Apparatus and method for providing uninterrupted continuous play during a change of sides of a dual-sided optical disk

• US 6,504,798 B1
• Filed: 10/20/1998
• Issued: 01/07/2003
• Est. Priority Date: 10/20/1998
• Status: Expired due to Term

• Current Assignee: Mei California, Inc. (Micron Technology, Inc.)
• Original Assignee: Micron Technology, Inc.
• Inventors: Revis, Paul A.
• Primary Examiner(s): PSITOS, ARISTOTELIS
• Application Number:
  US09/176,261
• Time in Patent Office: 1,540 Days
• Field of Search: 369/32, 369/30.23, 369/30.27, 369/195, 360/61, 360/63, 386/126, 386/125
• US Class Current: 369/30.23
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/127 involving detection of the number of sides, e.g. single or double, or layers, e.g. for multiple recording or reproducing layers
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 2007/0013 for carriers having multiple discrete layers
• CPC Class Codes: G11B 2020/1062 Data buffering arrangements, e.g. recording or playback buffers
• CPC Class Codes: G11B 2220/213 Read-only discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/08594 to access both sides of the disc with the same head assembly
• CPC Class Codes: G11B 7/24038 Multiple laminated recording layers

Abstract

An apparatus and method for providing continuous uninterrupted playback of a dual sided optical disk during side-to-side changing of the optical disk. The point at which a dual-sided optical disk will be switched between sides is determined. At some point prior to the switching of sides of the disk, a portion of the data at the end of the first side of the disk is transferred to a memory. During the switching of the disk to the second side, the stored data is read out from the memory to provide uninterrupted continuous playback of the optical disk.

Claims

1. A method for reading a first and second side of a dual sided optical disk comprising:

determining a point when reading said dual sided optical disk should be switched from said first side to said second side;

storing a portion of data from said first side of said dual sided optical disk in a memory, said portion of data corresponding to an amount of time required to switch said reading of said dual sided optical disk from said first side to said second side and comprising data from said determined point on said first side of said dual sided optical disk up to an end of said first side of said dual sided optical disk;

reading data from said first side of said dual sided optical disk;

switching said reading of said dual sided optical disk from said first side to said second side when said determined point has been reached; and

reading said data from said first side of said dual sided optical disk stored in said memory while said switching is occurring, reading said data stored in said memory taking an amount of time greater than an amount of time required to switch said reading of said dual sided optical disk from said first side to said second side.

2. The method according to claim 1, further comprising:

reading data from said second side of said dual sided optical disk after said data stored in said memory has been read.

3. The method according to claim 1, wherein said switching further comprises:

using a transfer mechanism to flip said dual sided optical disk.

4. The method according to claim 1, wherein said switching further comprises:

rotating an optical reader used to read said dual sided optical disk.

5. The method according to claim 1,wherein said switching further comprises:

moving an optical pickup from said first side of said dual sided optical disk to said second side of said dual sided optical disk.

6. The method according to claim 1, wherein said switching further comprises:

using a first optical pickup to read said first side of said dual sided optical disk; and

using a second optical pickup to read said second side of said dual sided optical disk.

7. The method according to claim 1, wherein said determining a point when said reading said dual sided optical disk will be switched is performed by a disk drive controller.

8. The method according to claim 7, wherein said determining a point when said reading said dual sided optical disk will be switched includes using a microprocessor in said disk drive controller to determine a point when said reading said dual sided optical disk will be switched.

9. The method according to claim 1, wherein said storing a portion of said data in a memory includes storing a portion of said data in a dedicated memory device adapted to store said data from said dual sided optical disk.

10. The method according to claim 1, further comprising:

outputting said data read from said dual sided optical disk to an output device.

11. A method for providing uninterrupted continuous playback of data read from a first and second side of a dual sided optical disk comprising:

storing a portion of data from said first side of said dual sided optical disk in a memory;

reading data not included in said portion of data stored in said memory from said first side of said dual sided optical disk;

reading said portion of data stored in said memory after reading said data not included in said portion of data stored in said memory;

switching said dual sided optical disk from said first side to said second side concurrently with said reading said portion of data stored in said memory; and

reading data from said second side of said dual sided optical disk after reading said portion of data stored in said memory.

12. The method according to claim 11, wherein said storing a portion of data includes storing a portion of data corresponding to data located at an end of said first side of said dual sided optical disk.

13. The method according to claim 11, wherein said storing a portion of data from said first side of said dual sided optical disk in a memory further comprises determining an amount of data to be included in said portion of data from said first side to be stored in said memory.

14. The method according to claim 13, wherein said determining includes using a processor to determine an amount of data to be included in said portion.

15. The method according to claim 13, wherein an amount of time required to read said data included in said portion of data stored in said memory corresponds to an amount of time required to switch said dual sided optical disk from said first side to said second side.

16. The method according to claim 13, wherein said switching said dual sided optical disk further comprises flipping said dual sided optical disk from said first side to said second side.

17. An apparatus for reading a first and second side of a dual sided optical disk comprising:

an optical disk reader;

a memory connected to said optical disk reader; and

a controller cooperating with said optical disk reader and said memory to;

store a portion of data from said first side of said dual sided optical disk in said memory;

read data not included in said portion of data stored in said memory from said first side of said dual sided optical disk;

read said portion of data stored in said memory after reading said data not included in said portion of data stored in said memory;

switch said dual sided optical disk from said first side to said second side concurrently with said reading said portion of data stored in said memory; and

read data from said second side of said dual sided optical disk after reading said portion of data stored in said memory.

18. The apparatus according to claim 17, wherein said controller determines a point on said first side of said disk when reading said dual sided optical disk should be switched from said first side to said second side.

19. The apparatus according to claim 18, wherein said portion of data stored in said memory comprises data from said determined point on said first side of said dual sided optical disk up to an end of said first side of said dual sided optical disk.

20. The apparatus according to claim 18, wherein said controller comprises a microprocessor.

21. The apparatus according to claim 17, wherein said dual sided optical video disk is a DVD.

22. The apparatus according to claim 17, further comprising:

a transfer mechanism to flip said dual sided optical disk from said first side to said second side.

23. The apparatus according to claim 17, wherein said optical disk reader rotates around an axis.

24. The apparatus according to claim 17, wherein said optical disk reader further comprises:

an optical pickup, said optical pickup being adapted to move from said first side of said dual sided optical disk to said second side of said dual sided optical disk to switch reading from said first side to said second side.

25. The apparatus according to claim 17, wherein said optical disk reader further comprises:

a first optical pickup to read data from said first side of said dual sided optical disk; and

a second optical pickup to read data from said second side of said dual sided optical disk.

26. The apparatus according to claim 17, wherein said memory is a dedicated memory device adapted to store data from said dual sided optical disk.

27. The apparatus according to claim 17, further comprising:

an output device connected to said controller to output said data read from said dual sided optical disk.

28. The apparatus according to claim 27, wherein said output device is a video display device.

29. An optical disk device for providing continuous uninterrupted playback of a dual sided optical disk having a first side and a second side, said device comprising:

an optical reader for reading the optical disk, the optical reader being adapted to spin the optical disk in a first direction and in a second direction;

a memory adapted to store data transferred from said dual sided optical disk; and

a controller cooperating with the optical reader and the memory to;

spin the dual sided optical disk in the first direction to enable reading data from the first side of the optical disk;

while the optical disk is spinning in the first direction, read a portion of data from the first side of the optical disk;

store said portion of data from the first side of the optical disk in a memory;

while spinning the optical disc in the first direction, read data from the first side of the optical disc not included in the stored portion of data;

read from the memory the stored portion of data after reading the data not included in the stored portion of data;

switch the optical disk from the first side to the second side concurrently with reading the stored portion of data from the memory, said switching including spinning the optical disk in a second direction; and

while spinning the optical disc in the second direction, read data from said second side of said dual sided optical disk after reading the stored portion of data from the memory.

30. The optical disk device according to claim 29, wherein said optical reader is rotatable to allow access to said second side of said dual sided optical disk.

31. The optical disk device according to claim 29, further comprising:

a transfer mechanism to flip said optical disk from said first side to said second side to enable said optical reader to read data from both sides of said disk.

32. The optical disk device according to claim 29, wherein said dual sided optical disk is a DVD.

33. A system for playing an optical disk comprising:

a processor;

a memory connected to said processor;

an output device; and

an optical disk device, said optical disk device comprising;

an optical reader capable of reading a dual sided optical disk,

processor cooperating with said optical disk reader and said memory to;

store a portion of data from a first side of said dual sided optical disk in said memory;

cause the disk reader to read data not included in said portion of data stored in said memory from said first side of said dual sided optical disk;

read said portion of data stored in said memory after reading said data not included in said portion of data stored in said memory;

switch said dual sided optical disk from said first side to a second side concurrently with said reading said portion of data stored in said memory; and

reading data from said second side of said dual sided optical disk after reading said portion of data stored in said memory.

34. The system according to claim 33, wherein said processor determines a point when reading said dual sided optical disk should be switched from said first side to said second side.

35. The system according to claim 34, wherein said portion of data stored in said memory comprises data from said determined point on said first side of said dual sided optical disk up to an end of said first side of said dual sided optical disk.

36. The system according to claim 35, wherein an amount of time required to read said portion of data stored in said memory corresponds to an amount of time required to switch reading of said dual sided optical disk from said first side to said second side.

37. The system according to claim 33, wherein said optical disk is a DVD.

38. The system according to claim 37, wherein said output device is a video display device.

39. A method for providing uninterrupted continuous playback of data read from a first and second side of a dual sided optical disk comprising:

spinning the optical disk in a first direction to enable reading data from the first side of the optical disk;

while spinning the optical disk in the first direction, reading a portion of data from the first side of the optical disk;

storing said portion of data from the first side of the optical disk in a memory;

while spinning the optical disc in the first direction, reading data from the first side of the optical disc not included in the stored portion of data;

reading from the memory the stored portion of data after reading the data not included in the stored portion of data;

switching the optical disk from the first side to the second side concurrently with reading the stored portion of data from the memory, said switching including spinning the optical disk in a second direction; and

while spinning the optical disc in the second direction, reading data from said second side of said dual sided optical disk after reading the stored portion of data from the memory.

40. The method according to claim 39, wherein the stored portion of data includes data located at an end of the first side of the optical disk.

41. The method according to claim 39, wherein said reading and storing a portion of data from the first side of the optical disk further comprises determining an amount of data to be included in said portion of data from said first side to be stored in said memory.

42. The method according to claim 41, wherein said determining includes using a processor to determine an amount of data to be included in said portion.

43. The method according to claim 41, wherein an amount of time required to read the stored portion of data from the memory corresponds to an amount of time required to switch the optical disk from the first side to the second side.

44. The method according to claim 39, wherein switching the optical disk further comprises flipping the optical disk from the first side to the second side.

45. The method according to claim 39, wherein switching the optical disk further comprises moving an optical pickup from the first side of the optical disk to the second side of the optical disk.

46. The method according to claim 39, wherein switching the optical disk further comprises using a first optical pickup to read the first side of the optical disk;

and using a second optical pickup to read the second side of the optical disk.

47. An apparatus for reading a first and second side of a dual sided optical disk comprising:

an optical disk reader capable of reading the first side of the optical disk while rotating the optical disk in a first direction around an axis and capable of reading the second side of the optical disk while rotating the optical disc in a second direction around the axis;

a memory connected to said optical disk reader; and

a controller cooperating with said optical disk reader and said memory to;

store a portion of data from the first side of the optical disk in the memory;

cause the cause the disk reader to read data not included in said portion of data stored in said memory from said first side of said dual sided optical disk;

read the portion of data stored in the memory after reading said data not included in said portion of data stored in said memory;

switch the disk from the first side to the second side concurrently with said reading said portion of data stored in said memory; and

reading data from said second side of the optical disk after reading said portion of data stored in said memory.

48. The apparatus according to claim 47, wherein the optical disk reader further comprises:

an optical pickup, the optical pickup being adapted to move from the first side of the optical disk to the second side of the optical disk to switch reading from the first side to the second side.

49. By The apparatus according to claim 47, wherein said optical disk reader further comprises a first optical pickup to read data from the first side of the optical disk and a second optical pickup to read data from the second side of the optical disk.