Claims
- 1. A recording medium comprising:
information units each of which has a data portion and a control information portion; and information unit groups each unit of which is made of predetermined number of the information units, each of the information unit groups having a set of group data identification information for discriminating data stored in each data portion as a whole; wherein the control information portion has recognition information for recognizing the information unit, and the recognition information differs by each of the information unit groups.
- 2. A recording medium according to claim 1, wherein the group data identification information is data identification information for identifying the data stored in the data portion of any one of the information units that constitute the information unit group.
- 3. A recording medium according to claim 2, wherein the group data identification information is data identification information for identifying the data stored in the data portion of a leading information unit among the information units that constituted the information unit group.
- 4. A recording medium according to claim 1, wherein the group data identification information is high order identification information common to each data identification information of the information units that constitutes the information unit group.
- 5. A recording medium according to claim 1, wherein the group data identification information is included in the control information portion of-any one of the information units that constitute the information unit group.
- 6. A recording medium according to claim 5, wherein the group data identification information is included in the control information portion of a leading information unit among the information units that constitute the information unit groups
- 7. A recording medium according to claim 1, wherein the information unit groups belong to different groups between access orbits of the information units running side by side on a disk of the recording medium.
- 8. A recording medium according to claim 1, wherein the recognition information includes information for detecting leading positions of the information unit.
- 9. A recording medium according to claim 1, wherein the recognition information includes synchronizing information to be used at the time of access to the information unit.
- 10. A recording medium according to claim 1, wherein the recognition information is repeated recursively by predetermined number of the information unit groups.
- 11. A recording medium according to claim 10, wherein predetermined number directed to information unit groups to be repeated recursively is determined basing on a positional shift expected value deviating from normal access position.
- 12. A recording medium according to claim 11, wherein the recognition information is discriminated uniformly for the information unit groups included within a region of the positional shift expected value.
- 13. A recording medium according to claim 1, the recording medium is an optical disk.
- 14. A recording medium access device for conducting access operation to a recording medium of claim 1, the recording medium access device comprising:
recognition information detector for detecting the recognition information included in the information unit group subject to access; expected value generator for generating a recognition information expected value in order wherein the recognition information detected at first is defined as an initial value; and comparator for comparing a detection result obtained by the recognition detector with the recognition information expected value obtained by the expected value generator.
- 15. A recording medium access device according to claim 14 further comprising a measuring unit for measuring timing to scan the information unit group for access operation, wherein the expected value generator changes the recognition information expected value in order basing on a measurement result obtained by the measuring unit.
- 16. A recording medium access device according to claim 15, wherein the measuring unit measures in accordance with a reference synchronizing signal.
- 17. A recording medium access device according to claim 14 further comprising:
a recorder for accumulating and storing relation of the group data identification information and the recognition information, and discriminator for discriminating the information unit group including recognition information linked together by the recorder for access operation, wherein the group data identification information designated among the information unit group discriminated by the discriminator is detected.
- 18. Recording medium access method for conducting access operation to a recording medium of claim 1, the recording access method comprising the steps of:
detecting the recognition information included in the information unit group subject to access; generating a recognition information expected value in order wherein the recognition information detected at first is defined as an initial value; and comparing the recognition information to be detected with the recognition information expected value to be generated.
- 19. Recording medium access method according to claim 18 further comprising the steps of:
measuring timing to scan the information unit group at for access operation; and changing the recognition information expected value in order basing on timing measured.
- 20. Recording medium access method according to claim 18, wherein relation of the group data identification information and the recognition information is previously grasped and the recording medium access method further comprises the steps of:
discriminating the information unit group including recognition information linked together for access operation; and detecting the group data identification information designated among the information unit group to be selected.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation application based upon and claims the benefit of the prior PCT International Patent Application No. PCT/JP01/09306 filed on Oct. 23, 2001, the entire contents of which are incorporated herein by reference.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/JP01/09306 |
Oct 2001 |
US |
Child |
10819263 |
Apr 2004 |
US |