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
  • G11B7/007—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
  • 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
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
• • 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
  • 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
  • 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
• • 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
  • G11B2220/23—Disc-shaped record carriers characterised in that the disc has a specific layer structure
  • G11B2220/235—Multilayer discs, i.e. multiple recording layers accessed from the same side
• • 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

Definitions

• the present invention relates to a recording medium, such as optical disc, and a method of recording disc control information in a recordable optical disc including at least one recording layer, and more particularly, to a method of recording information indicating a specific location of disc control information within the disc control information itself, to a method of searching requested disc control information, and to method of recording data using the disc control information recorded in a specific area of the recordable optical disc.
• a high density optical recording medium known as HD-DVD
• the Blu-ray disc represents next-generation HD-DVD technology.
• the present invention is directed to an disc control information recording method that substantially obviates one or more problems due to limitations and disadvantages of the related art.
• a method of recording a control information of recording medium includes the step of generating a control information, the control information including at least one or more information unit associated with a specific writing speed and recording layer, wherein an information unit including a first pointer designating a location of information unit of an applicable writing speed and/or a second pointer designating a location of information of an applicable recording layer, and recording the at least one or more information units in a specific area of the recording medium.
• a method of recording disc control information on a recording medium includes the step of generating a control information, the control information including at least one information unit including a write strategy for a specific writing speed, a specific recording layer, a pointer information indicating an information unit associated with a specific writing speed and a specific recording layer, and recording the control information in a specific area of the recording medium.
• a data structure for a control information recorded on a recording medium including at least on recording layer or to be recorded/reproduced on/from the recording medium, characterized in that the control information comprising at least one or more information units, which are located at a specific area of the recording medium, each information unit comprises a location pointer identifying a sequence number thereof according to a specific writing speed and recording layer.
• a recording medium including at least one recording layer provided with a recordable area and a prerecorded area, characterized in that information unit is provided per an applicable recording layer and writing speed within the prerecorded area, wherein an information unit includes a first pointer designating a location of first information unit per the applicable writing speed and second pointer designating a location of information unit of the applicable recording layer.
• an optical disc in another aspect of the present invention, includes at least one or more recording layers wherein an area for recording at least one or more disc control informations per applicable recording layer and writing speed is provided within a management area of the optical disc, wherein a common pointer information is recorded within each of the at least one or more disc control informations, and wherein the common pointer information enables the at least one or more disc control informations to have a same value.
• a method of recording data on an optical disc includes the steps of checking a location of an disc information for a requested writing speed, based on a pointer information, wherein the pointer information including first pointer designating a location of first disc information per applicable writing speed, and recording data on a specific area of the recording medium based on at least the disc information designated by the first pointer.
• an optical disc recording/reproducing apparatus includes an optical pickup reading a plurality of disc control informations separately written per recording layer and per writing speed within a management area of an optical disc, each disc control information include a location information to designate a location of the disc control information associated with a specific writing speed of a specific recording layer and a controller checking the location of the disc control information associated with the specific recording layer and the specific writing speed from the location information read from the optical pickup, and performing a recording using write strategy parameters included within the checked disc control information.
• 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 disc control information of the present invention is recorded, in which a format of recording the disc information in a corresponding area is schematically shown;
• FIGs. 4A to 4C are diagrams of disc information recorded according to a first embodiment of the present invention;
• FIG. 5 is a diagram of disc information recorded according to a second embodiment of the present invention;
• FIGs. 6A to 6O are diagrams of disc information recorded according to a third embodiment of the present invention;
• FIG. 7A and FIG. 7B are diagrams of disc information recorded according to a fourth embodiment of present invention; and
• FIG. 8 is a block diagram of an optical disc recording/reproducing apparatus using disc information according to the present invention.
• the disc control information' of a disc is recorded a specified area, i.e., a recordable area of the disc or (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' in 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.
• FIG. 1 and 2 are illustrates the structure of optical discs according to the present invention, in which any recordable optical disc may applicable to the present invention.
• the recordable disc may be, for example, a rewritable optical disc or a write-once optical disc.
• 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 pre-recorded area and a rewritable or write-once area are provided separately.
• the pre-recorded area is is called PIC area, where permanent information and control data is recorded, and disc information is recorded in the PIC area.
• a data area is made up of a user data area where user data is recorded and inner and outer spare areas ISA and OSA, which are used in the replacement of the data of a defect area.
• TDMA temporary defect management area
• the TDMA is unnecessary in case of BD-RE discs, which • have a corresponding area designated as reserved.
• the present invention intends to provide a method of recording disc information (DI) as disc control information required for recording and/or reproducing of a disc in a pre-recorded or recordable area. It is apparent that a recording method in the pre-recorded area is differently applied to each kind of disc. In case of BD-RE and BD-WO discs, the prerecorded area is PIC area recorded using bi-phased high frequency modulated signal reproduced according to a specific playback method, to acquire the disc information.
• DI disc information
• FIG. 2 illustrates an optical disc having dual recording layers, in which an inner circumference area of the disc has a lead-in of a first recording layer (LayerO) corresponding to a lead-out of a second recording layer (Layerl) .
• LayerO first recording layer
• Layerl second recording layer
• FIG. 3 illustrates a PIC area formatted according to the present invention.
• a minimum record unit is one cluster
• 544 constitute one fragment as one upper record unit
• 5 fragments make up the PIC area.
• Disc information is recorded in a front head cluster of a first fragment IF0.
• the disc information is plurally recorded per recording layer and writing speed permitted by the corresponding optical disc.
• One disc information includes 112 bytes, sometimes referred to as a disc information
• DI digital image
• the same contents of the disc information are repeatedly recorded in each front head cluster of the remainder of the fragments .
• Information representing the corresponding recording layer, information representing writing speed, and write strategy information corresponding to the writing speed are included in each disc information. Such information is utilized in recording and reproducing the optical disc, to provide optimal write power per recording layer and per writing speed.
• a location information which may be called ⁇ DI frame pointer' , of each of the disc informations needs to be recorded.
• ⁇ DI frame pointer' a location information, which may be called ⁇ DI frame pointer' , of each of the disc informations needs to be recorded.
• DI frame pointer the location information of the corresponding disc information (DI frame pointer) enables to overcome such an inconvenience.
• FIGs. 4A to 4C are diagrams of disc information recorded according to a first embodiment of the present invention.
• FIG. 4A shows a structure of disc information for explaining a first embodiment of the present invention.
• a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.
• the information is' recorded in 5 th byte within disc information, is named ⁇ DI frame sequence number in DI block' , and is briefly represented by 'OOh, Olh, 02h, ...' .
• the information of the 5 th byte is ⁇ 00h', it means 1 st disc information.
• the information of the 5 th byte is 'I ⁇ h', it means 16 th disc information.
• the present invention is characterized in that the DI frame pointer is decided by a combination of information designating a location of 1 st disc information per writing speed (per speed offset pointers written in N th and (N+l) th bytes) and information designating a location of disc information associated with a recording layer having each writing speed applied thereto (Layer 0, 1, 2, and 3 pointers written in M th and (M+l) th bytes).
• the informations are recorded in separate areas, respectively.
• the present invention is characterized in that the information designating the location of the 1 st disc information per writing speed as 5 th byte information among the disc informations is recorded by the same expression of information representing the sequence of the corresponding disc information in the form of a sequence of the corresponding disc information (ex., 00h', x 03h', etc.) and that the information designating the location of the disc information associated with the recording layer having each writing speed applied thereto designates a number (offset) added in 1 st location information per the corresponding writing speed.
• the applicable writing speed in the first embodiment of the present invention shown in FIG. 4A is represented by lx speed (IX) , 2x speed (2X) , 3 rd speed (3 rd X) , or 4 th speed (4 th X) .
• the 3 rd speed (3 rd X) and the 4 th speed (4 th X) can be defined to designate 4x speed and 6x speed, respectively.
• a specific byte N th or (N+l) h byte
• a location of 1 st disc information per applicable writing speed is written in each 4-bits.
• the location of the 1 st disc information per applicable writing speed is equal to the information of the sequence of the disc information recorded in the 5 th by e. Since 2 -bytes (N h and (N+l) th bytes) are allocated, it is able to represent total four writing speeds. If there exist five or more different writing speeds, more bytes such as like N th byte, (N+l) th byte, (N+2) th byte, and the like are added thereto. Besides, another method of extending bytes is explained later in detail in a second embodiment of the present invention shown in FIG. 5.
• Location information of a recording layer to which each writing speed is applied is recorded in another byte (M th or (M+l) th byte) within disc information to designate the number (offset) added in the 1 st disc information per writing speed. Namely, through the above-explained method, it is able to represent both of the location of the 1 st disc information per writing speed and the location of the recording layer applied per the corresponding writing speed, whereby the entire locations of sixteen disc informations can be represented by total 4-bytes.
• the location information indicating a specific or one disc information is represented by simply allocating 1-byte to a reserved area within disc information. If there are sixteen disc informations, 16-bytes are needed. Hence, it is able to overcome the problem of extending future specifications in designating location informations of the entire disc informations.
• FIG. 4B shows an example of representing location informations of sixteen disc informations according to the first embodiment of the present invention in case of four writing speeds and four different recording layers per writing speed, in which 3 rd and 4 th writing speeds are set to 4x speed and 6x speed, respectively.
• N th and (N+l) th bytes a previously promised location of 1 st disc information per writing speed is represented by allocated 4- bits.
• v 0000b' as upper 4-bits of the N h byte has a meaning of designating a location of 1 st disc information for lx speed to become a disc information corresponding to a sequence number of v 00h' . 0100b' as lower 4-bits of the N th byte has a meaning of designating a location of 1 st disc information for 2x speed to become a disc information corresponding to a sequence number of v 04h'.
• v 1000b' as upper 4-bits of the (N+l) th byte has a meaning of designating a location of 1 st disc information for 4x speed to become a disc information corresponding to a sequence number of l 08h'.
• '1100b' as lower 4-bits of the (N+l) h byte has a meaning of designating a location of 1 st disc information for 6x speed to become a disc information corresponding to a sequence number of x 12h' .
• M th and (M+l) t bytes the information designating a location of a recording layer having each writing speed applied thereto is recorded.
• the embodiment of the present invention supports total four recording layers (Layer 0, Layer 1, Layer 2, and Layer 3) .
• ' 0000b' as upper 4-bits of the M th byte designates a location of 1 st recording layer L0 per writing speed.
• ' 0001b' as lower 4-bits of the M th byte designates a location of 2 nd recording layer Ll per writing speed.
• ⁇ 0010b' as upper 4-bits of the (M+l) th byte designates a location of 3 rd recording layer L2 per writing speed.
• the recording layer information means a number (offset) added in each 1 st location information per writing speed. For instance, if the recording layer location information is '0000b' (LO) , the number (offset) to be added is
• the recording layer information means the corresponding 1 st disc information per writing speed.
• the recording layer location information is '0010b' (L2) , the number
• a location of 1 st disc information for 4x speed is checked from upper 4-bits of (N+l) th byte ('08h') and a location of a recording layer for the corresponding writing speed is then checked from upper 4-bits of (M+l) th byte.
• the location of the disc information to be finally searched becomes the disc information having the sequence number of 'llh' .
• FIG. 4C shows an example of representing disc information location information according to the first embodiment of the present invention in FIG. 4A if total eight different disc informations exist in case of two recording layers and four different writing speed informations per recording layer.
• the detailed representing method is the same as described in FIG. 4B, thereby being skipped in the following description.
• the present embodiment relates to the case that there exist two recording layers only, whereby the (M+l) th byte having the information of 3 rd and 4 th recording layers is unnecessary to be set to '1111b'. If information of '1111b' is detected, a system recognizes that the corresponding recording layer fails to exist.
• FIG. 5 is a diagram of disc information recorded according to a second embodiment of the present invention, which is applicable to a case that a concept of the first embodiment of the present invention in FIG. 4A is extended to add more writing speeds or recording layers.
• the first embodiment of the present invention relates to a method of designating a location of disc information designating maximum four recording layers and maximum four different writing speeds per recording layer. If the number of the recording layers or writing speeds exceeds five, the first embodiment of the present invention becomes unable to represent them. Therefore, the second embodiment according to the present invention allocates more bytes to disc information to overcome such a problem.
• a group of initial 4-bytes N, (N+l) , M, and (M+l) is named 1 st group field and another group of additional 4-bits X, (X+l) , Y, and (Y+l) is named 2 nd group field.
• a recording method of the 2 nd group field which is performed in the same manner of the 1 st group field, is decided by recording information designating a location of 1 st disc information per additional writing speed (offset pointers for 5 th ⁇ 8 th writing speeds written in X th and (X+l) th bytes) and information designating a location of disc information associated with additional recording layers having each writing speed applied thereto (Layer 4, 5, 6, and 7 pointers written in Y th and (Y+l) th bytes) in separate areas, respectively and by a combination of the recorded informations .
• 1 st and 2 nd group fields is recorded in a reserved area within disc information by 1-byte. For instance, by utilizing L th byte within disc information, the information is named 'using byte for DI frame pointer'.
• a main field is set to '0000 0000b' in case that location information of disc information is designated using the 1 st group field [N th , (N+l) h , M th , and (M+l) th bytes] only.
• the main field is set to '0000 0001b' in case that location information of disc information is designated using both of the 1 st group field [N th , (N+l) th , M th , and (M+l) th bytes] and the 2 nd group field [X th , , (X+l) th , Y th , and (Y+l) th bytes]. Hence, it is able to confirm the bytes (group field) for the currently used location information.
• FIGs. 6A to 6D are diagrams of disc information recorded according to a third embodiment of the present invention, in which intrinsic 'recording layer information' and 'writing speed information' are recorded within disc information as location information.
• a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.
• the information is recorded in 5 th byte within disc information, is named 'DI frame sequence number in DI block' , and is briefly represented by 'OOh, Olh, 02h, ...' .
• the information of the 5 th byte is 'OOh', it means 1 st disc information.
• the information of the 5 th byte is '07h', it means 8 th disc information.
• recording layer information and writing speed information which are to be used by the corresponding disc information, are represented by specific bits to be recorded in a specific area (K th byte) within disc information.
• recording layer information is recorded in upper 4- bits of the K th byte and writing speed information is recorded in lower 4-bits of the K th byte.
• the recording layer in formation can be defined as follows. If the recording layer information is '0000b', it means 1 st recording layer L0. If the recording layer information is '0001b', it means 2 nd recording layer Ll . If the recording layer information is '1111b', it means 16 th recording layer L15.
• the writing speed information can be variously defined. For instance, if the writing speed information is '0000b', it means 1 st recording layer L0. If the recording layer information is '0001b', it means 2 nd recording layer Ll . If the recording layer information is '1111b', it means 16 th recording layer L15.
• the writing speed information can be variously defined. For instance, if the writing speed information is '0000b', it means
• such a defining method of recording layer or writing speed information can be variously defined according to a system or via specification establishment. Besides, it is also possible to define the recording layer or writing speed information by allocating 1-byte thereto.
• FIG. 6B shows an example of disc information recorded according to a third embodiment of the present invention, in which location information of disc information is represented by a combination of the first and second embodiments of the present invention.
• disc information is very important information including writing speed information of a corresponding disc and a write strategy (WS) coping with a writing speed and requires high reliance.
• WS write strategy
• the methods according to the first and second embodiments of the present invention are recorded to enable to apply a specific embodiment of the present invention to designing a recording/reproducing apparatus (FIG. 8), thereby enabling to provide flexibility of implementation additionally.
• intrinsic 'recording layer information' and 'writing speed information' of a corresponding disc information are recorded in K th byte within disc information.
• 'Pointer information' is recorded in N th ⁇ (N+l) th , M th ⁇ (M+l) th , X th ⁇ (X+l) th , and Y th ⁇ (Y+l) th bytes in the same manner of the second embodiment of the present invention in FIG. 5.
• FIG. 6C shows an example of disc information using the example in FIG.
• FIG. 6C specifically shows a sequence number '04h' as 5th disc information among the thirty-two disc informations .
• common 'pointer information' is recorded in the entire disc informations, in N th ⁇ (N+l) th , M h ⁇ (M+l) th , X th - (X+l) h , and Y th ⁇ (Y+l) h bytes.
• the Y th ⁇ (Y+l) th bytes for representing additional recording layer (s) are not used and are set to '1111b' each.
• K th byte within the disc information having the sequence number of '04h' recording layer and writing speed informations meant by the corresponding disc information are recorded as intrinsic information of the corresponding disc information are recorded.
• the disc information of '04h' is 2x speed associated disc information of 1 st recording layer
• upper 4-bits of 7 th byte is '0000b' to indicate 1 st recording layer L0
• lower 4-bits thereof is '0001b' to directly record information indicating 2x speed.
• the recording/reproducing apparatus in FIG. 8 enables to confirm or verify again that the corresponding disc information is related to '1 st recording layer 2x speed' from K th byte within the '04h' disc information found from the 'pointer information' .
• FIG. 6D shows an example of disc information using the example in FIG. 6B, in which total thirty-two disc informations associated with eight kinds of writing speeds and four recording layers exist within a disc. And, FIG. 6D specifically shows a last sequence number '31h' among the thirty-two disc informations.
• FIG. 7A and FIG. 7B are diagrams of disc control information recorded according to a fourth embodiment of present invention.
• FIG. 7A shows a structure of disc information to explain a fourth embodiment according to the present invention.
• a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.
• the information is recorded in 5 th byte within disc information, is named 'DI frame sequence number in DI block' , and is briefly represented by 'OOh, Olh, 02h, ...' . Namely, . if the information of the 5 th byte is 'OOh', it means 1 st disc information. If the information of the 5 th byte is '07h' , it means 8 th disc information.
• a fourth embodiment according to the present invention is characterized in that a specific recording layer is combined with a specific writing speed to indicate one location information.
• four writing- speed informations for 1 st recording layer L0 are recorded in specific bytes N and (N+l) within disc information by allocating 4-bits to each of the four writing speed informations
• four writing speed informations for 2 nd recording layer Ll are recorded in specific bytes M and (M+l) within disc information by allocating 4-bits to each of the corresponding four writing speed informations.
• a location of the corresponding disc information is directly designated by 4-bits, whereby location informations for eight disc informations can be represented by N th , (N+l) th , M th , and (M+l) th bytes (total 4-bytes) .
• Such a method according to the fourth embodiment of the present invention in which eight disc informations are designated by 4- bytes, is advantageous in that a location of disc information can be directly represented without combination of different informations despite having byte efficiency lower than that of the first or second embodiment of the present invention.
• FIG. 7B shows an exemplary method of representing each location information of total 8 disc informations, in which two recording layers and four different writing speed informations per recording layer exist. Namely, information corresponding to a sequence of the corresponding disc information is recorded as location information in a location previously determined per recording layer and per writing speed in N th , (N+l) th , M th , or (M+l) th byte within disc information.
• the pointer designating a location of disc control information per an applicable writing speed is considered at first, and then the pointer designating a location of information of an applicable recording layer is considered.
• the pointer designating a location of information of an applicable recording layer may be considered first if the disc control information is configured in order of disc control information for an applicable recording layer and applicable writing speed within the same recording layer. Also, it is possible to search the related disc control information using DI frame sequence number of byte 5 if each disc control information includes an information indicating total applicable writing speed and total applicable recording layer.
• the applicable writing speed is four kinds of writing speeds, and the applicable recording layer includes two layers
• total disc control information need sixteen of disc control information.
• an disc control information to be searched is "second applicable writing speed and second recording layer”
• the related disc control information "03h” or "05h”, depending on a first order per writing speed or per recording layer, may be searched using the DI frame sequence number because the DI frame sequence number is increased in ascending order from "OOh” .
• FIG. 8 is a block diagram of a recording/reproducing apparatus of an optical disc according to the present invention.
• a recording/reproducing apparatus 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 disc control information and data, and a microcomputer 16 responsible for controlling the above-described elements within the recorder/reproducer 10.
• 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
• a disc information searching 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. And, 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. Hence, the recording layer information, writing speed information, and write strategy fitting the corresponding writing speed recorded within the disc information are read out to be temporarily stored in the memory 15.
• control unit 20 If intending to perform a recording on a specific area within the optical disc, 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. After receiving the writing command, the microcomputer
• the microcomputer since location information of disc information is recorded within all disc information, the microcomputer enables to recognize locations informations of the entire disc informations by reading any one of the disc informations to facilitate to acquire the disc information associated with the requested writing speed information of the requested recording layer. Namely, in case that a plurality of disc informations exist, it is able to reduce a load of time taken for the memory to search the entire disc informations. Therefore, for the writing command of the control unit 20, the recorder/reproducer acquires the location-confirmed disc information whenever necessary, thereby enabling to perform the writing command at high speed using write strategy parameters recorded within the disc information.
• the present invention provides various methods of providing disc control information coping with higher writing speed in a high-density optical disc, thereby enabling to uniformly apply the standardized disc control information to efficiently cope with the record/playback of the optical disc and to efficiently search a plurality of disc informations.

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