| 摘要 |
When the user instructs deletion of all program files using a remote control, a microprocessor of a set-top box repeats transmission of a deletion command with respect to all program files stored in a hard disk recorder to the hard disk recorder and deletes all program files excluding the program file subjected to lock processing among all program files stored in a hard disk recorder. Thus, the set-top box can delete all of unnecessary program files in the hard disk recorder in a short time period.
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