Optical recording medium, method of managing defective area thereof, recording method thereof, and recording/reproducing apparatus thereof

• US 20050210319A1
• Filed: 07/15/2004
• Published: 09/22/2005
• Est. Priority Date: 07/15/2003
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jin Yong, Suh, Sang Woon
• Granted Patent: US 7,539,100 B2
• Time in Patent Office: Days
• US Class Current: 714/8
• CPC Class Codes: G11B 20/1883 Methods for assignment of alternate areas for defective areas
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers

Abstract

The present invention provides a method of managing a defective area of an optical disc recordable at high speed, recording/reproducing method thereof, and recording/reproducing apparatus thereof, by which an accurate decision of the defective area is provided. Moreover, as optimal recording speed is applicable to re-recording in a specific section, thereby enabling to secure high reliance of data. In an optical disc provided with a defect management area for defect management within a high-speed recordable disc, the present invention includes verifying whether the defective area is generated in performing a recording at high speed, re-verifying presence or non-presence of defect of a corresponding area by changing a recording speed into low speed if the defective area is generated at the high speed, and recording to manage in the defect management area a location information of an area decided as the defective area at the high speed but as a non-defective area at the low speed.

Claims

1. A method of managing a defective area in an optical recording medium, comprising the steps of:

checking whether a defective area is found at second recording speed, the defective area found at first recoding speed, the second recording speed lower than the first recording speed; and

determining whether to replace the defective area with a replacement area based on the checking step.

2. The method of claim 1, wherein data to be recorded in the defective area are recorded in the replacement area if the defective area is found at the second recording speed.

3. The method of claim 2, further comprising:

recording a management information to indicate a location of the defective area and a location of the replacement area.

4. The method of claim 3, wherein the management information further includes a status information that the defective area is replaced with a replacement area.

5. The method of claim 1, wherein data to be recorded in the defective area are recorded in the corresponding area if the defective area is not found at the second recording speed.

6. The method of claim 5, further comprising:

recording a management information to indicate at least a location of the defective area.

7. The method of claim 6, wherein the management information further includes a status information that the defective area is not replaced.

8. The method of claim 6, wherein the management information further includes-a speed information of the second speed.

9. The method of claim 6, wherein the management information further includes a speed information of the first speed.

10. The method of claim 6, wherein the management information is recorded as one entry per a minimum recording unit.

11. The method of claim 10, wherein the minimum recording unit is one cluster.

12. The method of claim 6, wherein the management information is recorded as one entry a consecutive minimum recording unit.

13. The method of claim 12, wherein the entry includes an information designating a number of the consecutive minimum recording unit.

14. The method of claim 12, wherein the minimum recording unit is one cluster.

15. The method of claim 6, wherein the location information includes a start position of the defective area and an end position of the defective area.

16. The method of claim 15, wherein the management information further includes a speed information of first recording speed or second recording speed.

17. The method of claim 16, wherein the start position and the end position of the defective area and the speed information are recorded by a plurality of entries.

18. The method of claim 17, wherein a plurality of the entries comprises a first entry including the start position and the end position and a second entry including the speed information of the corresponding area.

19. The method of claim 18, wherein an identification information for identifying the first and second entries is recorded in the corresponding entry.

20. A method of managing a defective area of an optical recording medium, comprising the steps of:

recording first entry including a first location information of a first area decided as the defective area at first recording speed but as a non-defective area at second speed, the second speed lower than the first speed; and

recording second entry including a second location information of a second area decided as the defective area at both of the first speed and second speeds

21. The method of claim 20, further comprising:

recording an identification information identifying the corresponding entry in each of the first and second entries.

22. The method of claim 21, wherein the first entry further includes a recording speed information of the first area decided as the non-defective area.

23. The method of claim 21, wherein the second entry further includes a location information for a replacement area informing that data to be recorded in the defective area is recorded in a replacement area.

24. A method of managing a defective area of an optical recording medium, comprising:

verifying whether the defective area is generated in performing a recording at an applicable maximum speed;

re-verifying presence or non-presence of defect of a corresponding area by changing a recording speed into an intermediate speed lower than the applicable maximum speed at least one time if the defective area is generated at the applicable maximum speed;

re-verifying the presence or non-presence of the defect of the corresponding area by changing the recording speed into a minimum speed if the defective area is generated at the intermediate speed; and

recording a location information of an area decided as the defective area at a specific area of the optical recording medium according to a result of each of the first to third steps.

25. The method of claim 24, wherein for the area decided as the defective area at the first step but as a non-defective area at the second step, the location information of the corresponding area is recorded at the specific area.

26. The method of claim 25, wherein a recording speed information applied to the second step is further recorded at the specific area.

27. The method of claim 25, wherein a recording speed information applied to the first step is further recorded at the specific area.

28. The method of claim 24, wherein for the area decided as the defective area at the first and second steps but as a non-defective area at the second step, the location information of the corresponding area is recorded at the specific area.

29. The method of claim 28, wherein a recording speed information applied to the third step is further recorded at the specific area.

30. The method of claim 28, wherein a recording speed information applied to the second step is further recorded at the specific area.

31. The method of claim 24, wherein for the area decided as the defective area at the first to third steps, the location information of the corresponding area is recorded at the specific area.

32. The method of claim 31, wherein another location information of a replacement area for the defective area is further recorded at the specific area.

33. A recording medium, comprising:

a defect management area for managing a defective area; and

a data area recording data therein,

wherein the defect management area includes at least first entry to record location information decided as a defective area at a first speed but as a non-defective area at a second speed, the first speed higher than the second speed.

34. The recording medium of claim 33, wherein the first entry further includes a speed information of the first or second recording speed.

35. The recording medium of claim 34, wherein the first entry further includes a status information that the defective area is not replaced.

36. The recording medium of claim 33, further comprising:

second entry provided within the defect management area to record another location information decided as the defective area at the first and second speeds.

37. The recording medium of claim 36, wherein the second entry further includes a speed information of the first or second recording speed.

38. The recording medium of claim 36, wherein the second entry further includes a location information of replacement area for the defective area.

39. The recording medium of claim 36, wherein the second entry further includes a status information that the defective area is replaced with a replacement area.

40. A method for recording data on an optical recording medium, comprising the steps of:

receiving a recording command for a specific area;

verifying whether a defective area is generated on the specific area at a first speed;

re-verifying presence or non-presence of defect of a corresponding area by changing a recording speed into a second speed if the defective area is generated at the high speed, the second speed lower than the first speed;

recording data to be recorded in a first area decided as the defective area at both of the first and second speeds in a replacement area as a result of re-verifying step; and

recording data at the second speed on a second area decided as the defective area at the first speed but as a non-defective area at the second speed.

41. A method for recording data on an optical recording medium, comprising the steps of:

deciding a recording speed applicable to a specific area within the optical recording medium by reading a location information of a defective area and a recording speed information of the corresponding defective area from a defect management area within the optical recording medium; and

performing the recording of data at the decided recording speed if receiving a recording command for the specific area.

42. An apparatus for recording or reproducing data on or from the optical recording mediu, comprising:

a pickup unit recording or reading data on or from the optical recording medium; and

a controller verifying whether a defective area is generated on the specific area at a first speed, re-verifying presence or non-presence of defect of a corresponding area by changing a recording speed into a second speed if the defective area is generated at the first speed, controlling the pickup to record data to be recorded in a first area decided as the defective area at both of the first and second speeds in a replacement area, and controlling the pickup to record data at the second speed on a second area decided as the defective area at the first speed but as a non-defective area at the second speed.