MXPA98010734A

MXPA98010734A - Opt disc

Info

Publication number: MXPA98010734A
Application number: MXPA/A/1998/010734A
Authority: MX
Inventors: Kazuhiko Nakane; Yoshinari Takemura; Hiroyuki Ohata; Masato Nagasawa; Kenji Gotoh; Yoshinobu Ishida; Isao Satoh; Shunji Ohara; Takashi Ishida
Original assignee: Matsushita Electric Ind Co Ltd; Mitsubishi Electric Corp
Priority date: 1996-06-26
Filing date: 1998-12-15
Publication date: 2000-06-05

Abstract

The present invention relates to an optical disc using an individual spiral groove and track format and a directional signal that activates simple sector address management and format compatibility with read-only optical disc media. Four physical areas PID1-PID4 are recorded in a header area, so that PID1 and PID2 are compensated a step and a half of track towards the inner circumference of the disk from the center of the groove track, and the physical areas PID3 and PID4 are compensated a step and a half of track towards the inner circumference of the disk from the center of the groove track, and the header area is shared by sectors of the groove track and sectors of the ledge track. A sector of the flute track is written in PID3 and PID4, and the sector direction of the flute track sector adjacent to the outer circumference of that flute sector is written in PID1 and PID2. The direction of each sector increases (1) in the same sequence in which the spiral sectors of recording are formed.

Description

OPTICAL DISC Technical Field The present invention relates to a rewritable optical disk, formatted to record signals of both a grooved recording track by means of a guide groove and an ungrooved recording track formed between the guide groove. Background Art A method of recording of projection and groove, by which data is recorded in both the grooved part (the "groove") as in the normally spiral guide channel, as in the ungrooved media that lie between the spirals of the groove (the "projection") of the guide channel, has been proposed as the method of recording a disc Rewritable high-capacity optical as a means to improve recording density. This method has the effect of greatly improving the recording density since the track pitch of the recording tracks can therefore be halved on a disk with a given flute pitch. A conventional optical disc formatted for projection-groove recording is described in Japanese Unexamined Patent Document (kokai) S63-57859 (1988-57859) and shown in Figure 9 by way of example only. As shown in Figure 9, both the groove 94 and the projection 95 are formed through a guide channel cut on the surface of a disc substrate, and a recording layer 91 is then formed on the entire surface of the disc. Recording pits 92 are formed in the recording layer of both the groove 94 and the projection 95. The groove 94 and the projection 95 each form a continuous recording track on the disc. Recording and reproduction of data is achieved with this optical disc by scanning the flute recording track or the protruding recording track with the restricted and focused laser beam 92 of the optical disc drive device. It should be noted that with this conventional outgoing-groove recording track format the guide channel is formed in the disk as a single continuous spiral channel. The groove recording tracks 94 and projection 95 tracks are thus connected to each other, each forming a single continuous spiral recording track, respectively. Note that the disc format is referred to as "double spiral outgoing-fluted format" or DS-L / G format in order to distinguish this disc format from the "single spiral fluted outgoing format" or SS-L / G described above. continuation. The individual spiral outgoing-spline format is shown in Figure 14. In this format an individual spiral is separated into several flute recording tracks, each equivalent to a circumference of the disk and several outgoing recording tracks, each equivalent to a circumference of the disc, wherein the projection tracks are disposed between the groove tracks and the groove tracks and the projection tracks alternate, to be at the beginning at the end of an individual spiral formed in the disc. Disclosed is an optical disk formatted with a single spiral recording track with contiguous flute recording tracks and protrusion recording tracks as shown in Figure 14, for example, in Japanese Unexamined Patent Document (kokai) H4- 38633 (1992-38633) and in Japanese Unexamined Patent Document (kokai) H6-274896 (1994-274896). A particular advantage of this individual spiral outgoing-spline format is that it is particularly suitable for continuous recording and playback of data because the recording track is an individual contiguous track on the disc. This is particularly important, for example, in video applications because continuous recording and playback of data is essential for the reproduction of the moving image. With a conventional single-spline outgoing-grooved format as shown in Figure 9, however, the protruding track and the groove track are formed as discrete recording coils, as described above. To change and keep recording or reproducing from the outgoing track to the groove track, for example, it is, therefore, necessary to interrupt the recording or reproduction at least in a place on the surface of the disk, in order to have access to the grooved track from the outgoing track. The same is true when continuing to continue with the recording or playback from a flute track to a protruding track. Although it is possible to avoid this interruption in the recording or reproduction by, for example, a buffer, this produces a higher cost. Note that this higher cost is avoided with the individual spiral outgoing-groove format described above. As described in Japanese Unexamined Patent Document (kokai) H6-290465 (1992-290465) and in Japanese Unexamined Patent Document (kokai) H7-57302 (1995-57302), the transition point between the tracks The spline and alternating ledge tracks are detected on an SS format-Single spiral flute-protrusion format, and the track servo-polarity is modified at the detected transition point to track either the flute recording track or the flute track. Outgoing recording track. Next, the proposed method for forming the previously embossed pits of the original directional signal in order to form an optical disk using the conventional outgoing-groove format is described. There are three known methods for forming the pre-embossed pits in the conventional double-spiral projection-spline format as shown in Figures HA, 11B and 11C. With the independent projection / groove direction creation method shown in Figure HA, a single sector address is assigned to the sectors of the track of the projection and to the track sectors of the groove. If the width of the directional signal pits is equal to the width of the spline, the pits will be connected to the pits that form the direction signal of the sector of the adjacent track, and detection of the directional signal will not be possible. The width of the pit of the direction sign should therefore be less than the width of the groove, and is generally about half the width of the groove. However, if grooves and pits of different widths are to be formed, during the production of the master optical disc, it will be necessary to modify the diameter of the laser beam when cutting the previously engraved pits in relief and when cutting the grooves. Therefore, it is necessary to cut the master disc using two laser beams, one to cut the grooves and one to cut the pits.

This requires highly precise alignment of the restricted beam centers because a compensation between the two centers of the restricted beam causes a compensation in the tracking of the beam when reproducing the signaling address pits, and when recording and reproducing the user data. This degrades the quality of the reproduced data. More specifically, a tracing compensation increases the error rate, which leads to a lower reliability of the data signal. Therefore, it is necessary to accurately align the two laser beams, which leads to a higher cost during the production of the master disk. When considering these problems, a method is preferred to cut both grooves and pits using a single laser beam, such that the width of the pit of the direction signal is substantially equal to the width of the groove as shown in FIG. Figure 11B and Figure 11C, in terms of the precision and cost of disk production. The format shown in Figure 11C is that of the conventional optical disk described in Japanese Unexamined Patent Document (kokai) H6-176404 (1994-176404). This format uses a common outgoing / groove direction scheme. Pre-embossed pits of the directional signal are formed in approximately the center of a projection track and a pair of projection and groove tracks, such that both tracks may have the same individual direction signal pits. The format shown in Figure 15C is that of a conventional optical disk which is described in Japanese Unexamined Patent Document (kokai) H7-110944 (1995-110944). This format uses an outgoing and grooving direction scheme in which a separate direction is assigned to each outgoing and grooved track using previously embossed pits formed in a compensated manner in line parallel to the track, such that the pits of the direction signal of the adjacent tracks do not overlap. In addition to the considerations of the track format and the sector format of the outgoing and grooved recording methods described above, it is also necessary to take servo characteristics into consideration. An individual beam optical system with recordable optical discs is used as a mechanism to improve the efficiency of the use of light. In the tandem method, which is an example of such systems, sensor compensation occurs as the lens moves in the radial direction. Track compensation can lead to crosstalk and cross-erasure problems and, therefore, is a considerable problem in high-density recording. Therefore, it is necessary to apply compensation correction to eliminate any track compensation. Several methods of compensation correction have been studied. By applying the conventional methods of inserting directional signals for the outgoing and grooved recording, it has not been possible to achieve the characteristics required to achieve the correction of track compensation that are needed with optical disks with an individual spiral-spline format. With the common projection / groove direction method shown in Figure 15B, for example, the pits are formed on only one side and the track compensation tends to simply increase during the reproduction of the direction signal. Furthermore, not only this happens in the discrete protrusion and groove direction method shown in Figure 15C, but also the detection of tracking compensation is difficult. A typical conventional method for compensating track compensation that occurs in a tandem track servo method is described in Japanese Examined Patent Document (kokoku) H7-46303 (1995-46430) and known as the so-called "composite method". track swing ". This method continuously applies tandem track servo control to an optical disk wherein a header area comprising a pit sequence is laterally compensated with respect to a runway center disposed at a particular location., and the data recording area comprises a pre-formed groove of a particular depth, they are formed alternately along a predetermined track. Using the symmetry of the amplitude of the signal when reproducing the oscillation sequence of the pit in the header area, the track servo is controlled in such a way that the amplitude of the signal reproduced from the oscillation of the pit sequence laterally with respect to the center, it is the same on both sides of the center of the track, to compensate for the low frequency track compensation. This technique is more effective than those shown in Figures HA, 11B, 11C with respect to the insertion of the heading address signal. The technologies related to the format of the rewritable optical disc sector are described below. An example of the rewritable optical disk sector format is the ISO standard 130mm magneto-optical disk, with double-sided recording capacity of approximately two gigabytes (2 GB). This sector format is standardized in ISO-13842, "Information Technology - Extended Capacity Rewritable and Read-Only 130 mm Optical Disk Cartridges". Figure 12 shows, as an example, the format of a sector with a data area for the user of 512 bytes. In this example, each sector comprises a header area that includes the address information and the data recording area. The header area is formed on the projection of previously embossed pits that are narrower than the projection, and the data recording area is formed on the ground. Each recording sector is 799 bytes long, including a data area for the user of 512 bytes. The header area comprises, in sequence, from the beginning of it a SM sector mark that is used to detect the beginning of the sector and consists of a specular surface and a pit engraved in relief of a length that does not occur in the signal data modulation, an individual frequency pattern area VF01 for playback clock synchronization, AM address marking area for byte synchronization during header reproduction and PIDL of the address area for storing the information of the direction of the sector. This sequence sequence of the individual frequency pattern VF02 for the reproduction clock synchronization, the address marking area Am for the synchronization during the header reproduction, and the address area Pid2 for storing the sector address information is then repeated , and the previously formatted header then concludes with a final PA synchronizer area to complete the modulation. The lengths of these header areas are of the SM sector brand, 8 bytes; VF01, 26 bytes; address mark AM, 1 byte; Pidl, 5 bytes; VF02, 20 bytes; address mark, 1 byte; Pid2, 5 bytes; and final synchronizer PA, 1 byte. Note that the first VF01 of the two individual VFO frequency pattern areas of the header area is longer than the second VF02. The physical address of the Pid area comprises 3 bytes that contain the information of the sector address and the Pid number, and a 2-byte address error detection code. The sector address is calculated based on the address of the track written in bytes 1 and 2, and the sector address written in the six low bits of the byte 3. The data recording area comprises in sequence from the start of the same an ALPC laser power adjustment area with a Gap adjustment range before and after it, an individual frequency pattern area VF03 to synchronize the playback clock of the recorded data, a synchronization mark Sync for synchronization Byte during playback, a Data data area, and a Buffer buffer zone to absorb variations in disk rotation and clock frequency. Note that the Data data area contains the user data written in the sector, a CRC for the detection and correction of errors, and a resync resynchronization byte to recover from the loss of synchronization. The lengths of these areas in the data recording area are 10 bytes for the ALPC and Gap areas; 27 bytes for VF03; 4 bytes for Sync; 670 for the Data area; and a 21-byte buffer. Note that VF03 is longer than VF01 in the header. Note, in addition, that the modulation code (1.7) is used in this standard in cases where the coding parameters of the modulated signal expressed in the format (d, k; m, n) are (1,7; 2,3). In the modulation code (1,7) the shortest label length T is (d + l) T, which is equal to 2T, and the long mark T max is (k + l) T, which is equal to 8T. A 2T pattern, which is the pattern with the shortest period in modulation coding (1.7), is used for VF02, and VF03. The bits of the modulated channel are recorded using the ends of the recording marks in an NRZI format in such a way that the front and back ends express the data of each record mark of the disc. It should be noted at this point that this is the recording method used in the invention descd in the present specification.

It should be noted, moreover, that the outgoing and grooved recording method has not been achieved at present using either the individual spiral or double spiral recording track, nor has a physical format such as that of the sector format been achieved. of a conventional magneto-optical disc. It is also necessary to take into consideration the compatibility with the format used in read-only optical discs in digital video applications when inventing the sector format for a rewritable optical disc. For example, if a sector format is to be achieved that provides the greatest possible compatibility with read-only digital video discs (DVD) comprising 26 synchronous structured groups of 93 bytes each in a sector, that is, 2418 bytes / sector , it is necessary that each sector of the rewritable optical disk be formatted with the capacity to store 2418 bytes of user data in the data area with the length of the sector, including the header area, being an integer multiple of 93 bytes. With conventional methods of writing address signals on optical disc media using a protrusion and flute recording method, the same sector direction is recorded both in the boss sectors and in the flute sectors. This makes it difficult to manage sector addresses since a specific sector can not be specified using only the information obtained in the header areas of the disk. As with read-only optical disc media, rewritable optical disc media is also used for video applications. In order for a reproduction device to be capable of reproducing both types of optical disc media at the lowest possible cost, therefore, it is necessary that the format of the rewritable optical disc media be compatible with the format of the optical disc media. read only, so that as many of the common playback circuit components as possible can be exploited in the playback device. It is also necessary that a rewritable optical disk medium has a physical format by which the address information can be added, so that the read reliability of the address information is guaranteed while reserving a data recording area with the tolerance long required for a phase transformation medium. Presentation of the invention Taking into consideration the above problems, the aim of the present invention is to provide an optical disk having an individual spiral-outgoing format in which the address information is added so as to activate the simple operation of sector address. A further object of the invention is to provide an optical disk having a physical format by which compatibility with the read-only optical disk means can be easily achieved. Yet another additional object of the invention is to provide an optical disk having a physical format to improve the reliability of data rewriting operations and improve the reliability of the reading of address information. To achieve the above objects, an optical disk according to the present invention is an optical disk in which the data recording area comprises both grooves formed circumferentially in a substrate of the disk and the projections between the grooves, a recording film of Phase transformation is formed in the data recording area to record information using the leading and trailing ends of the recording marks produced by a localized change in the reflectivity effected in the phase change recording film, by emitting to it a laser beam of a particular wavelength? focused by a lens with a particular aperture NA, and a single recording spiral is formed by alternatingly connecting the groove recording tracks equivalent to a circumference of the disc and the outgoing recording tracks equivalent to a circumference of the disc with a pitch of track p where p <; (? / Na) < 2 P. The recording tracks comprise a whole number of recording sectors where the length of the recording sector is sufficient to store the written data in a recording area of a read-only optical disc, and each recording sector comprises a specular area that it is simply a mirror surface area, and a pre-formatted header area with pre-embossed pits that are detectable from a radial difference signal and represent information such as address information, wherein at least the information of the address recorded in the header area is modulated by means of a modulation method limited by the length of the route. The header area comprises a PID physical address area recorded four times. Each PID contains a single VFO frequency pattern area for generation of the synchronization clock and synchronization detection during playback, an AM address mark for byte synchronization during header playback and for initiating detection synchronization, a PID address area for maintaining the sector address information, an IED address error detection area for storing the address error detection code, and a final PA synchronizer for completing the modulation. When the four physical address areas PID, PID1, PID2, PID3 and PID4 are labeled from the first PID of the header area, PID1 and PID2 are offset approximately p / 2 towards the outer circumference or the inner circumference from the center of the groove recording track, and the PID3 and PID 4 are compensated approximately p / 2 towards the inner circumference or the outer circumference of the center of the track of a grooved recording track, the direction of the adjacent recording sector next to the outer circumference of a groove recording sector recorded in the PID address area of PID1 and PID2, and the direction of the groove recording sector recorded in the PID address area of PID3 and PID4, are each numbered to increase 1 in the sector sequence of the recording spiral. The recording marks in each VFO are greater than the shortest recording mark in the modulation method. In addition, the length of the VFO in PID1 and PID3 is sufficient to contain the ends of enough recording marks to block the timing of the playback clock within the VFO, and the length of the VFO in PID2 and PID4 is enough to hold the ends of enough recording marks to reinforce the clock synchronization playback within the VFO. The VFO areas in PID1 and PID3 are sufficiently longer than the VFO areas of PID2 and PID4. The address mark AM is longer than the largest recording mark of the modulation method and long enough to contain several channel bit patterns of a record mark length that does not appear in the modulation bit sequence. The Pid is at least long enough to discriminate several recording sectors capable of storing user data that exceed the recording capacity of the previous read-only optical disc medium. The IED is of a length that activates the detection of PID reproduction errors of the address area with an error detection rate less than or equal to a particular rate. The final PA synchronizer has at least the length required by the modulation method and has a length that activates the termination of the recording marks, and the specular area is longer than the largest recording mark of the modulation method. An optical disk according to claim 2 is an optical disk in which the data recording area comprises both grooves formed circumferentially in a disk substrate and the projections between the grooves., a phase transformation recording film is formed in the data recording area to record information using the leading and trailing ends of the recording marks produced by a localized change in the reflectivity effected in the phase change recording film. , when emitting to it a laser beam of a particular wavelength? focused by a lens with a particular aperture NA, and a single recording spiral is formed by alternatingly connecting the groove recording tracks equivalent to a circumference of the disc and the outgoing recording tracks equivalent to a circumference of the disc with a pitch of track p where p <; (? / Na) < 2 P. The recording tracks comprise a whole number of recording sectors where the length of the recording sector is sufficient to store the written data in a recording area of a read-only optical disc, and each recording sector comprises a specular area that it is simply a mirror surface area, and a pre-formatted header area with pre-embossed pits that are detectable from a radial difference signal and represent information such as address information, wherein at least the information of the address recorded in the header area is modulated by means of a modulation method limited by the length of the route.

The header area comprises a PID physical address area recorded four times. Each PID contains a single VFO frequency pattern area for generation of the synchronization clock and synchronization detection during playback, an AM address mark for byte synchronization during header playback and for initiating detection synchronization, a PID address area for maintaining the sector address information, an IED address error detection area for storing the address error detection code, and a final PA synchronizer for completing the modulation. When the four physical address areas PID, PID1, PID2, PID3 and PID4 are labeled from the first PID of the header area, PID1 and PID2 are offset approximately p / 2 towards the outer circumference or the inner circumference from the center of the groove recording track, and PID3 and PID 4 are compensated approximately p / 2 towards the inner circumference or the outer circumference of the center of the track of a groove recording track, the direction of the groove recording sector recorded in the PID address area of PID1 and PID 2, and the direction of the outgoing recording sector, adjacent to the outer circumference side of the engraved recording sector in the PID address area of PID3 and PID4, are each numbered for increase the sequence of the sector of the recording spiral by 1. The recording marks in each VFO are greater than the shortest recording mark in the modulation method. In addition, the length of the VFO in PID1 and PID3 is sufficient to contain the ends of enough recording marks to block the timing of the playback clock within the VFO, and the length of the VFO in PID2 and PID4 is enough to hold the ends of enough recording marks to reinforce the clock synchronization playback within the VFO. The VFO areas in PID1 and PID3 are sufficiently longer than the VFO areas of PID2 and PID4. The address mark AM is longer than the largest recording mark of the modulation method and long enough to contain several channel bit patterns of a record mark length that does not appear in the modulation bit sequence. The Pid is at least long enough to discriminate several recording sectors capable of storing user data that exceed the recording capacity of the previous read-only optical disc medium. The IED is of a length that activates the detection of PID reproduction errors of the address area with an error detection rate less than or equal to a particular rate. The final PA synchronizer has at least the length required by the modulation method and has a length that activates the termination of the recording marks, and the specular area is longer than the largest recording mark of the modulation method. The optical disk according to claim 3 further defines the optical disk of claim 1, such that the track pitch p of 0.74 m when the wavelength of the laser beam? is 650 nm and the NA lens aperture is 0.6, the modulation method will be a method to modulate at a speed of 8 bits of data to 16 bits of channel, the shortest recording mark having 3 bits of channel and having the longest recording mark 11 channel bits, and defines the VFO in 36 bytes in PID1 and in PID3, and 8 bytes in PID2 and in PID4, the address mark AM 3 bytes, Pid 4 bytes, the IED 2 bytes, the final synchronizer PA 1 byte, and the specular area 2 bytes. The optical disk according to claim 4 further defines the optical disk of claim 2, such that the pitch of p of 0.74μm when the wavelength of the laser beam? is 650 nm and the NA lens aperture is 0.6, the method of modulation will be a method for modulating at a speed of 8 bits of data to 16 bits of channel, the shortest recording mark having 3 channel bits and having the longest recording mark 11 channel bits, and defining the VFO in 36 bytes in PID1 and in PID3, and 8 bytes in PID2 and in PID4, the address mark AM 3 bytes, the Pid 4 bytes, the IED 2 bytes, the final synchronizer PA 1 byte, and the specular area 2 bytes. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more fully understood from the detailed description provided below and the accompanying diagrams in which: Figure 1 is a sector format diagram of an optical disk according to the first embodiment of the invention. Figure 2 is a map of the sector arrangement on an optical disk according to the first embodiment of the invention. Figure 3 is a map of the layout of the header area on an optical disk according to the first embodiment of the invention. Figure 4 is used to describe the scanning point scan of the header area of an optical disk according to the first embodiment of the invention. Figure 5 is a map of the layout of the header area on an optical disk according to the first embodiment of the invention.

Figure 6 is a map of the layout of the header area in the transition area between the projection tracks and the groove tracks in an optical disk according to the first embodiment of the invention. Figure 7 is a map of an alternative header area arrangement on an optical disk according to the first embodiment of the invention. Figure 8 is a map of an alternative arrangement of header area in the transition area between projection tracks and groove tracks in an optical disk according to the first embodiment of the invention. Figure 9 is a schematic diagram used to describe the structure of an optical disc using a protrusion and flute recording format in accordance with the related technology. Figure 10 is a diagram used to describe the individual spiral protrusion-spline recording format of an optical disc in accordance with the related technology. Figures HA, 11B, 11C are diagrams used to describe various header area formats in the outgoing and groove recording in accordance with the related technology. Figure 12 is a diagram used to describe the sector format of a magneto-optical disc of the ISO standard of 130 mm. BEST WAY TO BRING THE INVENTION TO PRACTICE The preferred embodiments of the present invention are described below with reference to the appended figures. Embodiment 1 High capacity rewritable optical disc media in accordance with preferred embodiments of the present invention satisfy the following conditions: 1. a specific general recording capacity, 2. compatibility with read-only optical disc media , 3. a recording density by which the practical reliability of the data can be guaranteed. Therefore, since there is a choice between the total disk capacity and the linear recording density, the zone divisions, sector structure, sector length and byte size of each area of the sector are previously determined to balance this selection with the above conditions.

The limits on the size of the sector are described below, insofar as they refer to compatibility with the sector format of read-only optical disc media, noting, first, that the read-only optical disc media considered in The present document is a read-only Digital Versatile Disk (DVD) medium (DVD-ROM below). The data capacity of a recording sector on a DVD-ROM is 2048 bytes. Each sector also includes control information, for example, an error correction code, synchronization signals and a sector address signal, in addition to the data. The length of the synchronous frame of this sector format is 93 bytes, and each recording sector contains 26 contiguous synchronous frames of 93 bytes each. A synchronization flag is inserted at intervals of 93 bytes, that is, the length of the synchronous frame, and the size of the sector is, therefore, 93 x 26 = 2418 bytes. In a rewritable optical disk according to the present invention, the synchronous frame length used, for example, for disk speed control is equal to the length of the synchronous frame of a DVD-ROM. This allows the rewriteable optical disc to be easily reproduced using a DVD-ROM drive apparatus, and is a condition of extreme importance to ensure compatibility with DVD-ROM media during playback. Since the length of the synchronous DVD-ROM frame is 93 bytes, the length of the recording sector of an optical disk according to the present invention is (93 x n) bytes. The data correction code of a DVD-ROM is recorded in batches of 2418-bytes in the recording sector. further, for the address management required for the rewritable area, the recording sector also comprises an additional header area where the address information is written. This means that the integer n by which the sector length is calculated, including that new heading area, is a value of 27 or greater because (93 xn) must be greater than 2418. However, if n is unnecessarily large , the proportion of redundancy increases with respect to the data capacity. The data recording density is determined by the track pitch and the linear recording density, as well as the redundancy of the format of the sector. The track pitch is 0.74 m and the linear recording density is limited to a bit length of 0.4 μm or greater. Although described in more detail below, note that the track pitch is determined by the limitations relating to the requirements for scanning the stability of servo signal and crosstalk performance, specifically the ability to suppress crosstalk from an adjacent track. , so that the data error rate remains below a particular level. The linear recording density is determined, likewise, based on the ability to suppress the jitter in the reproduced signal from the recorded signal, so that the reproduction error rate is suppressed below one level particular. Given these limitations, the optimal value of n is 29, if a total recording capacity per disk of 2.6 GB per side is to be achieved on a 120 mm diameter disk. The length of the recording sector is, therefore, 2697 bytes. If the length of the recording sector is 2697 bytes there is no extra capacity for the allocation of bytes to the various areas arranged in the sector. The following describes the conditions that must be met in each of the sub-areas of the sector and the allocation that satisfies these conditions and the general limits of the disk. If extra capacity is available in bytes, it is easy to assign sufficient length to the header area, which is redundant, and, therefore, ensure great reliability in the reproduction of address information. For the reasons described above, however, it is extremely difficult to manipulate the positioning of the address signal to eliminate redundancy while guaranteeing the reliability of an optical disk according to the preferred embodiment of the invention. The arrangement of the sector of an optical disk according to the present invention is described below with reference to the appended figures. It should be noted that a sector is the unit of data that the disc drive apparatus can read at a time. It should further be noted that the data recording area of an optical disk according to the present invention comprises both grooves formed circumferentially to the substrate of the disk and protrusions between the grooves. This data recording area is coated with a phase transformation recording film in which a localized change is made in the reflectivity to write and erase data, and emit thereto a laser beam of a particular wavelength? focused by a lens with a particular aperture NA. The data is recorded by means of the leading and trailing ends of the recording marks produced by this local change in reflectivity. An aligned sector format is also used.

In this format, the header area of each sector is aligned with the header areas of the adjacent tracks in the same radial position. The optical disk of the invention also utilizes a single-spiral protrusion-spline format (SS-L / G format) as described above, that is, a format in which an individual spiral is separated into several flute recording tracks. , each equivalent to a circumference of the disk and several protruding recording tracks, equivalent to a circumference of the disk where the protrusion tracks are disposed between the flute tracks, the flute tracks and the flute tracks alternate in principle finally in an individual spiral formed on the disk, and each recording track comprises a whole number of the recording sectors. The entire surface of the disk is also divided into several zones with a zone format in which the number of recording sectors per track increases from the inner circumference side to the outer side thereof of each zone, and the density of Linear recording of the sectors of each zone is substantially the same. The sector format of an optical disc medium in accordance with an embodiment of the invention is shown in Figure 1 and is described below. As shown in Figure 1, each sector comprises a previously formatted pit area, formatted with pits engraved on the surface, such that the address information, for example, can be detected from a difference signal in the direction radial, and a data recording area to record other information. The first part of the header area, that is, the part corresponding to the previous PID1 and PID2, is compensated approximately in p / 2 (where p is the track pitch) towards the outer circumference of the disk from the center of the track, and the last part of the header area, that is, the part corresponding to the PID3 and the previous PID4, is compensated approximately in p / 2 towards the inner circumference of the disc from the center of the track, such In this manner, an oscillation signal is generated and generated as the laser beam sweeps the header area. The arrangement of the sector of an optical disk medium according to the first embodiment of the invention is shown in Figure 2. As shown in the Figure each sector of 2697 bytes comprises a previously formatted pit area of 130 bytes that it comprises a header area of 128 bytes, and a 2-byte mirror area, which simply comprises a mirror surface, and a data recording area of 2567 bytes to store 2048 bytes of user data. The data recording area more specifically comprises a space area of 10 bytes, a guard data area, individual frequency pattern area VF03 of 35 bytes, previously synchronized area of 3 bytes, data area of 2418 bytes, a 1 byte final synchronizer, a guard data area of 45 bytes, and a buffer area of 40 bytes. Variations in the length of the sector caused by writing errors of the clock or disk speed are compensated using the buffer zone at the end of each sector. To increase the data capacity of the optical disc user, it is necessary to shorten the redundancy header area as much as possible, while still ensuring the reliability of the address reproduction. In addition, to maintain format compatibility with read-only optical disks, (93 x 3 =) 279 bytes of total sector length of 2697 bytes must be assigned to the required areas to activate data rewriting, including the header area, space, guard data, VF03 and buffer. The method of modulation used to record data on an optical disk is the so-called modulation method (8,16) in which the coding parameters (d, k,; m, n) are (2,10; 8,16). This is a limited run length coding (RLL) method in which the Tmin of the shorter brand length is 3T and the Tmax of the longest brand length is 11T. The layout of the header area of an optical disk according to the first embodiment of the invention is shown in Figure 3. Note that the header area comprises PID1, PID2, PID3 and PID4 where PID1 comprises a VFO ( Variable Frequency Oscillator) 1, AM address mark, Physical Identification (Pid) 1, Identification Error Detection code (IED) 1, a final PA synchronizer. The PID2 comprises similarly VF02, AM, Pid2, IED2 and PA. PID3 repeats VFOl and comprises AM, Pid3, IED3 and PA. Similarly, PID 4 repeats VF02 and comprises AM, Pid3, IED4 and PA. The PID1 and the PID2 are disposed at the boundary between the groove track and the boss track on the outer circumference side of the groove track, and the PID3 and the PID4 are disposed at the boundary between the groove track and the groove track. the projection track on the side of the inner circumference of the groove track. More specifically, the PID1 and the PID2 are arranged in a compensated manner approximately at p / 2 (where p is the pitch of the track) towards the outer circumference of the disk from the center of the track of the flute recording sector, and the PID3 and PID4 are offset by approximately p / 2 towards the inner circumference of the disk from the center of the track of the flute recording sector. It should be noted that the numbers appearing after each area code shown in Figure 2 and Figure 3 indicate the size in bytes of the corresponding area. The area of the individual VFO frequency pattern for generation of the synchronization clock and synchronization detection during playback is described below. Note that the header area contains two VFOl and two VF02 blocks, while a third VF03 block is used in the data recording area. These VFO blocks are used to extract the phase latch loop (PLL) used to generate the read channel bit clock, which is used for signal reproduction. While VFOl and VF02 are formed from previously embossed pits, VF03 is written during data recording. As shown in Figure 3 the VFOl has 36 bytes and the VF02 has 8 bytes. The pair of PID1 and PID2 and the pair of PID3 and PID4 are compensated from the center of the track in the radial direction, as described above. The following describes why the VFOl in PID1 and in PID3 is longer than VF02 in PID2 and in PID4. Note that the trajectory of the scanning point in sweeping the groove tracks follows a path through the track header area as shown in Figure 4, where the path (a) is the swept path when the point is aligned to the center of the track and the VFOl is filled correctly in PID1-PID4. However, when the scanning point follows the compensated trajectory (b) next to the outer circumference of the center of the track, the scanning point is compensated in the PID3 and in the PID4 and the signal component coming from it is weak. In a hypothetical worst-case scenario, the data can not be read in PID3 and PID4. In this case, therefore, the PLL is obtained from the VFOl at the start of PID1. When the scanning point follows the path (c) compensated next to the inner circumference of the center of the track, the scanning point is compensated in the PID1 and in the PID2 and the signal component coming from it is weak. In a hypothetical worst-case scenario, the data can not be read in PID1 and PID2. In this case, therefore, the PLL is obtained from the VFOl at the beginning of the PID3. Therefore, it is evident that the VFOl in PID1 and PID3 is the point at which the PLL is engaged, and must, therefore, be longer than VF02 in PID2 and PID4, to improve reliability in signal reproduction. The error in the placement of the PID in the groove tracks and in the outgoing tracks is also taken into consideration. Bit synchronization is normal in the flute track PID because the four PID read in the flute tracks are cut in a single continuous operation. The PID pits read from a ledge track, however, are cut off when cutting the adjacent groove tracks on both sides of the ledge track and, therefore, invade the ledge track. Due to the fact that two tracks are actually formed in a single cutting operation, rotary deviations appear in the turntable operation in the PID and, therefore, it is normal to expect that bit synchronization will not be achieved. It is therefore necessary, when reading the PID of the outgoing track to restore bit synchronization and byte synchronization using the VFO and the AM address mark at the start of PID3 and PID4. The length of the VFO is the minimum length required to ensure error-free reproduction of the header area, which oscillates on both sides of the center of the track, as described above, when tracking a groove track and making tracking a salient track, even if the tracking deviates somewhat from the center of the track. The VFO used in an optical disk medium according to the present invention is a pattern, for example, ... 1000100010001 .... Note that this VFO pattern is different from the VFO pattern used in, for example, a disk standard optical ISO-13842 (international standard for 130 mm optical discs, which uses a modulation method (1,7)), that is, the maximum recordable frequency pattern, ... 101010 ... of the modulation method ( 1,7). If this practice of using the maximum recordable frequency pattern were followed, the VFO pattern of an optical disk according to the present invention would be ... 1001001001 ... because the modulation method (8,16) is used. There are disadvantages in the use of a high frequency pattern, however, even a low reproduction signal amplitude, greater difficulty in locating the start of the sector and greater fluctuation in phase. A conventional ISO standard optical disk places a SM sector mark before the VFO to facilitate the finding of the sector start, which then makes it easier to establish a PLL even with the VFO maximum frequency pattern. Each sector is started with the VFO on an optical disk medium in accordance with the present invention, however, and it is, therefore, more difficult to locate the beginning of the sector. On the other hand, if the frequency of the VFO is too low, that is, if the interval between "1" bits is too large, it becomes difficult to generate the channel bit clock from the PLL within an area of a length of limited bytes. To minimize these two problems, in the present invention a pattern is used, for example, ... 1000100010001 ..., as described above. Note that the same pattern is used in VFOl, VF02 and VF03. If the length of the VFOl is k bytes, and a modulation method (8,16) is used in which 8 data bits are converted into 16 channel bits, then the length of the VFOl is kx 8 x 2 = 16k bits of channel, where the channel bits are the bits after modulation of the signal. Since a VFO pattern is used ... 100010001 ..., changes occur between spaces and markings at 16k / 4 = 4 k places. On an ISO-13842 disk, however, the size of the VFO is 26 bytes, and there is, therefore, 26 x 8 x 3/2/2 = 156 changes between spaces and marks. Therefore, given the number of spacing changes, 4k, in the VFO of the invention it should be approximately equal to the number of VFO changes that a normal disk ISO-13482, 4 k = 156 or k equals approximately 39 bytes. The length of the VFO is defined, therefore, as the shortest required length, or 36 bytes, also taking into consideration the PLL and the cut-off level settling time. An Am address mark for byte synchronization during playback of the header area and detection of the initial synchronization clock are located on each PID between the VFO and the PID. This is for the synchronization of the hook byte after the bit synchronization in the previous VFO is completed. To prevent the reproduction apparatus from mistakenly capturing the address mark Am as data from the user's data area, the address mark AM is no longer the maximum possible record mark with the modulation method and is written using a pattern that it has an appearance of compliance with the modulation rules, that is, the address mark Am is a channel bit pattern of a recording mark length that does not appear in the modulated bitstream 0010010000000000000100010001000000000000010001 which contains two 14T sequences, which they are greater than the longmark greater Tmax = 11T of the bit sequence of the modulation method which is used in the present embodiment as a pattern that is not used anywhere else. Note that the previous 3-byte pattern is used to ensure the uniqueness of the pattern and activate the synchronization points so that they can be captured reliably, even with a slight amount of signal error. It is also possible to easily and reliably recognize the home address mark AM when reading the header area because a channel bit pattern of a record mark length does not occur in the modulated bit stream used for the address mark AM. The PID area of physical identification that follows the AM address mark stores the sector address, that is, a unique physical address. The Pid is 4 bytes long. The first byte contains information related to that sector and Pid, and the remaining 3 bytes express a unique address number to that sector. The address information is preferably a whole byte length, given the ease of handling of the sector and the design of the control firmware. More specifically, if a PID of 2-byte physical identification is used, it is possible to handle 216 = 65,536 sectors. Since the user data capacity of a sector is 2048 bytes of user data, this makes it possible to handle 2048 x 65,346 = 134,217,728 bytes or approximately 134 megabytes. This, however, is not enough. When using a PID of physical identification of 3 bytes, however, it is possible to handle 224 = 16,777,216 sectors, which means that 2048 x 16,777,216 = 34,359,738,368 bytes or approximately 34.36 gigabytes of user data can be handled. The recording capacity of an optical disc medium according to the present invention is approximately 2.6 GB, and the recording capacity of the digital read-only optical disc (DVD-ROM) with which the compatibility of the format is approximately 4.7 GB. Note that the approximately 34-GB recording capacity that can be handled with a 3-byte PID is approximately 13 and 7 times, respectively, these capacity figures. By being able to handle such massive recording capacity, it will be possible to guarantee future compatibility without changing the format of the sector even when the rules are modified in the future modulation of (8,16), which requires a final synchronizer of 1 byte after of the IED to complete the modulation. The end of the IED can also be a brand or a space. This means that if the fine synchronizer is bypassed and the VFO follows directly after the IED, the VFO pattern will not be determined uniformly due to the space or mark at the end of the IED. Therefore, several PA end synchronizer patterns are reserved in accordance with the modulation rules. A final 1-byte PA synchronizer is sufficient to complete both the modulation and the record mark. There is a 2-byte specular area arranged at the end of the header area. This specular area is a simple mirror surface in which no grooves or marks are formed. The specular area can be used to correct the signal from the servo sensor by comparing the reflected light in a groove area, and must have a minimum length of 2 bytes, due to considerations of response speed of electrical circuits. The space area marks the beginning of the data recording area after the hed, and has 10 bytes. This area of space provides a time buffer during which the optical disc drive apparatus calibrates the power of the laser for recording or reproduction, which process must be achieved between reading the header area and beginning the reading operation / writing VF03. A space length of approximately 10 bytes is required to guarantee a buffer time of approximately 6 μsec. The guard data is placed immediately before the VF03 area of the data recording area and immediately after the final PA synchronizer after the data field. The goal of the guard data area is to prevent data corruption due to the deterioration of the media. More specifically, the phase transformation means tend to deteriorate from where the overwrite recording is started and ended after repeated recording / erasing operations. The objective of this guard data area is to absorb the effects of any media deterioration, in such a way that the deterioration of the media does not cause the loss of data stored in the sector. The required length of the guard data area has been clearly determined from the experimental evaluation of the repeated recording pattern of the phase transformation medium. The minimum length required in bytes is defined in this case as approximately 15 bytes before the data and approximately 45 bytes after the data. It should be noted at this point that the length of guard data after the data area also reflects the initial position change described below. Another characteristic of the means of phase transformation is that when the same data is repeatedly recorded and deleted from the same place, the deterioration of the media advances and the repeated recording life tends to shorten. To prevent this by not repeatedly recording the same data pattern in the same area of the disk, a technique known as "initial position change" is used to randomly move the recording position of the data area each time an area is created. data. Thus a particular recording life can be obtained by changing the length of the guard data area to obtain the necessary change, increasing the area before the data and decreasing the area after the data. The total length of the previous and subsequent guard data areas remains constant. The size of the data area is determined by the ability to register 2048 bytes of user data. Sixteen additional data bits comprising a 4-byte data identification, 2-byte data identification error (IED) detection code, 6-byte reserve block (RSV), and an error detection code ( EDC) of 4 bytes are added to each block of 2048 bytes of user data. These supplementary data and user data are coded to generate a data unit A, which is therefore 2064 bytes long. Sixteen data units A are grouped in a data block of (2064 x 16 =) 33,024 bytes, which is arranged in a matrix of 192 rows by 172 columns. 10 columns of the error correction code (ECC) are then added, which results in a ECC block of 208 rows per 182 columns containing (208 x 182 =) 37,856 bytes. This 37,856-byte ECC block is sliced into 91-byte segments and a 2-byte synchronization flag is inserted at the beginning of each 912 byte, thus increasing the ECC block to 38,688 bytes. This total is then sliced into sixteen segments B of data unit 2418 bytes of 13 rows x 186 bytes. As a result of this process, the sixteen user data blocks of 2048 bytes are converted into blocks of 2418 bytes containing the ECC and other information. Although not described above, data modulation is also achieved during this process. If the data recording capacity of each sector is 2418 bytes, it is possible, therefore, to guarantee a user data recording capacity of 2048 bytes / sector. The size of the data area is, therefore, 2418 bytes. As in the header area, a 1-byte PA synchronizer follows the data area to complete the modulation and recording mark formation. The guard data, as described above, follow immediately after the final PA synchronizer, and are followed by a buffer zone. It should be noted that a certain amount of fluctuation in the rotational speed of the spindle motor used in the device can not be avoided, which rotationally drives the optical disk, and some amount of eccentricity resulting from mounting the optical disk in the Spindle motor, since this can cause the temporal duration of the sector to vary. Therefore, a buffer zone is inserted to provide the necessary margin to absorb these changes in the length of the time-based sector. When the drive unit registers the optical disk, the modulated data is recorded on the optical disk at the clock frequency of the channel of the driving apparatus. In general, the tolerance to the speed variations of the motor of use is at 1% of the target speed, and the tolerance to variations in the linear speed resulting from the eccentric rotation of the optical disk is 0.5% of the speed of the Use motor when linear speed becomes spindle motor speed. The buffer zone should, therefore, be approximately 1.5% of sector length (2697 bytes), or approximately 40 bytes, and therefore, in this embodiment, 40 bytes are allocated to the buffer area . Note that writing data in the buffer area during recording is prohibited. The data is also not read in the buffer zone during playback. A total physical sector size of (93 x n) bytes is preferred where n is an integer because synchronization marks are inserted at 93-byte intervals. The minimum value of n must therefore be 27 or greater because (93 n) must be greater than 2418. However, since the proportion of redundancy with respect to the data recording capacity increases if n is too large, n is defined as 29. The size of the sector is thus 93 x 29 = 2697 bytes. By using this sector size it is possible to achieve format compatibility with DVD-ROM discs in which the length of the synchronous frame is 93 bytes. This is because while the sector of the DVD-ROM disc comprises 26 synchronous frames of 93 bytes each, or a total of 2418 bytes, the data capacity of the user of the data area on an optical disk according to the present invention is 2418 bytes, and the length of the sector, including the header area is an integer multiple of 93 bytes. Since the synchronization marks are also inserted every 93 bytes, an apparatus capable of reproducing a DVD-ROM disc can easily detect the 93-byte synchronous frames in the format of the sector of the invention using common reproduction circuits. The parameters relating to the tracking of projections and grooves and the reading of the previously formatted PID signal, specifically, groove width, pit width and diameter of the beam explorer, are described below. It is well known that the diameter of the focused point is approximately? / NA where? is the wavelength of the laser used for the reproduction and recording of the optical disc and NA is the aperture of the objective lens that focuses the laser on the disc, although the diameter of the scanning point is also related to the distribution of the identity of the laser beam incident on the objective lens. So, for example, yes? = 650 nm and NA = 0.6, the diameter of the scanner point? / NA = 1.08 μm. If the track pitch of an optical disc medium according to the present invention is p, the distance between the centers of the grooves is 2p, and the width of the groove and that of the projection are both approximately p. Track pitch p is set as small as possible to improve recording density. Tests have shown that if the diameter of the scout point? / NA is 1.08 μm where? and NA are defined as above, the track pitch p must be 0.7 μm or greater to avoid crosstalk of the adjacent tracks. Although the optimum depth of the groove is also affected by the overlap of the scanning point in the adjacent track, substantially all crosstalk in the data recorded on adjacent tracks in a phase transformation means can be avoided if the depth of the groove is of about? / 6. To determine the maximum track pitch, consider what happens when the track pitch increases in relation to the diameter of the scanner point? / NA. In the outgoing and grooved recording schemes the track pitch is substantially equal to the groove width and the protrusion width. If the protrusion width and flute width become larger than the diameter of the focused scan point, the diffraction in the radial direction caused by the flute will not be substantially detected when the beam of light strikes the center of the runway. This is equivalent to the surface of the disk in the area of the diameter of the scanning point being a specular surface, and is not suitable for similar tandem and track detection methods, which are widely used for individual beam tracking systems in Rewritable optical disk drive devices, because a track error signal can not be generated. For these reasons, the relationship between the pitch p and the approximate diameter of the explorer point? / NA must be p <; (? / NA) z 2 p. In the present invention, therefore, the pitch of track p is set to p = 0.74 μm for a scan point diameter? / NA of 1.08 μm. In this case the width of the groove and the width of the pit are also equal to the pitch of track in substantially 0.74 μm, and the distance between the centers of the grooves is 1.48 μm, thus satisfying the condition that p < (? / NA) z 2. It is also necessary to determine the depth of the groove so that the tandem method for the track follower can be used. If the depth of the groove is adjusted by approximately? / 6, the track error signal required for the track follower can be detected. The same linear recording density is also used in the header area and the data area. Tests have also shown that the length of the data bit of 0.4 μm is the smallest practical bit length that produces acceptable signal characteristics with the modulation of (8,16) of branded end recording. In this case, the shortest possible record mark length is 0.6 μm. The method of assigning address values to the PID in the header area is described below with reference to Figure 5 showing the arrangement of the PID areas and the address values in the recording sectors of a disk medium. optical in accordance with the present invention. The groove directions are written in PID3 and PID4 in the heading area immediately preceding the data recording area of the groove track where PID3 and PID4 are offset% groove to the inner circumference from the center of the groove. The outgoing addresses are written in PID1 and PID2 in the header area immediately preceding the data recording area of the groove track on the inner circumference side of that outgoing recording track, where PID1 and PID2 are compensated% width of groove towards the outer circumference from the center of the groove. As a result, the outgoing addresses are written in PID1 and PID2 of the header area, immediately before the outgoing data recording area where PID1 and PID2 are offset% wide in groove to the inner circumference side of the center of the outgoing. The method of assigning addresses to the transition points between the projection and flute tracks, wherein the transition points are all aligned in a single position in the radial direction of the disc surface, is described below with reference to the Figure 6. Figure 6 shows the arrangement of the PID areas and the direction values of the recording sectors in the transition between projections and grooves in an optical disk medium according to the first embodiment of the invention. Note that in a single spline-spline format disc, the transition between the flute recording tracks and the protrusion recording tracks is aligned on a single radial line on the surface of the disc. As well as the heading areas not located in this transition area, the header areas that are in the outgoing-groove transition area are formatted in such a way that the groove directions are written in PID3 and PID4 in the area of heading immediately preceding the data recording area of the groove track, wherein PID3 and PID4 are offset groove width towards the inner circumference from the center of the groove. The outgoing addresses are written in PID1 and PID2 in the header area immediately preceding the data recording area of the groove track on the inner circumference side of that outgoing recording track, where PID1 and PID2 are compensated% width of groove towards the outer circumference from the center of the groove. As a result, the outgoing addresses are written in PID1 and PID2 of the heading area immediately preceding the data recording area where PID1 and PID2 are compensated% width of groove towards the inner circumference of that center of the outgoing. This arrangement is determined taking into consideration the compensation of the track that occurs during the cutting of the master disk. Both the flute header areas and the flute header areas are offset by flute width from the flute and flute runway centers. Cutting the direction signals for the adjacent projections and grooves simultaneously with the cutting of the groove recording tracks can reduce the track compensation that occurs between the center of the groove and the centerline between PID1, PID2 and PID3, PID4 in the header area. However, to the extent that the PID array shown in Figure 5 and Figure 6 can be achieved, the invention will not be limited to the previous master disc cutting method. When the header area is formatted like this, it is theoretically possible to detect the address signal using two types of signals. One of these is the detection of additive signal, a method used when playing formatted media with phase bits in the center of the track, such as a Compact Disc (CD). In this method the reflection of the disk light decreases due to the diffraction of the phase bit. The sum of the reflected light is obtained, therefore, for the detection of signals. The other method is the difference signal detection, which is based on the same principle applied for the detection of track errors in the tandem method. In this method a divided photodetector is placed in order in the direction of the disk track for tandem detection of the difference signals radially on the disk. The difference between the two emissions is then used for signal detection. In the optical disc format of the preferred embodiment of the invention described below, a sequence of pre-formatted pits is arranged in two parts compensated precisely half a pitch radially with respect to the disc, on both sides of the center track. When the radial difference signal is generated from the emission of the divided photodetector, the light beam is tracking either a center of projection or a center of groove except when it passes through the header area, and the radial difference is therefore both substantially equal to 0. When the light beam passes through PID1 and PID2 in the groove track header area, for example, it appears from the perspective of the focused scanning point that the scanning of the groove track makes the beam of light is compensated to the right from the center of the track in the direction of the path of the explorer point of the beam, that is, the side of the inner circumference, because the sequence of previously programmed pits is compensated by the outer circumference of the disk , that is, to the left in the direction of the path of the beam explorer. If the radial difference signal has positive polarity at this time, the difference signal has the maximum signal value. Note that the level of the level signal varies between 0 and the maximum level depending on whether the previously embossed graves are detected. The tandem individual beam optical system used for the track follower in the rewritable optical disc drive apparatus uses a difference signal detector radially to the disk. Signal difference detection of header information can be achieved by providing the detector system with the ability to transmit data bandwidth frequencies. Therefore, it is possible to improve the quality of the reproduction signal without substantially requiring additional components. The required signal amplitude can also be obtained by forming the pits with the same depth? / 6 as the grooves. This has the additional advantage of facilitating the fabrication of the master disc because the previously embossed pits and the grooves can be formed with the same depth. Taking into account these advantages, the header area containing the directional signal and other information is drilled from the previously embossed pits to allow activation using a radial difference signal. The conditions are controlled for the actual production of the disk, in such a way that the detection jitter is minimized when the header area is read by means of a radial difference signal. Note that there is little room for error detection and no benefit is obtained by applying additive signal detection to a disk so optimized for difference signal detection. As shown in Figure 5, if the direction of a sector of an area other than the outgoing-groove transition area is #n, which is a sector of groove in this example, and the number of sectors in a track is N , where n and N are both integers, then the direction of the disk revolution of sector one on the side of the outer circumference of the sector in the #n direction will be # (n + N). From there it follows that the sector direction at a disk revolution away from the address # (n + N) will be # (n + 2), the sector direction of the next adjacent track will be # (n + 3), The sector direction of the next adjacent track will be # (n + 4), and so on. In addition, although the physical shape of the adjacent sectors in the radial direction alternates in the groove pattern - salient - groove - protruding - groove - protruding -, the values of the sector direction increase continuously. Moreover, as shown in Figure 6, if the direction of a sector of the outgoing-groove transition area is #m, which is a sector of groove in this example, and the number of sectors in a track is N, in where my N are both integers, then the direction of the revolution of the disc of sector one on the side of the outer circumference of the sector in the address #m will be # (m + N). From there it follows that the sector direction at a disk revolution away from the address # (m + N) will be # (m + 2), the sector direction of the next adjacent track will be # (m + 3), the sector direction of the next adjacent track will be # (m + 4), and so on. The physical shape of the adjacent sectors in the radial direction alternates in the groove-protrusion-groove-outgoing-groove-protrusion-pattern in the groove-protrusion transition area, and the values of the sector direction also increase continuously. With this method of addresses the number of the sector address of each recording sector can simply be increased by 1 with respect to the previous sector address number, in the same sequence in which the sectors are recorded in the recording spiral. It should be noted that the sector addresses of a read-only optical disk are also numbered to match the sector sequence of the recording coil and, therefore, the same method is used to assign address numbers on a rewritable optical disk using a protrusion-groove recording track format in accordance with the present invention. Note, moreover, that by using the same address scheme it is easier to provide an apparatus compatible with sector address management in both read-only optical disc media and rewritable optical disc media in accordance with the present invention. It should also be noted that the PID arrays of the header area are also possible as shown in the Figure. This format is essentially the inverse of the one shown in Figure 5. and described above. More specifically, PID1 and PID2 in this format are offset% flute width to the inner circumference from the center of the flute in the heading area immediately preceding the data recording area in a flute track, and a flute track is written on PID3 and PID4 compensated% flute width to the outer circumference from the flute center of the same header area preceding the flute track data recording area on the inner circumference side of the flute track . As a result, the outgoing addresses are written in PID3 and PID4 of the heading area immediately preceding the data recording area where PID3 and PID4 are offset% of the groove width towards the inner circumference side of that outgoing center. Like the heading areas not located in this transition area, the format of the header areas that are in the transition-outgoing-groove area is, in this case, the inverse of that shown in Figure 6 and in Figure 8. Specifically, as in the header areas not located in this transition area, the groove directions are written in PID1 and PID2 in the header area immediately preceding the data track recording area of the groove. , where PID1 and PID2 are compensated% width of groove towards the inner circumference from the center of the groove. The outgoing addresses are written in PID3 and PID4 in the header area immediately preceding the data recording area of the groove track on the inner circumference side of that outgoing recording track, where PID3 and PID4 are compensated% width of groove towards the outer circumference from the center of the groove. As a result, the outgoing addresses are written in PID3 and PID4 of the header area immediately preceding the data recording area where PID3 and PID4 are offset% wide in groove to the inner circumference of that center of the outgoing. It should be noted that although the header format shown in Figure 7 and Figure 8 produces a physical sector and groove sector configuration that is different from that shown in Figure 5 and Figure 6, there is no change in the method of use sector address numbers that increase in sequence continuously. It is also possible, using the sector address arrangement described above, to place the addresses of the recording sector in the sector sequence of the recording spiral, even if a zone layout is used on the disc. Note that the zone format is used in the optical disc media according to the present invention. In this zone format, the number of sectors per recording track in each zone changes from 17 sectors per zone in the track of the inner circumference of the disk to 40 sectors per zone in the track of the outer circumference of the disk, increasing the number of sectors by zone one in each zone from the inner circumference to the outer circumference. The first recording track in each zone is a flute track and the last recording track in each zone is a saloon track. Each zone therefore contains an even number of recording tracks, and the recording tracks can be considered in pairs in which each pair comprises a groove track and the nose track which is on the side of the outer circumference of the groove track. The two tracks of each pair share the PID in the header area containing PID1 and PID 2 the direction of the recording sector of the outgoing track and PID3 and PID4 the direction of the recording sector of the flute track. The area on the inner circumference of the boundary of the area ends, therefore, with a protrusion track, and the direction sector of the protrusion track is recorded on PID1 and PID2 located between the runway and the runway. of groove on the side of the inner circumference of the outgoing track. The area on the outer circumference side of the zone boundary begins, therefore, with a groove track, and the direction of the sector of that groove track is recorded at PID3 and PID4 located between that groove track and the track. of projection on the side of the outer circumference of that groove track. By formatting the recording tracks in this way so that the pairs of tracks do not overlap the area limit, sector addresses can be assigned to the PID located between the spline track and the outgoing track without creating any address conflict. It should further be noted that correction of track compensation at low frequency can be achieved with the di format of the invention thus described. This is possible by using the symmetry of the amplitude of the signal caused by the reproduction of sequences of oscillation pits placed in the header area, while continuously applying tandem track servo control, so that the sequences reproduced the amplitude of the pit oscillation are equal and symmetrical. The optical disk of the present invention achieves the following effects through the configurations described in the previous embodiment. As described above, an optical disk according to the present invention comprises projection tracks and groove tracks connected to each other in an alternating sequence, divides a pit previously embossed into two segments and arranges those two compensated segments at the sides of the inner and outer circumference of the center of the groove track in an oscillating pattern. The directions of the track track recording sector and the addresses of the outgoing track recording sector are then assigned a number that increases by 1 in a simple numerical sequence that matches the sequence of the sectors in the recording spiral. The handling of sector addresses is facilitated, therefore, since the numbers of the sector addresses increase in a single continuous sequence, even when the physical form of the sectors alternates in a continuous pattern of groove-outgoing-groove. As also described above, read-only optical disc media for read-only digital video applications use the same address method in which a sequential address number is assigned to the recording sectors in the sequence in which they form in the recording spiral. As a result, the same sector address management method can be used, with said read-only optical disk means and the rewritable optical disk means in accordance with the present invention. Therefore, it is possible to achieve a rewritable optical disc using an individual spiral projection-spline format, by which compatibility with the read-only optical disc media can be easily guaranteed. Furthermore, it is therefore possible to easily guarantee the compatibility of the sector address handling in an apparatus for reproducing both rewritable optical disc media according to the present invention and read-only optical disc media. It is also possible to record within the limited byte capacity of the sector format an address signal containing information of the sector address that can be reproduced with practical reliability. Having described the invention, it will be apparent that it can be varied in many ways. Said variations will not be considered as a departure from the spirit and scope of the invention, and it is intended that all modifications that are apparent to the person skilled in the art be included in the scope of the following claims.

Claims

CLAIMS 1. An optical disk having a data recording area comprising: a disc substrate with grooves and projections between the grooves, a phase transformation recording film in the data recording area for recording information using the ends Initial and final recording marks produced by a localized change in the reflectivity made in the phase transformation film, by issuing there a laser beam of a particular wavelength? focused by a lens with a particular aperture NA, and a single recording spiral is formed by alternatingly connecting flute recording tracks equivalent to a disc circumference and output recording tracks equivalent to a disc circumference, with a pitch of p track where p < (? / NA) < 2p, wherein each recording track comprises a specular area that is simply a mirror surface area, and a pre-formatted header area with previously embossed pits that are detectable in a radial difference signal and represent information as information of address in which at least the address information recorded in the header field is modulated by modulation method limited by the length of the route, the header field comprises four physical address areas PID containing individual VFO frequency pattern for the synchronization clock generation and synchronization detection during playback, and an AM address mark for byte synchronization during header playback and the start of detection synchronization, a PID address area for retaining address information of sector, a detection area of IED address errors to store the address error detection code and a final PA synchronizer to complete the modulation, where the four PID physical address areas are labeled PID1, PID2, PID3 and PID4 from the first PID of the area of heading, with PID1 and PID2 compensated approximately p / 2 towards the outer circumference or the inner circumference from the center of the groove recording track, and PID3 and PID 4 compensated approximately p / 2 towards the inner circumference of the center of the track of a groove recording track, the direction of the outgoing recording sector, adjacent to the outer circumference side of a groove recording sector recorded in the PID address area of PID1 and PID2, and the direction of the recording sector of groove engraved in the address area Pid of PID3 and PID4, each numbered to increase 1 in the sector sequence of the spiral of gra The recording marks in said VFO are greater than the shorter recording mark of the modulation method, and the length of the VFO in PID1 and PID3 is sufficient to contain the ends of the sufficient recording marks to block the synchronization. of the playback clock within the VFO, and the length of the VFO in PID2 and PID4 is sufficient to contain the ends of the sufficient recording marks to reaffirm clock synchronization playback within the VFO, and the VFO areas in PID1 and PID3 are sufficiently longer than the VFO areas of PID2 and PID4, the AM address mark is longer than the largest recording mark of the modulation method and long enough to contain several channel bit patterns of a length of record mark that does not appear in the modulation bit sequence, the Pid is at least long enough to discriminate several recording sectors capable of storage nar data. If the user exceeds the recording capacity of the read-only optical disc medium, the IED is of a length that triggers the detection of PID playback errors of the address area with an error detection rate less than or equal to a particular, the final PA synchronizer has at least the length required by the modulation method and has a length that activates the termination of the recording marks, and the specular area is longer than the recording mark greater than the modulation method.
2. An optical disk having a data recording area comprising: a disc substrate with grooves and projections between the grooves, a phase transformation recording film in the data recording area for recording information using the initial ends and end of the recording marks produced by a localized change in the reflectivity effected in the phase transformation film, by emitting there a laser beam of a particular wavelength? focused by a lens with a particular aperture NA, and a single recording spiral is formed by alternately connecting flute recording tracks equivalent to a disc circumference and output recording tracks equivalent to a disc circumference, with a pitch of p track where p <; (? / NA) < 2p, wherein each recording track comprises a specular area that is simply a mirror surface area, and a pre-formatted header area with previously embossed pits that are detectable in a radial difference signal and represent information as information of address in which at least the address information recorded in the header field is modulated by modulation method limited by the length of the route, the header field comprises four physical address areas PID containing individual VFO frequency pattern for the synchronization clock generation and synchronization detection during playback, and an AM address mark for byte synchronization during header playback and the start of detection synchronization, a PID address area for retaining address information of sector, a detection area of IED address errors to store the address error detection code and a final PA synchronizer to complete the modulation, where the four PID physical address areas are labeled PID1, PID2, PID3 and PID4 from the first PID of the area of heading, with PID1 and PID2 compensated approximately p / 2 towards the outer circumference or the inner circumference from the center of the groove recording track, and PID3 and PID 4 compensated approximately p / 2 towards the inner circumference of the center of the track of a groove recording track, the direction of the outgoing recording sector, adjacent to the outer circumference side of a groove recording sector recorded in the PID address area of PID1 and PID2, and the direction of the recording sector of groove engraved in the address area Pid of PID3 and PID4, each numbered to increase 1 in the sector sequence of the spiral of g The recording marks in said VFO are greater than the shorter recording mark of the modulation method, and the length of the VFO in PID1 and PID3 is sufficient to contain the ends of enough recording marks to block the synchronization of the playback clock within the VFO, and the length of the VFO in PID2 and PID4 is sufficient to contain the ends of the sufficient recording marks to reaffirm clock synchronization playback within the VFO, and the VFO areas in PID1 and PID3 are sufficiently longer than the VFO areas of PID2 and PID4, the AM address mark is longer than the largest recording mark of the modulation method and long enough to contain several channel bit patterns of a length of record mark that does not appear in the modulation bit sequence, the Pid is at least long enough to discriminate several recording sectors capable of recording acceed user data that exceeds the recording capacity of read-only optical disc medium, the IED is of a length that triggers the detection of PID playback errors of the address area with an error detection rate less than or equal to at a particular rate, the final PA synchronizer has at least the length required by the modulation method and has a length that activates the termination of the recording marks, and the specular area is longer than the largest record mark of the method of modulation.
3. The optical disk according to claim 1 wherein the track pitch is 0.74 μm when the wavelength of the laser beam? is 650 nm and the NA lens aperture is 0.6, the modulation method is a method to modulate at a speed of 8 bits of data to 16 bits of channel being the shortest recording mark of 3 channel bits and the Longest 11-bit channel, the VFO is 36 bytes in PID1 and PID3 and 8 bytes in PID2 and PID4, the address mark AM is 3 bytes, the PID is 4 bytes, the IED is 2 bytes, the final synchronizer PA is 1 byte, and the specular area is 2 bytes.
4. The optical disk according to claim 2, wherein the track pitch is 0.74 μm when the wavelength of the laser beam? is 650 nm and the NA lens aperture is 0.6, the modulation method is a method to modulate at a speed of 8 bits of data to 16 bits of channel being the shortest recording mark of 3 channel bits and the Longest 11-bit channel, the VFO is 36 bytes in PID1 and PID3 and 8 bytes in PID2 and PID4, the address mark AM is 3 bytes, the PID is 4 bytes, the IED is 2 bytes , the final PA synchronizer is 1 byte, and the specular area is 2 bytes.