An embodiment of a POS system according to the present invention stores log information and RAS information into a storage device ( 11 ) which stores an operating system, an application program and the like without being equipped with any non-volatile memories for storing the log information and the RAS information, wherein the log information is a record of a process, an operation and the like; and the RAS information is information pertaining to a hardware life-time. The POS device does not need to be equipped with a nonvolatile memory which is different from a storage device to store an operating system (OS), an application program and the like. Nevertheless the POS device is able to retain log information, RAS information and the like.
1. A Point Of Sales system which is not equipped with any non-volatile memories for storing log information and Reliability Availability Serviceability information, wherein
the log information is a record of a process and an operation;
the Reliability Availability Serviceability information is information pertaining to a hardware life-time which is used for estimating the hardware life-time and needs to be continuously recorded unless the hardware constituting the Point of Sale device is replaced to a new component;
the log information and the Reliability Availability Serviceability information is stored into a storage device which stores an operating system and an application program; and
the Reliability Availability Serviceability information is stored in a rearmost area of a storage area in the storage device; wherein
the rearmost area is an area which is not overwritten with the operating system and the application program.
2. The Point Of Sales system according to claim 1 , wherein
it is checked whether the Reliability Availability Serviceability information is stored in the storage device;
in the case that the Reliability Availability Serviceability information has not been stored, a Reliability Availability Serviceability information file is generated in a vacant area in the storage device in order to determine the cluster number of the destination cluster; and
it is checked whether another file occupies the storage area of the cluster number of the destination cluster;
in the case that it is determined that the another file occupies, a vacant area for destination of the another file is searched; and
after the another file is moved to the searched vacant area, the Reliability Availability Serviceability information is stored in the storage area of the cluster number of the destination cluster.
3. The Point Of Sales system according to claim 1 , wherein
the log information is stored into a rearmost area of a storage area in the storage device; wherein
the rearmost area is an area which is not overwritten with the operating system and the application program.
4. The Point Of Sales system according to claim 2 , wherein
the log information is stored into a rearmost area of a storage area in the storage device; wherein
the rearmost area is an area which is not overwritten with the operating system and the application program.