Patent ID: 7716746
Filing Date: 2010-05-11
Classification: G06F

Abstract:
1. A data storage device performing input/output of classified data in accordance with predetermined input/output procedures for protection of said classified data, and storing said classified data, comprising: an interface portion externally exchanging data; a first storage portion storing said classified data; and a second storage portion storing log information related to the input/output of said classified data according to said predetermined input/output procedures and an address representing a storage position of said classified data to be input/output in said first storage portion, wherein said log information includes: an identification code identifying said classified data to be input/output, and a first status information representing a state of storage of said classified data to be input/output in said first storage portion, said data storage device further comprising a control portion controlling the input/output of said classified data, wherein said first storage portion further stores a flag, corresponding to said classified data, indicating whether said classified data can be used or not, and said control portion determines the state of storage of said classified data to be input/output in said first storage portion according to comparison of an identification code of classified data stored at a storage position in said first storage portion specified by said address with an identification code stored in said second storage portion, and a state of said flag corresponding to said classified data to be input/output.