Control method for wireless communications device compatible with universal serial bus mass storage device class protocol

A control method for a wireless communications device compatible with a universal serial bus mass storage device class (UMS) protocol includes: monitoring an occurrence of a change in the file system (100, 200, 300, 400, 500, 600); and when the change in the file system (100, 200, 300, 400, 500, 600) is detected, performing at least one predetermined operation corresponding to a specific predetermined file associated with the change. For example, the change in the file system (100, 200, 300, 400, 500, 600) may be removing the specific predetermined file from the file system (100, 200, 300, 400, 500, 600) or adding the specific predetermined file to the file system (100, 200, 300, 400, 500, 600).