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An optical disk has grooves and lands located on the disk. A predetermined distance between the grooves and lands is defined as a predetermined track pitch. The predetermined track pitch is defined in term of a laser wavelength used during an operation. The grooves have a depth “d” in

An optical disk has grooves and lands located on the disk. A predetermined distance between the grooves and lands is defined as a predetermined track pitch. The predetermined track pitch is defined in term of a laser wavelength used during an operation. The grooves have a depth “d” in relation to the lands. The depth is related to a parameter variable “a” and a refraction index “n” of a substrate.

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1. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said

1. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation d=λ/(an) wherein said parameter “a” ranges from 2.159 to 3.778. 2. An optical disks disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an) wherein said parameter “a” ranges from 2.061 to 3.487. 3. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an) wherein said parameter “a” ranges from 2.061 to 3.022. 4. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an) wherein said parameter “a” ranges from 1.365 to 1.959. 5. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an) wherein said parameter “a” ranges from 0.716 to 1.288. 6. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined t rack pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an) wherein said wavelength λ is equal to or less than 690 nm. 7. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 0.96 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “a” and a refraction index “n” of an optical disk substrate in a relation as d=λ/(an). 8. An optical disk for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is equal to or less than 1.1 λ where λ is a laser wavelength used during the operations, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a parameter variable “n” of an optical disk substrate in a relation as d>λ/(4n). 9. The optical disk according to claim 8 wherein said wavelength λ is equal to or less than 690 nm. 10. The optical disk according to claim 8 wherein said depth “d” is selected so as to make I pp /I o ≧0.2. 11. The optical disk according to claim 8 wherein said depth “d” is selected so as to make I G /I o ≧0.5. 12. The optical disk according to claim 8 wherein said depth “d” is selected so as to make Pe/Pp≧1.2. 13. The optical disk according to claim 8 wherein said depth “d” is selected so as to make Pe/Pp≧1.3. 14. An optical dish for substantially reducing thermal cross-talk during input and output operations to and from the optical disks, comprising:grooves and lands located on the disk for storing data on both said grooves and said lands, a predetermined distance between said grooves and said lands being defined as a predetermined track pitch, wherein said predetermined track pitch is also specified by a predetermined width ratio of said grooves and said lands, said grooves having a depth “d” in relation to said lands, wherein said depth is related to a laser wavelength λ used during the operations and a refraction index “n” of an optical disk substrate in a relation as d≧λ/(4n). 15. The optical disk according to claim 14 wherein said wavelength λ is equal to or less than 690 nm. 16. The optical disk according to claim 14 wherein said predetermined width ratio is larger than 1. 17. The optical disk according to claim 14 wherein said predetermined width ratio is equal to or larger than 1.05. 18. The optical disk according to claim 14 wherein said predetermined width ratio is equal to or larger than 1.08. 19. The optical disk according to claim 14 wherein said predetermined width ratio is equal to or larger than 1.1. 20. The optical disk according to claim 14 wherein said track pitch is equal to or less than 1.1 λ. 21. The optical disk according to claim 14 wherein said track pitch is equal to or less than 0.96 λ. 22. The optical disk according to claim 14 wherein said track pitch is equal to or less then 0.81 λ. 23. The optical disk according to claim 14 wherein said depth “d” is selected so as to make Pp(groove)/Pp(land)≧80. 24. The optical disk according to claim 14 wherein said depth “d” is selected so as to make Pp(groove)/Pp(land)≧85. 25. The optical disk according to claim 7 wherein said parameter “a” ranges from 2.061 to 3.778. 26. The optical disk according to claim 7 wherein said parameter “a” ranges from 1.365 to 1.959. 27. The optical disk according to claim 7 wherein said parameter “a” ranges from 0.778 to 1.288. 28. The optical disk according to claim 7 wherein said wavelength λ is equal to or less than 690 nm.