Proximity communication system, proximity communication method, data managing apparatus and data management method, storage medium, and computer program

A proximity communication method of rewriting data in response to a request from an external device in the proximity thereof,

• a memory area comprises one or more data blocks for rewriting the data in response to the request from the external device, and control information provided for each of the data blocks, the method comprising:
• performing a rewrite operation in a single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is equal to or less than an allowable rewritten data size, and
• performing a rewrite operation in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction in into an end control information even if the rewrite operation is interrupted.

A data management method of managing data in a system in which data is rewritten in a single transaction comprising:

• providing a memory area with one or more data blocks for writing a user data and control information for managing each data block,
• performing a rewrite operation in a single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is eaual to or less than an allowable rewritten data size, and
• performing a rewrite operation in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction into an end control information even if the rewrite operation is interrupted.

A storage medium having stored therein computer software, in a computer-readable format, described so as to execute a data rewrite process on a computer system in response to a request from an external device in the proximity thereof, characterized in that

• a memory area comprises one or more data blocks for rewriting the data in response to the request from the external device, and control information provided for each of the data blocks,
• a rewrite operation is performed in single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is equal to or less than an allowable rewritten data size, and
• a rewrite operation is performed in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction into an end control information even if the rewrite operation is interrupted.

A storage medium having stored therein computer software, in a computer-readable format, described so as to execute, on a computer system, a data management method on a system in which single transaction is guaranteed, the method comprising:

• providing a memory area of the system with one or more data blocks for writing a user data thereto and control information for managing each data block,
• performing a rewrite operation in a single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is equal to or less than an allowable rewritten data size, and
• performing a rewrite operation in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction into an end control information even if the rewrite operation is interrupted.

A computer-readable medium having a computer program for executing, on a computer system, a process for rewriting data in a memory area in response to a request from an external device in the proximity thereof,

• the memory area comprising one or more data blocks for rewriting the data in response to the request from the external device, and control information provided for each of the data blocks, the process comprising the steps of:
• performing a rewrite operation is performed in single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is eaual to or less than an allowable rewritten data size, and
• performing a rewrite operation is performed in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction into an end control information even if the rewrite operation is interrupted.

A computer-readable medium having a computer program for executing, on a computer system, a data management process in a system in which rewriting data in a memory area in a single transaction is guaranteed, comprising:

• performing a rewrite operation in a single transaction by performing the rewrite operation en bloc when a sum of control information relating to rewriting a data block is equal to or less than an allowable rewritten data size, and
• performing a rewrite operation in a single transaction by dividing the control information, in a linked order, into a plurality of groups, each of which can be rewritten in a single transaction, when the sum of the control information relating to rewriting the data block exceeds the allowable rewritten data size, and writing information that enables continuing performance of the following transaction into an end control information even if the rewrite operation is interrupted
• rewriting the user data of the data block and rewriting the control information by means of a transaction that guarantees rewriting operation associated with the rewriting of the user data.