Data conversion method on storage medium, apparatus and program

Abstract

In a data conversion auxiliary module which is at a higher level than a file system in a disk management hierarchy, data stored in a storage medium, which becomes an object, is successively accessed. Then, a data conversion module captures a sector-unit access request to a device driver from the file system, converts data of a sector which is returned from the device driver, and writes the conversion data in the sector. Thereby, data conversion can be executed on a specific region of the storage medium, which is associated with the data in the storage medium.

1 . An information processing apparatus comprising:
 data access means, provided at a higher level than a file system in a disk management hierarchy, for executing data read access for reading out data stored in a storage medium;   capturing means, provided at a lower level than the file system, for capturing data of a sector, which is read out by a sector-unit data read access request to a device driver, the data read access request being generated from the file system by the data read access;   data conversion means for encrypting the captured data of the sector; and   data write means for writing the encrypted data of the sector in the sector of the encrypted data.   
     
     
         2 . The information processing apparatus according to  claim 1 , wherein the data access means executes data access to only data in the storage medium, which meets a designated condition. 
     
     
         3 . The information processing apparatus according to  claim 1 , wherein the data conversion means includes means for decrypting the encrypted data of the sector. 
     
     
         4 . The information processing apparatus according to  claim 1 , further comprising setting means for setting a degree of operation priority of a process by the data access means in an OS (operating system) of the information processing apparatus. 
     
     
         5 . The information processing apparatus according to  claim 1 , further comprising a data conversion information table which stores, in a correlated fashion, a sector number of the storage medium, a data conversion object flag which indicates whether a sector is an object of data conversion or not, and a data conversion flag which indicates whether data is encrypted or not,
 wherein the capturing means sets the data conversion object flag at a value which indicates that the sector is the object of data conversion, in a case where the sector that is the object of data conversion is captured from the file system, and   the write means sets the data conversion flag of the data conversion information table at a value which indicates that the data is encrypted, in a case where the encrypted data of the sector has been written.   
     
     
         6 . A data conversion method in an information processing apparatus, comprising the steps of:
 executing, at a higher level than a file system in a disk management hierarchy, data read access for reading out data stored in a storage medium;   capturing data of a sector, which is read out by a sector-unit data read access request to a device driver, the data read access request being generated from the file system by the data read access;   encrypting the captured data of the sector; and   writing the encrypted data of the sector in the sector of the encrypted data.   
     
     
         7 . The data conversion method according to  claim 6 , wherein the data access is executed to only data in the storage medium, which meets a designated condition. 
     
     
         8 . The data conversion method according to  claim 6 , further comprising a step of decrypting the encrypted data of the sector. 
     
     
         9 . The data conversion method according to  claim 6 , further comprising a step of setting a degree of operation priority of a process by the data access step in an OS (operating system) of the information processing apparatus. 
     
     
         10 . A program for use in an information processing apparatus which encrypts data stored in a storage medium, the program causing the information processing apparatus to:
 execute, at a higher level than a file system in a disk management hierarchy, data read access for reading out data stored in the storage medium;   capture data of a sector, which is read out by a sector-unit data read access request to a device driver, the data read access request being generated from the file system by the data read access;   encrypt the captured data of the sector; and   write the encrypted data of the sector in the sector of the encrypted data.