Patent ID: 7536502

Claim:
A controller device to be connected to a hard disk recorder capable of transmitting and receiving a control command through a serial bus comprising: an operation means for issuing instructions for various operations to the controller device and the hard disk recorder including lock processing for preventing deletion of selected program file in the program files stored in the hard disk recorder and deletion processing of all program files stored in the hard disk recorder; an interface for transmitting/receiving the control command, its response signal and stream data to/from the hard disk recorder; and a microprocessor for controlling the processing of deleting all program files in the hard disk recorder, wherein when the user instructs the deletion processing of all program files using the operation means, the microprocessor repeats transmission of a deletion command with respect to all program files stored in the hard disk recorder to the hard disk recorder and deletes all program files excluding the program file subjected to the lock processing among all program files stored in the hard disk recorder.