Data processing apparatus and access control method
AssigneeFujitsu Limited
InventorsKatsumi Shirai, Ichiro Anzai
Life of this patent
Estimating the term…
Abstract
An accessible count information which is the number of accessible times for recording medium is recorded on an additional recording dedicated area in the recording medium. Each time the recording medium is accessed, the accessible count information is subtracted and the value of remaining accessible count information is recorded in a non-recorded portion of the dedicated area. In this case, the access to the recording medium is controlled based on the minimum value of the accessible count information recorded in the dedicated area.
Claims18
A data processing apparatus for accessing a recording medium for reading and writing of data comprising:
- a setting unit for setting a predetermined area on said recording medium as a dedicated area for additional recording, in which the rewriting of recorded data is inhibited but in which the writing of data in a non-recorded portion is permitted;
- a recording unit for recording initial information regarding the number of accessible times to said recording medium in said dedicated area, and count information regarding the number of access times to said recording medium in said non-recorded portion of said dedicated area each time accessing to said recording medium occurs;
- and
- an access controller for controlling access to said recording medium based on access control information including said initial information recorded in said dedicated area and said count information recorded in said non-recorded portion of said dedicated area.
An access control method for accessing a recording medium for reading and writing of data comprising the steps of:
- recording an initial information regarding the number of accessible times to said recording medium in a dedicated area for additional recording on said recording medium, in which the rewriting of recorded data is inhibited but in which the writing of data in a non-recorded portion is permitted, and a count information regarding the number of access times to said recording medium in said non-recorded portion of said dedicated area each time accessing to said recording medium;
- and
- controlling access to said recording medium based on access control information including said initial information recorded in said dedicated area and said count information recorded in said non-recorded portion of said dedicated area.
A recording medium comprising:
- a data area;
- and
- an access control area in which access control information used for a controlling access to said data area is set,
- wherein said access control area is a dedicated area for additional recording, in which the rewriting of recorded data is inhibited but in which the writing of data in a non-recorded portion is permitted;
- wherein said access control information includes an initial information and a count information, said initial information regarding the number of accessible times to said recording medium being recorded in said dedicated area, and said count information regarding the number of access times to said recording medium being recorded in said non-recorded portion of said dedicated area each time accessing to said recording medium.
Dependencies are inferred from the claim text.