Patent ID: 7610442

Claim:
A dual journaling storing method for storing data in a storage medium, characterized in that data are stored from start and end locations of the storage medium toward a central location, wherein when two types of the data whose kind and characteristics are different are stored in the storage medium, the two types of data are separately stored as a front journaling and a rear journaling, respectively, wherein when a head of the front journaling and a head of the rear journaling meet each other at a first location, a central location is set at the first location and the head of the front journaling is returned to the start location and the head of the rear journaling is returned to the end location, wherein the central location moves toward the other party's journaling if the head of the front journaling or the head of the rear journaling arrives again at the central location and the other head is not located at the central location, and wherein the head is indicative of a location for storing data.