Claims
- 1. An apparent data erasure method related to the protection of written data in an optical disk by a first user from unauthorized accessing or copying by a second user, comprising the steps of:
dividing the boot region of an optical disk into a first sub-boot region and a second sub-boot region; storing up the content of a first data content table in the first sub-boot region; storing up the actual data in the data-recording region of the optical disk; and storing up the content of a second data content table in the second sub-boot region; wherein the first data content table holds all related data for accessing the actual data while the second data content table holds only a portion of the information for accessing a portion of the actual data.
- 2. The method of claim 1, wherein actual data includes document data, image data and photographic data.
- 3. The method of claim 1, wherein the related data includes a plurality of data addresses, a plurality of data lengths and a plurality of data attributes.
- 4. An apparent data erasure method related to the capability of a second user to access only the non-hidden data in an optical disk, comprising the steps of:
removing the data corresponding to a second data content table from the data corresponding to a first data content table, wherein content of the first data content table is stored in a first sub-boot region of the optical disk while content of the second data content table is stored in a second sub-boot region of the optical disk; displaying of the remaining data in a data-recording region that corresponds to the first data content table; and permitting a second user to access data in the displayable data recording-region.
- 5. The method of claim 4, wherein the actual data includes document data, image data and photographic data.
- 6. The method of claim 4, wherein before the step of permitting the second user to access data in the optical disk, further includes the following treatments:
finding the authority level of the second user;
permitting the second user to access all the data within the optical disk if the second user has appropriate authority; and displaying only a portion of the data in the optical disk if the second user does not have appropriate authority to read the entire disk.
- 7. The method of claim 4, wherein the first data content table records all the related data for accessing any data within the optical disk.
- 8. The method of claim 4, wherein the second data content table records a portion of the related data for accessing a portion of the data in the optical disk.
- 9. The method of claim 7 or claim 8, wherein the related data includes a plurality of data addresses, a plurality of data lengths and a plurality of data attributes.
- 10. An apparent data erasure method related to the protection of written data in an optical disk by a first user from unauthorized accessing or copying by a second user, comprising the steps of:
dividing the boot region of an optical disk into a first sub-boot region and a second sub-boot region; storing up the content of a first data content table in the first sub-boot region; storing up the actual data in the data-recording region of the optical disk; storing up the content of a second data content table in the second sub-boot region; removing the content in the second data content table from the content in the first data content table; displaying the content of the first data content table after removing the content in the second data content table; searching out the data in the data-recording region that corresponds to the remaining content in the first data content table; and permitting the second user to access the data in the data-recording region that corresponds to the remaining content in the first data content table.
- 11. The method of claim 10, wherein the actual data includes document data, image data and photographic data.
- 12. The method of claim 10, wherein before the step of permitting the second user to access data in the optical disk, further includes the following treatments:
finding the authority level of the second user;
permitting the second user to access all the data within the optical disk if the second user has appropriate authority; and displaying only a portion of the data in the optical disk if the second user does not have appropriate authority to read the entire disk.
- 13. The method of claim 10, wherein the first data content table records all the related data for accessing any data within the optical disk.
- 14. The method of claim 10, wherein the second data content table records a portion of the related data for accessing a portion of the data in the optical disk.
- 15. The method of claim 13 or claim 14, wherein the related data includes a plurality of data addresses, a plurality of data lengths and a plurality of data attributes.
Priority Claims (1)
Number |
Date |
Country |
Kind |
89124360 |
Nov 2000 |
TW |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of Taiwan application serial no. 89124360, filed Nov. 17, 2000.