Patent ID: 8296322
Filing Date: 2012-10-23
Classification: G06F

Abstract:
1. A user terminal device constituting part of a thin client system that transfers and stores data to a file server, comprising: a secondary storage device; file access control means that determines the kind of an I/O request issued to the secondary storage device and determines, if the I/O request is a write request, if an application that is the source of the I/O request is permitted to write data to the secondary storage device; write control means that redirects and stores to a cache memory data that has been requested to be written; upload data management means that, if the application that is the source of the I/O request is not permitted to write data to the secondary storage device, manages and uploads to the file server the data that has been requested to be written; and automatic backup means that reads the data managed by the upload data management means from the cache memory and uploads the data to the file server at a time of shutting down the user terminal device, wherein: the write control means includes first redirecting means that processes a write request and a read request, and second redirecting means that processes only a write request, each of the first redirecting means and the second redirecting means, if the file access control means has determined that the application that is the source of the write request is permitted to write data to the secondary storage device, stores into the cache memory the data that has been requested to be written, and the second redirecting means writes the data stored in the cache memory to the secondary storage device at the time of shutting down the user terminal device.