Data updating apparatus that performs quick restoration processing

A data updating method for updating a file in a storage medium which stores:

• (a) one or more files including the file to be updated, each file including a plurality of pieces of data, (b) a first table and a second table, both tables containing an indicator of a storage location in the storage medium for each piece of data and a sequence for the plurality of pieces of data in the file, and (c) index information a corresponding to the file, the index information associating the file name with a storage location of a predetermined piece of data in the file, the data updating method comprising the steps of:
• generating and writing temporary index information into the storage medium, the temporary index information including (i) address information indicating a storage location of the corresponding file index and (ii) new contents to which the corresponding file index is to be updated;
• updating the first table in response to completion of the writing of temporary index information into the storage medium;
• updating the second table upon the file index being updated;
• and
• deleting the temporary index information from the storage medium after the second table is updated.

A computer-readable storage medium that stores a data updating program to update a file in a storage medium which stores:

• (a) one or more files including the file to be updated, each file including a plurality of pieces of data, (b) a first table and a second table, both tables containing an indication of a storage location in the storage medium for each piece of data and a sequence for the plurality of pieces of data in the file, and (c) index information corresponding to the file, the index information associating the file name with a storage location of a predetermined piece of data in the file, the data updating program comprising the steps:
• generating and writing temporary index information into the storage medium, the temporary index information including (i) address information indicating a storage location of the corresponding file index and (ii) new contents to which the corresponding file index is to be updated;
• updating the first table in response to completion of the writing of temporary index information into the storage medium;
• updating the second table upon the file index being updated;
• and
• deleting the temporary index information from the storage medium after the second table is updated.