Method for controlling memory device in data management system

A data management system comprising:

• a plurality of memory devices, each having a memory area;
• and
• a controller for determining whether each of the memory devices is usable for forming a continuous memory area and forming a single continuous memory area from the memory areas of the usable memory devices by storing divisional information into the usable memory devices, wherein the divisional information indicates a location of divisional data stored in each of the usable memory devices.

A memory device having a memory area connectable to a system that forms a single continuous memory area using memory areas of a plurality of memory devices, the memory device comprising:

• a memory unit for storing management information indicating whether the memory device is usable for forming part of the continuous memory area, wherein the memory unit stores divisional information indicating a location of divisional data stored in each of the usable memory devices.