iddresses in a lead m 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 stait position of the lead m 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 cata zone. in this reference code zone, an emboss reference code is recorded More concretely, a code within a ronversion table -et in advance as the emboss reference code is repeated. The apparatus' i- -et -ucn that this predetermined coue word can be correctly read out m ~'ther word- ;he code word can e 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 i= allocated which starts from the next ECC block address 002F20"h. in this control data zone. :ontrol data, which is essentially composed of 1G sectors u.e . 1 ECC block;. and has (1) a physical format information explained below iof 1 sector), (u) a disc production information area (of 1 sector) and (m) 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 »o 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 re-writing 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 DYD-RW standard, the control data is recorded it a different position. As described above trie control data zone is recorded as a zone where the data cannot be read out or recorded, according to the DYD-RW standard. However, a development of such an optical disc 'i.e., the DYD-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 m the case of the DYD video (or the DYD-ROM), so as to enable the reproduction of the DYD-RW by a DYD 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 DYD-RW standard. The land pre-pit signal is necessary to write data to a next area on the DYD-RW. Thus, the land pre-pit cannot be omitted, and thereby data cannot be written by the readable emboss pit m 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 15 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 aisc substrate spirally or coaxially around a center oi 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 15 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 eoaxiaiiy 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 recoraed vn the guide track except tne 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 addresses due to the existence of the unreadable emboss, it is possible to maintain the address compatibility with the disc m the conventional version. The above object of the present invention can be also achieved by a method of recording an information signal and a guide signal onto the above described optical disc of the present invention. The recording method includes a process of forming a readable emboss area, in which the information signal is recorded by an emboss pit. and an unreadable embo?s area m which an unreadable emboss pit to iisable writing and reading the information signal, on the information track and a process of recording the guide signal onto the guide track corresponding '•> tne unreadable emboss area, without recording the guide signal i the suide traned corresponding to tne readable emboss area. The above object of the present invention can be also achieved by another method of recording an information signal and a guide -ignal onto an optical disc comprising ii) a disc -ubstrate. 'n) a.n information track formed on the disc substrate spirally or coaxially around a center of the disc substrate, on which the information signal including a physical sector number is to be recorded and (in) a guide track adjacent to the information track and formed on the disc substrate spirally or coaxially around the center, on which the guide signal including address information is to be recorded. The recording method includes- a process of forming a readable emboss area, in which the information signal is recorded by an emboss pi:, and an unreadable emboss area, m which an unreadable emboss pit to disable writing and reading the information signal, on the information track, and a process of recording the guide signal onto the guide track except the guide track corresponding to the readable emboss area in one aspect of the recording method of the present invention, the unreadable emboss area is disposed immediately after the readable emboss area. in another aspect of the recording method 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 recording method of the present invention. nice the unreadable emboss zone is added between the control data zone as the readable emboss zone and the buffer zone which follows the control data zone, or since the unreadable zone is allocated in one portion of the buffer zone which follows the control data zone or one portion of the control data zone, it becomes possible to record the data into the area immediately after the unreadable zone. Further, since the address of the guide track corresponding to the unreadable area is determined so as to make the physical sector number with the conventional DVD-RW version, it becomes possible to maintain the address compatibility with the disc in the conventional version. As long as there is no interruption or disturbance to the operation of recording the data into the data area following the unreadable emboss zone, it is not required to perform a complicated address operation to maintain the compatibility with the DVD-RW of the conventional version. The above object of the present invention can be also achieved by an apparatus for recording an information >tgnai and a guide signal onto the above described optical disc of the present invention. The recording apparatus includes- an emboss area forming device for forming a readable emboss area, in which the information signal is recorded by an emboss pit. and an unreadable emboss area, m which an unreadable emboss pit to disable writing and reading the information signal, on the information track, and a recording device for recording the guide signal onto the guide track corresponding to the unreadable emboss area without recording the guide signal on the guide track corresponding to tne readable emboss area The above object of the present invention can be also achieved by another apparatus for recording an information signal and a guide signal onto an optical disc comprising (1) a disc substrate, (11) an information track formed on the disc substrate spirally or coaxially iround a center of the disc .-ubstrate. on which the information signai including a physical sector number is to be recorded and (111) a guide track adjacent to the information track and formed on the disc substrate spirally or coaxially around the center, on which the guide signal including address information is to be recorded. The recording apparatus is provided with: an emboss area forming device for forming 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, on the information track, and a recording device for recording the guide signal onto the guide track except the guide track corresponding to the readable emboss area. in one aspect of :he recording apparatus of rhe present invention, the recording device allocates a physical sector address of the unreadable emboss area immediately after the readable emboss area. in another aspect of the recording apparatus of the present invention, the recording device sets the address information of rhe guide signal corresponding to the unreadable emboss area, to a value based on the address information of the guide signal corresponding to a lead of a data record area of the optical disc. According to the recording apparatus of the present invention, -t becomes possible to recora the data into the area immediately alter the unreadable emboss area. The data cannot be written into the control data zone but the data can be read out from the control data zone. By adjusting the inconformity of the addresses due to the allocation of the unreadable emboss, it is possible to maintain the address compatibility with the disc in the conventional version. The nature, utility, and further features of this invention will be more clearly apparent from the following detailed description with respect to preferred embodiments of the invention when read in conjunction with the accompanying drawings briefly described below. BRIEF DESCRIPTION of THE DRAWinGS FIG. 1A is a perspective view of the DVD used in embodiments of the present invention; FIG. IB is a magnified partial perspective view of a transparent substrate of the DVD in FIG. 1A at a portion including record tracks- FIG IC is a partial sectional view of the DVD in FIG. 1A at a portion including the record tracks- FIG. ID is a diagram schematically showing a data structure of the DVD-RW used m the embodiments- FIG. 2A is a diagram showing a positional relationship between a groove and a land of the DVD'RW shown in FIG. ID: FIG 2B is a magnified partial perspective view of the DVD-RYV showing emboss pits- FIG 3 is a diagram showing a detailed structure of a lead in area shown m FIG ID in one embodiment- FIG. 4A is one diagram showing a data structure m a signal record format of the DVD-RW in the embodiments- FIG. 4B is another diagram showing a data structure in the signal record format of the DVD-RW in the embodiments- FIG. 5 is another diagram showing a data structure in the signal record format of the DVD-RW m the embodiments- FIG. 6 is a block diagram showing an internal structure of a disc production apparatus, to which the signal recording method of the present invention is applied, in the embodiments- FIG. 7 is a flowchart showing an operation procedure of a disc production apparatus shown m FIG. 6; FIG. 8 is a process chart showing a method of producing the disc of the embodiment; FIG. 9 is a diagram showing a detailed structure of a lead in area in another embodiment; FIG. 10 1.= a flowchart showing an operation procedure of a disc production apparatus to producing a disc corresponding to FIG 9: FIG. 11 is a diagram showing a detailed structure of a lead m area in another embodiment: FIG. 12 is a flowchart showing an operation procedure of a disc production apparatus to producing a disc corresponding to FIG. 11: and FIG. 13 is a diagram showing a detailed structure of a lead m area as well as an address allocation m a DVD-RW format m a related art. DETAILED DESCRIPTION of THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be now explained. in FIG 1A. a DVD-RW 1 is provided with a transparent substrate 110 having a center hole 103 and record tracks 102 spiral or coaxial around the center hole 103. From the inner circumferential side toward the outer circumferential side on the DVD-RW 1. there are formed'- a clamping area CA which is clamped by a clamper when the DVD-RW 1 is set to an information recording and/or reproducing apparatus; a record information area RIA; and an information area I A. in the information area IA. there are formed a lead in area LIA, a data recordable area DRA and a lead out area LOA in this order from the inner circumferential side. The record tracks 102 are formed in the record information area RIA as well as the information area IA. As shown in FIG. IB. the record tracks 102 consist of d) a land track L comprising a Lino, which is convex on the transparent -ubstrate 110 and is concave with respect to a laser beam LB for a reading operation and/or a writing operation, and . - Description of the Related Art There are various rypes of optical discs because of the diversification if format.- of the CDs ■Compaa discs,1 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 (D\ TJ Read Only) on which data can be read many times but cannot be written, a write once type DVD-R (D\T>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 hmited 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 the ECC block address "003000"h) is set. Namely, to the lead address of the unreadable emboss area, the value (i.e., 002FA0"h) which is obtained by subtracting (1) the 64 ECC blocks (i.e.. '000040"h) as the length of the unreadable emboss area and (11) the 32 ECC blocks l"000020"h) as the length of the buffer zone from the lead address "003000"h as the lead address of the data area is set. FIG. 4A. FIG B and FIG. 5 show the signal record format of the DVD-RAY used m the present embodiment. Here, the physical format upon recording the record information onto the DYD-RW and the error correction process for the record information are explained with reference to those figures At first, the error correction m the DVD-RW and the ECC block as an error correction unit m the error correction process are explained with reference to FIG. 4A and FIG. 4B. The record information recorded on the Dvd-RW is constructed to have a physical structure including a plurality of data sectors 20 shown m FIG. 4A. Then, one data sector 20 includes, in the order from the lead thereof, d) ID information 21 indicating a start position of the data sector 20. (n) an ID information error correction code IEC (ID data Error Correction code) 22 to correct the error in the ID information 21. (in) reserved data 23. (1v) data 24 which is the main data to be recorded and (v) an error detection code EDC (Error Detection Code) 25 to detect an error m the data 24. The record information to be recorded is constructed as a plurality of data sectors 20 are sequentially continued. The ID information 21 is constructed by 4 bytes m total of the sector information having 1 byte and the sector number having 3 bytes. As the sector information, there are a layer to which the -ector number belongs, the area and the like Xext. the process of constructing the ECC block by using the data sector 20 is explained with reference to FIG. 4B. When constructing the ECC block by using the data sector 20. at first, one data sector 20 is divided for each 172 bytes, and the respective divided data (which are referred to as 'data blocks 33" herembelow) are arranged m a vertical direction as shown in FIG. 4B at its left portion. At this time, 12 lines of data blocks 33 are irranged m the vertical direction. Then, the ECC parity in code (PI (Parity in) code,1 31 having 10 bytes is added to the end of the respective one of the lata blocks 33 arranged in the vertical direction. ,-o as to construct one correction block 34 as -hown :n FIG 4B at its right portion At rhis stage the correction blocks 3 4 to eacn of which the ECC parity m code 31 is added are arranged in 12 lines. After that, this process is repeated for 16 data sectors 20. By those processes, the correction blocks 34 having 192 lines are obtained Xext. m such a condition that the correction blocks 34 m the 192 lines are arranged in the vertical direction, the correction blocks 34 m the 192 hnes are divided in the vertical direction from the beginning thereof for each one byre, and 16 ECC parity out codes (PO (Parity Out) codes) 32 are added to the respective one of the divided data. incidentally, the ECC parity out code 32 is added to the portion of the ECC parity in code 31 among the error correction block 34. By the above mentioned processes, one ECC block 30 including 16 data sectors 20 are formed as shown in FIG. 4B at its right portion. At this time, the total amount of the information included in one ECC block 30 is (172 + 19) bytes X (192 -f 16) lines = 37856 bytes. Among these, the actual data 24 is 2048 bvtes ■ 16 lines = 32768 bytes Further m the ECC block 30 shown in FIG 4B at its right portion, the one byte data is indicated by 'D = .**'. For example. "D1.0" indicates the one byte data which is disposed at the 1st line and the 0th column. "D190.170"' indicates the one byte data which is disposed at the 190" hne and the 170th column. Therefore, the ECC parity in code 31 is disposed at the 172nd column to the 181st column. The ECC parity out code 32 is disposed at the 192nd line to the 207lh line. Further one correction block 34 is recorded continuously on the DVD-RW Here, the reason why the ECC block 30 is constructed to include both of the ECC parity m code -51 and the ECC parity out code 32 as shown in FIG. 4B at its right portion is that the correction of the data arranged m the horizontal direction m FIG. 4B at its right portion is performed by use of the ECC parity m code 31. and the correction of the data arranged in the vertical direction in FIG. 4B at its right portion is performed by using the ECC parity out code 32. Xameiy. m the ECC block 30 shown in FIG. 4B at its right portion, it is possible to perform the error correction redundantly m the horizontal direction and the vertical direction, so that the error correction more powerful than the conventional error correction process used for the conventional CD or the like can be performed. More concretely as for this point, for example, even if all of one correction block 34 (which includes the data of 182 bytes in total including the ECC parity in codes 31 m one line amount and is recorded continuously on the DVD-RW as mentioned above) is destroyed by a scratch etc.. of the DVD-RW. it is the data destruction of merely one byte with respect to the ECC parity out code 32 in one column if it is seen from the vertical direction. Therefore even if one correction block 84 is completely destroyed. :t is possible to correctly reproduce the data by performing the error correction as long as the correction usms the ECC parity out code 32 of the respective one of the columns is performed. Next, how to record the data sector 20. which is constructed in the ECC block 30 as shown in FIG. 4B at its right portion, onto the DVD-RW is explained with reference to FIG. 5. in FIG. 5. the data indicated by "D = *" corresponds to the data described within FIG. 4B at its right portion. When recording the ECC block 30 onto the DVD-R. at first, the ECC blocks 30 are arranged in <>ne row in the horizontal airection for each correction block 34 to be thereby interleaved as shown m FIG. 5 at its top portion, so that the ECC block 30 is divided into the 16 recording sectors 40. At this time, one recording sector 40 includes the information of 2366 bytes (i.e., 37856 bytes — 16). The data sector 20 and the ECC parity in code 31 or the ECC parity out code 32 are mixed in this one recording sector 40. At the lead of each recording sector 40, the ID information 21 of the data sector 20 (referring to FIG. 4A) is disposed. Then, each recording sector 40 is divided into the data 41 for each 91 bytes, and a header H is added to each of them. After that, by 8-16 modulating the recording sector 40 in this status, one synchronization frame 42 is formed for each data 41. At this time, one synchromzation frame 42 is constructed by the header H and the data 43. The information amount within one synchronization frame 42 is 91 bytes X 8 X (16/8) = 1456 bytes. The information is written onto the DVD-RW m such a condition that the synchronization frames 42 are continued. At this time, one recording sector 40 includes 26 synchronization frames 42. By constructing: the above explained physical format and thereby recording- the information onto the DVD-RW if the 6" 16 demodulation and the de-interleave are performed upon reproducing the information from the DVD-RW (refer to FIG. 5). it is possible to recover the original ECC block 30. so that it is possible TO correctly reproduce the information while performing the powerful error correction. FIG. 6 to FIG. 8 are diagrams explaining the operation of the embodiment, and respectively showing the internal structure of the disc production apparatus, the flowchart of its operation and the procedures of the disc production method. in the present embodiment, a disc production apparatus shown in FIG. 6 is used in order to produce the optical disc As shown in FIG. 8. when producing the DVD-RW, a laser cutting operation by use of the disc production apparatus is performed at first (step Si). More concretely, a photo-resist 15 is formed on a glass substrate 14 and is exposed by a light beam so as to form a pattern of the photo-resist 15 corresponding to the groove track G. the land track L and the land pre-pit LPP as well as the emboss pit. Then, the exposed photo-resist 15 is developed, so that the pattern of the photo-resist 15 is formed on the glass substrate 14 (step S2). Then, a master stamper 47 (i.e.. a so-called stamper disc) is formed by using this pattern of the developed photo-resist 15 (step S3). Then, a sub-master stamper 48 is formed by applying the electrocasting process once with respect to the master stamper 47 (step S4). Alternatively, a stamper may be obtained by applying the electrocasting process even times with respect to this sub-master stamper 48. Then, an emboss process may be performed (step So), and the DVD-RW 1 having the groove 2 and the land 3 is finally produced by an replication process using the sub-master stamper 48 (step S6). By the above mentioned laser cutting process, since the cutting process of the original disc is performed just once, the pre-pit 4 is not drifted on the land 3, so that the DVD-RW 1 which is quite accurate can be produced. FIG. 6 shows a disc production apparatus using the above mentioned laser cutting operation. in FIG. 6. the disc production apparatus is provided with- a laser generating device 10 uf large output type for emitting a laser beam- a light modulator 11 for modulating the laser beam from the laser generating device 10- an objective lens 13 for collecting the modulated laser beam so as to form a light spot on the photo-resist 15 on the glass substrate 14- encoders 12A and 12B for encoding land cutting information' a controller 50 for controlling the encoders 12A and 12B as well as other constitutional elements, and a modulation circuit 21 for modulating a signal from the encoder 12A. The disc production apparatus is also provided with: a spindle motor 16 for rotating the glass substrate 14,' a transfer unit 19 for transferring the spindle motor 16,' a transfer servo circuit 51 for transfer-servo-controlling the transfer unit 19; and a position detector 52 for detecting a position of the transfer unit 19 and sending a position signal to the transfer servo circuit 51. The disc production apparatus is further provided with: a rotation servo circuit 18 for rotation-servo-controllmg the spindle motor 16; and a rotation detector 17 for detecting a rotation number of the spindle motor 16 and sending a rotation signal to the rotation servo circuit 18. in operation, the laser beam A is modulated by the light modulator 11 so as to form the groove, on the basis of the land cutting information sent from the encoder 12A. The laser beam B is modulated by the light modulator 11 so as to form the land pre-pit. The control procedures under the control of the controller 50 are shown in FIG. 7 and FIG. 10 respectively. The glass substrate 14 is set to the spindle motor 16. The spindle motor 16 is rotated at a constant linear velocity