HK1079891B - Recording/reproducing method for optical information storage medium - Google Patents

Description

Recording/reproducing method for optical information storage medium

Technical Field

The present invention relates to an optical information storage medium and a recording/reproducing method therefor, and more particularly, to an optical information storage medium on which optical information has the same channel characteristics or on which different recording speed information is recorded, and a recording/reproducing method for the optical information storage medium.

Background

Optical discs or optical information storage media are widely used in optical pickup devices that record/reproduce information in a non-contact manner. Types of optical disks are Compact Disks (CDs), Digital Versatile Disks (DVDs), and high-density DVDs (HD-DVDs). Optical disks on which data can be recorded, erased, and reproduced are CD-R, CD-RW, DVD-RAM, DVD + RW, and the like.

As the recording density of these optical discs increases, the performance of the disc drive is improved. When the disc drive satisfies the recording characteristics of the optical disc, data can be reliably recorded and reproduced since the recording characteristics of such an optical disc match the recording speed of the disc drive. However, a general disc drive can reliably record data on a low-speed disc, which does not satisfy the recording characteristics of a high-speed disc, and thus it may frequently damage user data. A disc drive for a high-speed disc may also damage user data when recording data on a low-speed disc.

Therefore, recording speed information is required to reliably record data. To obtain this information, the recording speed of the data is recorded. To obtain this information, the recording speed of the disc is recorded in a predetermined area of the disc, and the disc drive recognizes a desired recording speed of the disc and records data at the desired predetermined recording speed of the disc. For example, in the case of a 2X-speed disc, the recording speed of the disc is recorded in a predetermined area of the disc before shipment thereof, and thus the disc drive can record data with reference to a recording characteristic according to the recording speed of the disc recorded thereon.

Very frequently, however, the recording speed of the disc does not reach the nominal recording speed of the disc during testing. For example, after a 4X speed disc is manufactured and the recording speed of the disc is recorded in a predetermined area of the disc, the real recording speed of the disc does not actually reach the 4X speed. At this time, such a disc cannot be used as a 4X speed disc, but it can be appropriate as a 3X speed disc or a 2X speed disc. Then, since the recording speed is 4X speed, the disc drive recognizes the disc as a 4X speed disc, and thus it tries to record data at 4X speed. However, since the recording speed does not actually reach the 4X speed, user data cannot be normally recorded and may be damaged. Therefore, a 4X-speed disc that can be properly used as a 3X-speed disc or a 2X-speed disc is inevitably discarded as a defective disc.

Therefore, a method of using such a disc is required, and in order to cope with a case where the recording speed of the disc is lowered due to various manufacturing conditions of the disc, a subsequent process is required.

Disclosure of Invention

According to another aspect of the present invention, there is provided a method of recording or reproducing data in or from an optical information storage medium consisting of a lead-in area, a user data area, and a lead-out area, the method including: recording formal recording speed information reproduced through the differential signal channel or the sum channel in a read-only data zone of at least one of the lead-in area and the lead-out area; recording maximum recordable speed information reproduced through the sum channel in a re-recordable data zone of at least one of the lead-in area and the lead-out area; and recognizing the maximum recordable speed information using the disc drive and recording data on the optical information storage medium at a speed not greater than the maximum recordable speed.

According to another aspect of the present invention, there is provided a method of recording or reproducing data in or from an optical information storage medium consisting of a lead-in area, a user data area, and a lead-out area, the method including: recording formal recording speed information reproduced through the differential signal channel or the sum channel in a read-only data zone of at least one of the lead-in area and the lead-out area; recording recordable speed information reproduced through the sum channel in a re-recordable data zone of at least one of the lead-in area and the lead-out area; and recognizing the recordable speed information using the disc drive and recording data on the optical information storage medium at a corresponding speed indicated in the recordable speed information.

Drawings

The above and other aspects and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:

fig. 1 illustrates a structure of a lead-in area of an optical information storage medium according to the present invention;

fig. 2 illustrates a portion of a data structure of an optical information storage medium;

fig. 3A is a schematic view for explaining an optical information storage medium and a recording/reproducing method therefor according to a first embodiment of the present invention;

fig. 3B is a schematic view for explaining an optical information storage medium and a recording/reproducing method therefor according to a second embodiment of the present invention;

fig. 4 is a schematic view for explaining an optical information storage medium and a recording/reproducing method therefor according to a third embodiment of the present invention; and

fig. 5 is a block diagram illustrating a method of determining a recording speed of an optical information storage medium according to the present invention.

Detailed Description

Fig. 1 schematically illustrates the structure of a lead-in area, a user data area, and a lead-out area of an optical information storage medium. The lead-in area is formed of pits (pits) or in a high frequency wobble at the innermost circumference of the disc and includes a read-only data area 10, a connection area 20, and a re-recordable data area 30. The read-only data zone 10 contains basic information about the disc.

The read-only data zone 10 includes a disc information zone 10a in which a formal recording speed of the disc is recorded. The formal recording speed of a disc denotes a recording speed determined during the design of the disc or in a format describing the disc. For example, formal recording speed information, which is read-only data, may be recorded in land pre-pits (LPPs) or pits or as a high frequency wobble signal. In this regard, a high frequency jitter signal is disclosed in korean patent application No. 2001-023747, which was filed by the applicant of the present invention, and represents a jitter signal having a relatively higher frequency than a jitter signal formed in a user data area. The formal recording speed information recorded in the high frequency wobble is reproduced using a differential signal channel ch2 using a push-pull signal. The formal recording speed information recorded in pits is reproduced using the sum channel ch 1. When data is recorded on the disc, the formal recording speed for the disc, which is recorded as described above, is recognized by the disc drive so that user data can be recorded at an optimal recording speed.

The size of the disc, version number, recording conditions, and the like are also recorded in the disc information area 10 a.

The connection zone 20 may include a transition zone connecting the read-only data zone 10 to the re-recordable data zone 30. The connection area 20 may be a mirror area or may be a wobbled groove area.

The re-recordable data zone 30 may include a disc test zone 30a, a drive test zone 30b, a disc control data zone 30c, and a defect management zone 30 d. The disc control data zone 30c includes at least one disc control area in which information regarding disc control is recorded. For example, first to fourth disc control areas 30c-1, 30c-2, 30c-3, and 30c-4 are included. At least one reserved area, for example two reserved areas 30c-5 and 30c-6, may also be included to record other information.

Since the lead-out area has a similar structure to the lead-in area, the lead-out area will not be described in detail.

Ideally, the optical information storage medium must be capable of recording data according to the formal recording speed information recorded in the disc-related information area 10 a. Then, in practice, the formal recording speed does not satisfy the predetermined recording characteristics according to the formal recording speed information due to errors generated during the manufacture of the optical information storage medium. Therefore, data is recorded at a speed lower than the formal recording speed. In this case, not the formal recording speed, but effective recording speed information that can be recorded and satisfies a predetermined recording characteristic needs to be newly recorded.

In a recording/reproducing method for an optical information storage medium according to a first embodiment of the present invention, a maximum recordable speed is recorded in a recordable zone of an area other than a user data area. For example, the maximum recordable speed information may be recorded in a predetermined area of the re-recordable data zone 30. Meanwhile, the maximum recordable speed information, which is data reproduced using the sum channel ch1, may be recorded in the same manner as data is recorded in the user data area.

Referring to fig. 2, a predetermined area of the re-recordable data zone 30 is composed of a plurality of bytes, and the maximum recordable speed information can be stored in one byte among the plurality of bytes. For example, the re-recordable data zone 30 stores a recordable speed flag or a recordable speed code using at least one bit of a zero Byte Position (BP)35 existing in a predetermined area or a bit combination of a predetermined byte, respectively. Although the maximum recordable speed is recorded at the zero BP 35 in fig. 2, it may be recorded at a desired BP other than the zero BP. The maximum recordable speed information can also be recorded using a plurality of bytes instead of one byte.

As shown in fig. 3, observing the internal structure of the zero BP 35, the zero BP 35 is composed of 8 bits, i.e., first to seventh bits b0 to b 7. For example, a recordable speed flag or code using a bit combination of a predetermined byte may be recorded using the seventh and sixth bits b7 and b 6. The other bits are reserved. For example, if the formal recording speed is 5X, the seventh and sixth bits are recorded as 00b, which represents the fact that data can be recorded according to the formal recording speed. That is, data can be recorded at a maximum recordable speed of 5X. If the seventh and sixth bits are recorded as 01b, data can be recorded at a maximum recordable speed of 2X and cannot be recorded at a speed higher than 2X. If they are recorded as 10b, data can be recorded at a maximum recordable speed of 3X. If the seventh and sixth bits are recorded as 11b, data can be recorded at a maximum recordable speed of 4X.

If the formal recording speed is 3X and the seventh and sixth bits are recorded as 00b, data can be recorded according to the formal recording speed of 3X. If they are recorded as 01b, data can be recorded at a maximum recordable speed of 2X, and cannot be recorded at a speed higher than 2X.

In order to apply the internal structure of the zero BP 35 to a disc designed to have a recording speed exceeding 6X, three bits may be used to record data. For example, if the formal recording speed exceeds 6X, 000b indicates that data can be recorded at a maximum recordable speed of 6X and cannot be recorded at a recording speed higher than 6X. Similarly, 001b indicates that data can be recorded at the maximum recordable speed of 2X, and 010b indicates that data can be recorded at the maximum recordable speed of 3X. When the maximum recordable speed is recorded as 00b or 000b, data can be recorded at the formal recording speed.

In the above embodiments, the maximum recordable speed is recorded using 2 or 4 bits. However, the maximum recordable speed can be recorded using 4 to 8 bits. In other words, the recordable effective recording layer information may be recorded using at least one bit or a bit combination of bytes in the re-recordable area. Obviously, a plurality of bytes may also be used instead of one byte.

As described above, the maximum recordable speed is recorded in a predetermined area of the re-recordable data zone of at least one of the lead-in area and the lead-out area. Then, the disc drive records data at an optimum recording speed according to the maximum recordable speed.

Preferably, the maximum recordable speed information may be recorded in at least one of the disc control data areas 30c-1, 30c-2, 30c-3, and 30c-4 of the disc control data zone 30 c. Alternatively, the maximum recordable speed information may be recorded in the reserved areas 30c-5 and 30 c-6. In the above, the case where the maximum recordable speed is recorded in the re-recordable data zone of the lead-in area has been described. However, the maximum recordable speed information may be recorded in a re-recordable data zone of a lead-out area disposed on one side of the outer circumference of the storage medium.

In order to increase reliability, the maximum recordable speed information may be redundantly recorded in the recordable data zones of the lead-in and lead-out areas.

However, the optical information recording medium according to the first embodiment of the present invention stores maximum recordable information in a predetermined area of the re-recordable data zone of at least one of the lead-in and lead-out areas. The maximum recordable speed information may be recorded as a speed flag or code using at least one bit or a bit combination of a predetermined byte. Alternatively, a plurality of bytes may be used to record the maximum recordable speed information.

Although the maximum recordable speed is recorded in the zero BP as described above, the maximum recordable speed information may also be recorded in a BP other than the zero BP.

In the recording/reproducing method for an optical information recording medium according to the second embodiment of the present invention, the maximum recordable speed is recorded in all bits of the recordable zone constituting the area other than the user data area. For example, the maximum speed information may be recorded in a predetermined area of the re-recordable data zone 30. Here, the re-recordable data zone 30 is also included in the lead-out area.

The maximum and minimum recordable speed information may be recorded in a predetermined area, for example, the disc control data areas 30c-1, 30c-2, 30c-3, and 30c-4 or the reserved areas 30c-5 and 30c-6 in the re-recordable data zone 30. Referring to fig. 3B, the disc control data areas 30c-1, 30c-2, 30c-3, and 30c-4 or the reserved areas 30c-5 and 30c-6 are composed of a plurality of bytes. The maximum and minimum recordable speed information is recorded using all 8 bits constituting each byte. Here, the maximum and minimum recordable speed information, which is data reproduced using the sum channel ch1, may be recorded in the same manner as data is recorded in the user data area.

In order to increase reliability, maximum and minimum recordable speed information may be redundantly recorded in the recordable data zones of the lead-in and lead-out areas.

More specifically, the following shows a case where the formal recording speed is 8X, but it is actually determined that the disc records data at 5-7X when a test of the recording characteristics of the disc is performed. Here, the maximum recordable speed is 7X, and the minimum recordable speed is 5X. Referring to fig. 3B, the maximum recordable speed is recorded in seven to four bits B7, B6, B5, and B4, and the minimum recordable speed is recorded in three to zero bits B3, B2, B1, and B0. As described above, the maximum or minimum recordable speed can be recorded using 4 bits in the following table.

TABLE 1

Bits	Recording speed
		0000b	2X
0001b	3X
		0010b	4X
0011b	5X
		0100b	6X
0101b	7X
		0110b	8X
0111b	9X

Referring to table 1, the recording speed 5X-7X may be represented as 01010011 b. Here, the maximum recordable speed and the minimum recordable speed are expressed using a combination of four bits. However, the maximum recordable speed and the minimum recordable speed may be expressed using a combination of two or three bits.

In the recording/reproducing method for an optical information recording medium according to the second embodiment of the present invention, maximum and minimum recordable speeds are recorded in all bits of a recordable zone constituting an area other than a user data area. The maximum and minimum recordable speed information may be recorded using a combination of two to four bits, or the maximum and minimum recordable speed information may be recorded in different BPs.

An optical information storage medium and a recording/reproducing method therefor according to a third embodiment of the present invention will now be described.

According to the third embodiment, by using each bit, a recordable speed is recorded in a predetermined area of a re-recordable area of at least one of the lead-in and lead-out areas.

For example, recordable speed information can be recorded in the disc control data areas 30c-1, 30c-2, 30c-3, and 30c-4 or the reserved areas 30c-5 and 30c-6 using bits or bit combinations in predetermined areas of the re-recordable data zone 30 shown in fig. 1. The disc control data areas 30c-1, 30c-2, 30c-3, and 30c-4 or the reserved areas 30c-5 and 30c-6 are composed of a plurality of bytes, and the recordable speed is recorded by using 8 bits of one byte of the plurality of bytes.

More specifically, each bit of the BP corresponds to a different recordable speed, and corresponding recordable speed information is recorded by using each bit. For example, each bit and the corresponding recordable speed are as follows.

TABLE 2

BP	Recordable speed
		7b	2X
6b	3X
		5b	4X
4b	5X
		3b	6X
2b	7X
		1b	8X
0b	9X

Referring to table 2, all recordable speeds can be represented by recording recordable speed information at corresponding bit positions. That is, if 0b is recorded in the seventh bit 7b, data can be recorded at 2X. If 1b is recorded in the seventh bit 7b, data cannot be recorded in 2 ×. If 0b is recorded in the sixth bit 6b, data can be recorded at 3X. If 1b is recorded in the sixth bit 6b, data may not be recorded at 3X. The same applies to the fifth to zeroth bits 5b, 4b, 3b, 2b, 1b, and 0b, so that recordable speed information can be recorded at corresponding bit positions.

In the third embodiment, if the formal recording speed is 9X and the disc satisfies the predetermined recording characteristics of a 5X-7X disc when the recording characteristics of the disc are tested, the recordable speed may be recorded as 11100011b with reference to table 2.

To increase reliability, recordable speeds may be redundantly recorded in the recordable data zones of the lead-in and lead-out areas.

Information on the recording possibility of a specific speed may also be recorded as follows.

TABLE 3

BP	Recordable speed
		7b	Speed 1
6b	Speed 2
		5b	Speed 3
4b	Speed 4
		3b	Speed 5
2b	Speed 6
		1b	Speed 7
0b	Speed 8

For example, if the velocity 1 is 3m/s, the velocity 2 is 5m/s, the velocity 3 is 7m/s, and the seventh bit 7b, the sixth bit 6b, and the fifth bit 5b are 0b, 1b, and 1b, respectively, in table 3, recording is performed only at the velocity 3 m/s. If these bits are 0b, and 1b, respectively, recording speeds of 3m/s and 5m/s are possible. Here, the recording speed may be a real number and a natural number.

Fig. 5 is a block diagram illustrating a method of determining a recording speed of an optical information storage medium according to the present invention. To record information on a disc, first, the disc is loaded in a disc drive, and a formal recording speed, which is a piece of disc-related information, is read from a predetermined area of the disc as a sum channel ch1 or a differential signal channel ch2 using a push-pull signal and stored in a memory. Next, recordable speed information is reproduced by the sum channel ch1 from at least one of the lead-in and lead-out areas. Finally, data is recorded according to recordable speed information reproduced through the sum channel. The recording conditions are provided when disc-related information corresponding to the recording conditions related to a specific recording speed specified on the disc as shown in table 3 is read.

In the second and third embodiments, since all recordable speeds can be mentioned, more accurate specific recordable speed information can be provided. In particular, a disc drive designed for a disc having a low recording speed may not be compatible with a disc having a high recording speed since the recording speed of the disc becomes higher. For example, a disc drive designed for a disc having a speed lower than 5X may not normally record data on a disc having a recording characteristic according to a recording speed higher than 5X. However, since information on all recordable speeds is recorded on an optical disc, the disc drive can easily manage the optical disc.

In addition, if version-related information according to the disc standard is recorded in the disc-related information area 10a together with the recording speed information, the disc drive can also easily manage disc standard-related problems. Data is recorded and reproduced by a disc drive corresponding to the version recorded in the disc-related information area 10 a. However, if the version is upgraded, the disk drive may have difficulty in reading the upgraded disk version. Accordingly, although the disc drive satisfies the recording characteristics of the disc, the disc drive may not record or reproduce data due to an error generated in connection with the upgraded disc version.

For example, if the recording speed is 1X to 3X of the 1.0 disc version and the recording speed is 2X to 5X of the 2.0 disc version, the 1.0 disc drive may not normally record or reproduce data to or from the 2.0 disc version. However, a drive of a 1.0 disc version can record data at 2X or 3X, considering only the recording characteristics of a disc drive. In this case, according to the present invention, data can be recorded using the recordable speed recorded in the re-recordable area despite a change in disc version. That is, if the disc drive satisfies the recording characteristics using the recordable speed information reproduced by the sum channel ch1, the disc drive records data regardless of the version of the disc.

The first to third embodiments of the present invention may be applied to a multilayer optical information storage medium. A speed mark or code representing such recordable speed information must be recorded only by a disc manufacturer and prevented from being changed or erased by a disc drive after selling the disc.

Industrial applicability

As described above, the optical information storage medium and the recording/reproducing method performed in the storage medium according to the present invention overcome a case where all recording layers cannot satisfy formal recording speed information due to errors generated during the manufacture of the storage medium. In particular, with the recent trend toward higher recording capacities, the demand for optical information storage media and methods according to the present invention increases.

In the optical information storage medium and the recording/reproducing method therefor according to the present invention, a defective disc ratio can be reduced and loss of user data due to application of inaccurate recording layer information can be prevented.

Claims (16)

1. A method of recording or reproducing data in or from an optical information storage medium consisting of a lead-in area, a user data area, and a lead-out area, the method comprising:

recording formal recording speed information in a read-only data area of at least one of the lead-in area and the lead-out area;

recording maximum recordable speed information in a re-recordable data zone of at least one of the lead-in area and the lead-out area; and

the maximum recordable speed information is recognized using a disc drive and data is recorded at a speed not greater than the maximum recordable speed.

2. The recording/reproducing method of claim 1, wherein the formal recording speed information is recorded in a high frequency wobble or pits.

3. The recording/reproducing method of claim 1 or 2, wherein the maximum recordable speed information is redundantly recorded in the re-recordable data zones of the lead-in and lead-out areas.

4. The recording/reproducing method of claim 3, wherein the re-recordable data zone comprises a disc control data zone having at least one disc control data area in which disc control data is recorded and a reserved area, and the maximum recordable speed information is recorded in the at least one disc control data area or the reserved area.

5. The recording/reproducing method of claim 1, 2, or 4, wherein the maximum recordable speed information is recorded as a recording layer flag or code using at least one bit or a bit combination of a predetermined byte in the re-recordable data zone.

6. The recording/reproducing method of claim 3, wherein the maximum recordable speed information is recorded as a recording layer flag or code using at least one bit or a bit combination of a predetermined byte in the re-recordable data zone.

7. The recording/reproducing method of claim 1, wherein the minimum recordable speed information is also recorded in the re-recordable data zones of the lead-in and lead-out areas.

8. The recording/reproducing method of claim 7, wherein the re-recordable data zone comprises a disc control data zone having at least one disc control data area in which disc control data is recorded and a reserved area, and the maximum recordable speed information and the minimum recordable speed information are recorded in the at least one disc control data area or the reserved area.

9. The recording/reproducing method of claim 7, wherein the maximum recordable speed information and the minimum recordable speed information are recorded as a recording layer flag or code using at least one bit or a bit combination of a predetermined byte in the re-recordable data zone.

10. The recording/reproducing method of claim 7, wherein the optical information storage medium performs recording at a speed not greater than the maximum recordable speed and not less than the minimum recordable speed by using the maximum recordable speed information and the minimum recordable speed information regardless of a version of the disc.

11. The recording/reproducing method of claim 10, wherein the optical information storage medium has a plurality of recording layers.

12. A method of recording or reproducing data in or from an optical information storage medium consisting of a lead-in area, a user data area, and a lead-out area, the method comprising:

recording formal recording speed information in a read-only data area of at least one of the lead-in area and the lead-out area;

recording recordable speed information in a re-recordable data zone of at least one of the lead-in area and the lead-out area;

the recordable speed information is recognized using the disc drive and data is recorded at a corresponding speed indicated in the recordable speed information.

13. The recording/reproducing method of claim 12, wherein the formal recording speed information is recorded in a high frequency wobble or a pit.

14. The recording/reproducing method of claim 12 or 13, wherein the recordable speed information is recorded as a recording layer flag or code using at least one bit or a bit combination of a predetermined byte in the re-recordable data zone.

15. The recording/reproducing method of claim 12 or 13, wherein the re-recordable data zone comprises a disc control data zone having at least one disc control data area in which disc control data is recorded and a reserved area, and the recordable speed information is recorded in the at least one disc control data area or the reserved area.

16. The recording/reproducing method of claim 12 or 13, wherein the optical information storage medium performs recording by using the recordable speed information regardless of a version of the disc.