Patent ID: 8380764

Claim:
A file control system, comprising: a client computer; a storage medium for storing client data; and a main computer including: a file system for managing reading and writing of data between the client computer and the storage medium, a control circuit for controlling the file system, and a memory circuit for storing management information of the file system, wherein the memory circuit stores setting information having a plurality of entries each including: an additional function of the file system, a condition for operating the additional function, a prescribed storage capacity allocated from the storage medium, and a priority of the additional function, wherein, upon expanding the file system based on the management information, the control circuit is configured to determine a status of fulfillment of the condition in the expanded file system, and to output warning information if the determination result denies fulfillment of the condition, and wherein the control circuit is configured to determine a status of fulfillment of the condition for each of the plurality of entries, and to allocate the storage area to the additional function in each of the plurality of entries whose fulfillment of the condition was denied in descending order of the priority of the additional functions.