Data storage apparatus and method for table management

A method for table management for use in a data storage apparatus having a first management table having address data representing a storage position of data stored in a flash memory, and a second management table having address data representing valid data included in the data stored in the flash memory, the method comprising:

• acquiring a number of valid data from a counter table, in units of addresses;
• comparing the number of data valid in units of addresses acquired by referring to the first management table with a count value acquired in units of addresses from the counter table:
• and
• performing a matching check process for confirming matching between the first and second management tables from a result of the comparison.

A data storage control apparatus comprising:

• a first memory configured to store a first management table having address data representing a storage position of data stored in a flash memory;
• a second memory configured to stored a second management table having address data representing valid data included in the data stored in the flash memory;
• a counter table memory configured to store a counter table showing the count value of valid data in units of addresses;
• and
• a controller configured to refer to the first management table, to compare the number of data valid in units of addresses acquired by referring to the first management table, and to perform a matching check process for confirming matching between the first and second management tables from a result of the comparison.