Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2001-02-16
2003-07-15
Edun, Muhammad (Department: 2653)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S275100, C369S044260, C369S047100
Reexamination Certificate
active
06594224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical disc and a method of and an apparatus for recording a signal onto the optical disc, which is especially suitable for a DVD-RW (DVD Re-recordable).
2. Description of the Related Art
There are various types of optical discs because of the diversification of formats of the CDs (Compact Discs) and the introduction of the DVD.
According to the formats of the CDs, there are a read only type CD-ROM (CD-Read Only) on which data can be read many times but cannot be written, a write once type CD-R (CD-Recordable) on which data can be read many times and can be written only once, and a CD-RW (CD Rewritable) on which data can be read many times and can be written many times. According to the formats of the DVDs, there are a read only type DVD-ROM (DVD Read Only) on which data can be read many times but cannot be written, a write once type DVD-R (DVD-Recordable) on which data can be read many times and can be written only once, a re-recordable type DVD-RW (DVD Re-recordable) on which data can be read many times and can be written for limited times, and a rewritable type DVD-RAM (DVD Rewritable) on which data can be read many times and can be written many times.
FIG. 13
shows an example of a data structure and allocations of addresses in a lead in area in the format of the DVD-RW.
In
FIG. 13
, an initial zone having 3078 ECC blocks is allocated from an ECC block address of “0022FA”h, which is a start position of the lead in area belonging to a readable emboss data zone, where data cannot be rewritten. In this initial zone, all “00”h data are set which imply a blank. A reference code zone having 2 ECC blocks is allocated from the ECC block address “002F00”h following this emboss data zone. In this reference code zone, an emboss reference code is recorded. More concretely, a code within a conversion table set in advance as the emboss reference code is repeated. The apparatus is set such that this predetermined code word can be correctly read out, in other words, the code word can be read out within a predetermined error rate range. Following to this reference code zone, a first buffer zone having 30 ECC blocks is allocated in which all data “00”h are set which imply a blank again from the ECC block address “002F02”h.
A control data zone having 192 ECC blocks is allocated which starts from the next ECC block address “002F20”h. In this control data zone, control data, which is essentially composed of 16 sectors (i.e., 1 ECC block), and has (i) a physical format information explained below (of 1 sector), (ii) a disc production information area (of 1 sector) and (iii) an empty information area (of 14 sectors), is recorded repeatedly by 192 times. Here, as the physical format information, there are recorded the type of the applied DVD standard (e.g., the DVD-ROM, the DVD-RAM, the DVD-RW or the like), the part version, the disc size, the minimum read out rate, the disc structure (e.g., one layer ROM disc, one layer RAM disc, two layers ROM/RAM disc or the like), the record density, the data area allocation, the condition of linear velocity to specify the exposure light amount at the time of recording in the burst cutting area, the reading out power, the peak power, the bias power, various information with regard to the production of the medium and so on. In the empty information area, important data such as copy right protection information or the like is recorded at an arbitrary position therein.
According to the DVD-RW standard, in order to prevent an illegal rewriting operation, emboss pits are randomly formed (buried) in the control data zone consisting of 192 ECC blocks, so that the control data cannot be read out or recorded in this control data area as the unreadable emboss area. Incidentally, according to the DVD-RW standard, the control data is recorded at a different position.
As described above, the control data zone is recorded as a zone where the data cannot be read out or recorded, according to the DVD-RW standard. However, a development of such an optical disc (i.e., the DVD-RW) is demanded that the data cannot be written but the data can be read in the control data zone, which is at the same position as in the case of the DVD video (or the DVD-ROM), so as to enable the reproduction of the DVD-RW by a DVD video player.
However, if the emboss pit is recorded as the data actually readable in the same manner as the CD, the data in the control data zone cannot be read due to the existence of a land pre-pit (indicating a guide signal) on a land portion according to the DVD-RW standard. The land pre-pit signal is necessary to write data to a next area on the DVD-RW. Thus, the land pre-pit cannot be omitted, and thereby data cannot be written by the readable emboss pit in the control data zone as a result.
In this manner, if it is attempted to record data in the control data zone by the emboss pit, since the land pre-pit signal with an adequate signal quality cannot be obtained, it is difficult or impossible to record data into an area immediately after the control data zone, which is a problem.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an optical disc, and a method of and an apparatus for recording a signal onto the optical disc, which enables to record data into the area immediately after the control data zone and which preserves the compatibility with a conventional optical disc.
The above object of the present invention can be achieved by an optical disc provided with: a disc substrate; an information track formed on the disc substrate spirally or coaxially around a center of the disc substrate, on which an information signal including a physical sector number is to be recorded; and a guide track adjacent to the information track and formed on the disc substrate spirally or coaxially around the center, on which a guide signal including address information is to be recorded, wherein a readable emboss area, in which the information signal is recorded by an emboss pit, and an unreadable emboss area, in which an unreadable emboss pit to disable writing and reading the information signal, are formed on the information track, and the guide signal is not recorded on the guide track corresponding to the readable emboss area and the guide signal is recorded on the guide track corresponding to the unreadable emboss area.
The above object of the present invention can be also achieved by another optical disc provided with: a disc substrate; an information track formed on the disc substrate spirally or coaxially around a center of the disc substrate, on which an information signal including a physical sector number is to be recorded; and a guide track adjacent to the information track and formed on the disc substrate spirally or coaxially around the center, on which a guide signal including address information is to be recorded, wherein a readable emboss area, in which the information signal is recorded by an emboss pit, and an unreadable emboss area, in which an unreadable emboss pit to disable writing and reading the information signal, are formed on the information track, and the guide signal is recorded on the guide track except the guide track corresponding to the readable emboss area.
In one aspect of the optical disc of the present invention, the unreadable emboss area is disposed immediately after the readable emboss area.
In another aspect of the optical disc of the present invention, the address information of the guide signal corresponding to the unreadable emboss area is set on the basis of the address information of the guide signal corresponding to a lead of a data record area of the optical disc.
According to the optical disc of the present invention, it becomes possible to record data into an area immediately after the unreadable emboss area, and an optical disc on which the data cannot be written into the control data zone and the data can be read out in the control data zone can be realized. Further, by adjusting the inconformity of the a
Kato Masahiro
Kuroda Kazuo
Muramatsu Eiji
Oishi Masami
Taniguchi Shoji
Edun Muhammad
Pioneer Corporation
LandOfFree
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