recording data on a recording medium includes the steps of identifying a specific control information based on an identification information identifying a type of control information, wherein the control information associated with specific recording velocity and/or specific recording layer to provide a reference information for recording or reading of data, the identification information identifying whether the control information is used for CLV or CAV, and recording data using write strategy parameters included in the control information to be used for CLV or CAV as a result of identifying step.
• an apparatus for recording data on a recording medium includes an optical pickup reading a plurality of control information associated with at least recording velocity within a management area of the recording medium; and a controller checking a control information type based on an identification information to identify whether the corresponding control information is used for CLV or CAV, reading a write strategy included in the corresponding control information as a result of the checking step, and performing the recording of data using the read write strategy.
• FIG. 1 is a diagram of a single-layer disc applicable to the present invention
• FIG. 2 is a diagram of a dual-layer disc applicable to the present invention
• FIG. 3 is a diagram of a management area where control information of the present invention is recorded, in which a format of the disc information in a corresponding area is schematically shown;
• FIG. 4 is a diagram of control information recorded according to one embodiment of the present invention.
• FIG. 5 is a diagram of a write strategy within control information recorded according to one embodiment of the present invention in FIG. 4;
• FIG. 6 is a diagram of control information recorded according to another embodiment of the present invention.
• FIG. 7 is a diagram of control information recorded according to a further embodiment of the present invention
• FIG. 8 is a diagram of a write strategy within control information recorded according to the further embodiment of the present invention in FIG. 7;
• FIG. 9 is a diagram of another example of a write strategy within control information recorded according to the further embodiment of the present invention in FIG. 7;
• FIG. 10 is a diagram of control information recorded according to another further embodiment of the present invention.
• FIG. 11 is a diagram of a write strategy within control information recorded according to the another further " embodiment of the present invention in FIG. 10; and
• FIG. 12 is a block diagram of an optical disc recording/reproducing apparatus according to the, present invention.
• a Blu-ray disc is taken as an example of an optical disc according to the present invention. Yet, the concept of the present invention, characterized ' in an optical disc having its control information recorded thereon, is applicable to DVD-RAM, DVD-RW, DVD+RW, DVD-R, DVD+R and similar such discs. , Although the terminology used herein is well known for the- most part, some terms have been chosen by the applicant, such that the present invention should be understood with the intended meanings of the terminology as used by the applicant .
• the 'control information' of a disc is recorded in a specified area, i.e., a recordable area of the disc or a prerecorded area, sometimes known as an embossed area, in which manufacturer data is recorded and where no further recording is possible, and includes information necessary for the playback of a recorded disc.
• Disc control information is called "disc information" or "DI" in relation to Blu-ray disc technology but is typically referred to as 'physical format information' for DVD-RAM, DVD-RW, DVD+RW, DVD-R, DVD+R discs.
• the disc information according to the present invention is recorded as an unspecified unit of information, which may be counted, for example, as a first or second information.
• the present invention is characterized in that a write strategy (WS) is recorded by interworking with information that identifies a kind of disc information in recording the write strategy (WS) within disc information, one of a plurality of write strategy types is selectively recorded on manufacturing a disc, and a recording/reproducing apparatus (FIG. 12) performs recording/reproducing by referring to the write strategy (WS) recorded within the disc information.
• a write strategy (WS) is recorded by interworking with information that identifies a kind of disc information in recording the write strategy (WS) within disc information
• one of a plurality of write strategy types is selectively recorded on manufacturing a disc
• a recording/reproducing apparatus FIG. 12
• 'write strategy (WS) ' a medium property of a recording layer is generally modified by applying a laser beam to the recording layer within an optical disc via a pickup ('11' in FIG. 12) to perform a recording thereof.
• a strength (write power) of the laser beam a time of applying the write power thereto, and the like.
• the above decided various kinds of record-associated information are named 'write strategy (WS) ' in general and specific contents recorded within a specific 'write strategy (WS) ' are named 'write strategy (WS) parameters' .
• Write strategy (WS) information used in the present invention means the entire information associated with write strategy (WS) .
• 'WS parameters' means items and specific numeric values configuring the WS and is a sort of WS information.
• the WS information has an inclusive concept including the above- described 'WS Type' , 'WS flag' that will be explained later, and the like as well as the WS parameters.
• the write strategy (WS) can be recorded in various ways. As a disc tends to be highly densified and to run at higher speed, a writing speed, i.e., disc RPM) as well as the medium property of the recording layer is considerably affected. Hence, a more accurate system is requested. And, the various write strategies (WS) are explained as follows for example. First of all, there is a system having a recording pulse smaller by 1 than a recording mark size (n) formed on a recording layer medium, which may be called ' (n-1) WS' . Secondly, there is a system having a recording pulse having a size amounting to a half of the recording mark size (n) , which may be called
• a disc manufacturer selects a specific WS to test write power according to write strategy parameters and then records a result of the test in 'WS parameters' field in a specific area within the disc information.
• CLV constant linear velocity
• CAV constant angular velocity
• FIG. 1 and FIG. 2 are structural diagrams of optical discs according to the present invention, in which a recordable optical disc is enough to be the optical disc applicable to the present invention. Moreover, the recordable disc can be any one of a rewritable optical disc, a write-once optical disc, and the like.
• FIG. 1 is a structural diagram of a single-layer disc having one recording layer according to the present invention.
• a lead-in area is provided as a management area on an inner circumference area of an optical disc
• a lead-out area is provided as a management area on an outer circumference area of the optical disc.
• a prerecorded area and a rewritable or write-once area are separated from each other within the inner circumference area of the disc .
• the prerecorded area is an area (called 'embossed area') where data was already written in manufacturing the disc, whereby a user or system is unable to perform data writing on the prerecorded area at all.
• the prerecorded area is named PIC (permanent information and control data) area.
• PIC permanent information and control data
• 'DI' disc information
• a data area provided are a user data area where user's real data is recorded and spare areas ISA and OSA to replace a generated defect area.
• TDMA temporary defect management area
• BD- WO write-once optical disc
• TDMA re-writable BD
• the present invention intends to provide a method of efficiently recording disc information (DI) as control information required for record playback of a disc in the prerecorded or recordable area. It is apparent that a recording method in the prerecorded area is differently applied to each kind of discs.
• the PIC area as the prerecorded area is recorded by biphased high frequency modulated signals, the high frequency modulated signals in the corresponding area are played back according to a specific playback method, and information is acquired from the playback.
• FIG. 2 is a diagram of a dual- layer disc having dual recording layers, in which a recording layer starting with a lead-in is named a first recording layer LayerO and a recording layer ending with a lead-out is named a second recording layer Layerl .
• the PIC area is provided to lead-in and lead-out areas of a disc inner circumference area, and disc information (DI) of the same contents is recorded in the PIC area.
• DI disc information
• FIG. 3 is a structural diagram of a PIC area in the disc shown in FIG. 1 or FIG. 2. As mentioned in the foregoing description, it means that information can be rearranged like the structure of the PIC area in FIG. 3 when the entire information within the high frequency modulated PIC area is acquired.
• DI disc information
• 'one cluster' represents a minimum record unit, five hundred forty-four clusters gather to construct one fragment as one upper record unit, and total five fragments gather to form the PIC area.
• Disc information is recorded in a front head cluster of a first fragment IFO.
• the disc information is plurally recorded per recording layer and writing speed permitted by the corresponding optical disc, and one disc information includes one hundred twelve bytes.
• disc information constructed with 112-bytes is called disc information (DI) frame.
• DI disc information
• the same contents of the disc information are repeatedly recorded in each front head cluster of the rest of the fragments, thereby enabling to cope with loss of the disc information.
• Information representing the corresponding recording layer, information representing writing speed, and write strategy information corresponding to the writing speed are recorded within each disc information. Hence, such information is utilized in the recording or reproducing of the corresponding optical disc, thereby enabling to provide optimal write power per recording layer and per writing speed.
• FIGs . 4 to 12 Various embodiments for a method of recording a write strategy (WS) associated with a disc information type within disc information according to the present invention are explained in detail by referring to FIGs . 4 to 12 as follows.
• WS write strategy
• FIG. 4 is a diagram of recording disc information of an optical disc according to one embodiment of the present invention, in which a disc information structure is schematically shown.
• a plurality of disc information are recorded within a disc, a record sequence of each disc information is decided by a sequence number, and the record sequence is recorded by 1-byte.
• the corresponding information is recorded in 5 th byte ' within the disc information, which is named 'DI frame sequence number in DI block' field and is briefly indicated by 'OOh, Olh, 02h, 03h ...' .
• 'OOh' it means 1 st disc information.
• the information of the 5 th byte is '07h'
• the meaning of 'DI frame sequence number in DI block' of the 5 th byte can be defined in a following manner. First of all, if the information of the 5 th byte is
• 'OOh' means 1 st disc information as -well as disc information of lx speed of a first recording layer LayerO.
• 'Olh' means 2 nd disc information as well as disc information of 2x speed of the first recording layer LayerO.
• '02h' means 3 rd disc information as well as disc information of 4x speed of the first recording layer LayerO.
• '03h' means 4 th disc information as well as disc information of 8x speed of the first recording layer
• the recording layer information and the writing speed information can be separately recorded in a reserved area within disc information.
• identification information enabling to identify a type or kind of the disc information is recorded in a specific area of N th byte, which is named 'DI Type' field, within the disc information.
• a write strategy (WS) interoperating with the type of the corresponding disc information is recorded in another specific area, e.g., area named 'Write Strategy parameters' field as L th ⁇ lll th bytes, within the disc information.
• the write strategy (WS) is recorded in a manner fitting the identified mode. For instance, if it is the CLV mode, a WS for one recording velocity is recorded only. If it is CAV mode, it is necessary to record a WS for one type recording velocity group (e.g., three kinds of linear velocities such as lx, 1.7x, and 2.4x) . And, if the information identifying the disc information type is '0000 0000b' for example, it means to define
• FIG. 5 shows an exemplary method of recording disc information in case of recording identification information for identifying a disc information type in Nth byte within the disc information like FIG. 4, in which one recording layer LayerO is shown for convenience of explanation. And, it is a matter of course that the method can be applied in the same manner even if there exist more recording layers.
• the disc information of the present invention is information that a disc manufacturer records characteristics of a corresponding disc in a prerecorded area within the disc.
• a write strategy (WS) the disc has is defined so that a recording/reproducing apparatus (FIG. 12) can utilize it in the practical application of the recording/reproducing.
• a disc manufacturer preferentially decides an applicable writing speed per recording layer and then records identification information indicating whether the decided writing speed corresponds to the CLV or CAV method in the N th byte.
• the write strategy (WS) interworking with the identification information is identified according to a CLV or CAV mode to be recorded in L th ⁇ lll th bytes.
• disc information for lx speed of 1 st recording layer is recorded in 'OOh' as a disc information sequence
• a disc information type means a CAV mode
• a write strategy (WS) interworks with it so that a CAV WS is selected to be recorded.
• Disc information for 2x speed of 1 st recording layer is recorded in 'Olh', a disc information type means a CLV mode, and a write strategy (WS) interworks with it so that a CLV WS is selected to be recorded.
• Disc information for 4x speed of 1 st recording layer is recorded in '02h', a disc information type means a CLV mode, and a write strategy (WS) interworks with it so that a CLV WS is selected to be recorded.
• Disc information for 8x speed of 1 st recording layer is recorded in '03h', a disc information type means a CAV mode, and a write strategy (WS) interworks with it so that a CAV WS is selected to be recorded.
• the CLV or CAV WS means one write strategy (WS) selected by a disc manufacturer.
• the write strategy will be applied to one kind writing speed.
• the write strategy will be applied to a plurality of writing speeds for one type writing speed or recording velocity group.
• FIG. 6 is a diagram of recording control information according to another embodiment of the present invention. Compared to the embodiment in FIG. 4, FIG. 6 shows that specific identification for CAV mode is subdivided to be applied to 'DI Type' field written in N th byte within disc information. Namely, in case that corresponding disc information means CAV mode, this is subdivided to identify how many velocities are provided by a write strategy (WS) .
• WS write strategy
• 'DI Type' field can be defined as follows. If 'DI Type' field recorded in N h byte is '0000 0001b', it means CAV mode and a write strategy (WS) recorded in L th ⁇ lll th bytes is recorded to correspond to one kind of velocity only. If 'DI Type' field recorded in N th byte is '0000 0010b', it means CAV mode and a write strategy (WS) recorded in L th ⁇ lll th bytes is recorded to correspond to two kinds of velocities. If 'DI Type' field recorded in N h byte is '0000
• L th ⁇ lll h bytes is recorded to correspond to three kinds of velocities.
• FIG. 7 is a diagram of recording control information according to a further embodiment of the present invention, in which information for identifying a type of disc information is recorded within disc information like the embodiment in FIG. 4 together with another information enabling to identify a type of write strategy (WS) finally used.
• the information enabling to identify a write strategy (WS) type is to identify which one of a plurality of specified write strategies (WS) was selected to be used by a disc manufacturer, whereas the information for identifying a disc information type enables to identify whether corresponding disc information is in CLV mode or CAV mode.
• various write strategy types which can exist such as (n-1) WS, n/2 WS, etc., are defined as 1 st WS WS-1, 2 nd WS WS-2,... and K h WS WS-K.
• the information identifying the write strategy type (named 'WS Type' ) selected by a disc manufacturer is recorded within disc information.
• 'Write Strategy (WS) Type' field is added to P th byte of the embodiment in FIG. 4 so that L th ⁇ lll th write strategy (WS) is recorded by interworking with a disc information type in N th byte and a write strategy (WS) type in P th byte.
• WS write strategy
• FIG. 8 is a diagram of recording a write strategy within control information according to the further embodiment of the present invention in FIG. 7, and FIG. 9 is a diagram of another example of recording a write strategy within control information according to the further embodiment of the present invention in FIG. 7.
• FIG. 8 shows that a disc manufacturer optionally records a specific write strategy (WS) for entire writing speeds in recording one of a plurality of write strategies (WS) .
• WS specific write strategy
• N th byte of disc information indicates a disc information type
• P th byte of disc information indicates a write strategy (WS) type
• parameters associated with one write strategy (WS) decided by interworking with the N h and P h bytes are recorded in L th ⁇ ll fch bytes.
• disc information for lx speed of 1 st recording layer is recorded in 'OOh' as a disc information sequence
• a disc information type means a CAV mode
• a write strategy (WS) type means 1 st WS WS-1
• Disc information for 2x speed of 1 st recording layer is recorded in 'Olh'
• a disc information type means a CLV mode
• a write strategy (WS) type means 1 st WS WS-1
• Disc information for 4x speed of 1 st recording layer is recorded in '02h', a disc information type means a CLV mode, a write strategy (WS) type means 2 nd WS WS-2, and a write strategy (WS) interworks with them so that a CLV WS-2 is selected to be recorded.
• Disc information for 8x speed of 1 st recording layer is recorded in '03h', a disc information type means a CAV mode, a write strategy (WS) type means 2 nd WS WS-2, and a write strategy (WS) interworks with them so that a CAV WS-2 is selected to be recorded.
• FIG. 9 shows that one of a plurality of write strategies (WS) is recorded within disc information, in which a mandatory write strategy (WS) type is recorded for a specific specified writing speed (e.g., lx speed) but a disc manufacturer optionally records a specific write strategy (WS) for the rest writing speeds .
• a write strategy (WS) type is decided in a mandatory manner by putting limitation on disc manufacturer' s options for a specific writing speed (lx speed) . This enables a manufacturer of a disc recording/reproducing apparatus (FIG. 12) to design to manufacture inexpensive products coping with one write strategy (WS) type only.
• disc information for lx speed of 1 st recording layer is recorded in 'OOh' as a disc information sequence
• a disc information type means a CAV mode
• a write strategy (WS) type means 1 st WS WS-1
• Disc information for 2x speed of 1 st recording layer is recorded in 'Olh'
• a disc information type means a CLV mode
• a write strategy (WS) type means 1 st WS WS-1
• Disc information for 4x speed of 1 st recording layer is recorded in '02h'
• a disc information type means a CLV mode
• a write strategy (WS) type means 2 nd WS WS-2
• Disc information for 8x speed of 1 st recording layer is recorded in '03h'
• a disc information type means a CAV mode
• a write strategy (WS) type means 2 nd WS WS-2
• FIG. 10 is a diagram of recording control information according to another further embodiment of the present invention, in which specific identification for CAV mode is subdivided to be applied to 'DI Type' field written in N th byte within disc information and in which information designating a write strategy (WS) type is recorded as well .
• corresponding disc information means CAV mode
• this is subdivided to identify how many velocities are provided by a write strategy (WS) .
• WS write strategy
• 'DI Type' field recorded in N th byte is '0000 0001b', it means CAV mode and a write strategy (WS) recorded in L th ⁇ lll th bytes is recorded to correspond to one kind of velocity only. If 'DI Type' field recorded in N th byte is '0000 0010b', it means CAV mode and a write strategy (WS) recorded in L th ⁇ lll th bytes is recorded to correspond to two kinds of velocities. If 'DI Type' field recorded in N th byte is '0000 0011b', it means CAV mode and a write strategy (WS) recorded in L th ⁇ lll th bytes is recorded to correspond to three kinds of velocities .
• 'Write Strategy (WS) Type' field is added to P th byte within disc information so that L th ⁇ lll th write strategy (WS) is recorded by interworking with a disc information type in N th byte and a write strategy (WS) type in P th byte.
• WS write strategy
• it can be defined as follows. If '0000 0000b' is written in P th byte, it means 1 st WS WS-1. If '0000 0010b' is written in P th byte, it means 2 nd WS WS-2. And, if 'XXXX XXXXb' is written in P th byte, it means K th WS WS-K.
• FIG. 11 is a diagram of recording a write strategy within control information according to another further embodiment of the present invention in FIG. 10.
• '0000 0000b' is written in 'DI Type' field of N th byte to mean CLV mode.
• '0000 0001b' is written in 'Write Strategy (WS) Type' field of P th byte to mean 1 st WS WS-1.
• 5 th byte is 'OOh' to mean lx speed disc information of 1 st recording layer.
• P th bytes is written in Lth ⁇ lll th bytes within a disc.
• WS' type are defined for example. Accordingly, a disc manufacturer records an optimal value in a corresponding disc.
• FIG. 12 is a block diagram of an optical disc recording/reproducing apparatus according to the present invention.
• a recording/reproducing apparatus according to the present invention includes a recorder/reproducer 10 carrying out recording/reproducing on an optical disc and a control unit 20 controlling the recorder/reproducer 10.
• the control unit 20 gives a record or playback command-, for a specific area, and the recorder/reproducer 10 caries out the recording/reproducing on the specific area according to the command of the control unit 20.
• the recorder/reproducer 10 includes an interface unit 12 performing communications with an external device, a pickup unit 11 directly recording data on the optical disc or reproducing the data, a data processor 13 receiving a playback signal from the pickup unit 11 to restore into a necessary signal value or modulating to deliver a signal to be recorded into a signal to be recorded on the optical disc, a servo unit 14 reading out a signal from the optical disc correctly or controlling the pickup unit 11 to record a signal on the optical disc correctly, a memory 15 temporarily storing management information including control information and data, and a microcomputer 16 responsible for controlling the above-described elements within the recorder/reproducer 10.
• a disc information recording process of an optical disc according to the present invention is explained in detail as follows .
• the entire disc management information within the disc is read out to be temporarily stored in the memory 15 of the recorder/reproducer 10.
• various kinds of the disc management information are utilized for the recording/reproducing of the optical disc.
• the management information stored in the memory 15 includes disc information of the present invention.
• information for identifying a disc information type recorded within disc information, identification information for identifying a write strategy (WS) , and write strategy parameter values interworking with them are read out to be temporarily stored in the memory 15.
• the control unit 20 renders such an intent into a writing command and then delivers it to the recorder/reproducer 10 together with data for writing location information to be recorded.
• the microcomputer 16 decides the corresponding writing speed applied to an area within the optical disc from the management information (specifically via disc information) stored in the memory 15 and then performs the writing command by finding optimal write power by referring to a write strategy (WS) corresponding to the decided writing speed.
• WS write strategy
• the present invention provides various methods of providing control information coping with higher writing speed in a high-density optical disc. Specifically, in recording a write strategy (WS) within disc information, CLV and CAV are separately recorded, whereby it is able to efficiently cope with the record/playback of the optical disc.

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• Engineering & Computer Science (AREA)
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• Computer Security & Cryptography (AREA)
• Optical Recording Or Reproduction (AREA)
• Signal Processing For Digital Recording And Reproducing (AREA)
• Optical Head (AREA)
• Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
• Pinball Game Machines (AREA)
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