A system and a method for recognizing removable devices of a computer device, and displaying a dialog box to prompt whether a removable storage device needs to be renamed and if so to receive input data accordingly from a user, if a USB port has been newly connected to the removable storage device. The recognition method further includes acquiring a unique port number of the USB port actually connected to the removable storage device, and acquiring a device name of a system disk name of the removable storage device originally allocated by the computer device, if the removable storage device needs to be renamed. The recognition method further may utilize the unique port number of the USB port as the new device name of the removable storage device in renaming it.