Abstract: A charger includes a battery module, a boosting and charging circuit, a low voltage boosting circuit, and a charging interface. The battery module provides an operating voltage for the boosting and charging circuit and the low voltage boosting circuit. When the operating voltage is greater than a reference voltage of the boosting and charging circuit, the boosting and charging circuit module works and outputs a charging voltage to the charging interface. When the operating voltage is smaller than the reference voltage of the boosting and charging circuit but greater than a starting voltage of the low voltage boosting circuit, the low voltage boosting circuit works and boosts the operating voltage to the boosting and charging circuit, and then the boosting and charging circuit module works and outputs the charging voltage to the charging interface for the mobile phone.

Abstract: A method for testing a burner includes the steps of: providing a rewriter (RW) disk (4) in good burning condition, and inserting the RW disk into a test burner (3) connected to a computer (1); selecting a burner type for the burner; designating a source file to be burned, and setting a counter J=0, a loop time N and a maximum time of fail test M; erasing all data on the RW disk; burning the source file onto the RW disk; determining whether the source file is successfully burned to the RW disk; executing J=J+1 if the source file is successfully burned to the RW disk; repeating the erasing step, the burning step and the determining step, and counting a time of successfully burned process by the counter J, until J=N?M+1 which denotes that the burner is in good burning condition. A related method for testing a RW disk is also provided.

Abstract: An exemplary dual-layered optical disc includes a transparent cover layer, a first recording layer, a space layer, a second recording layer, a reflective film, and a substrate, all of which are deposited one upon the other in this order. The first recording layer includes a re-recordable material. The second record layer includes a write-once material. Therefore, the dual-layered optical disc supplies two different types of recording layers.

Abstract: A charger includes a battery module, a boosting and charging circuit, a low voltage boosting circuit, and a charging interface. The battery module provides an operating voltage for the boosting and charging circuit and the low voltage boosting circuit. When the operating voltage is greater than a reference voltage of the boosting and charging circuit, the boosting and charging circuit module works and outputs a charging voltage to the charging interface. When the operating voltage is smaller than the reference voltage of the boosting and charging circuit but greater than a starting voltage of the low voltage boosting circuit, the low voltage boosting circuit works and boosts the operating voltage to the boosting and charging circuit, and then the boosting and charging circuit module works and outputs the charging voltage to the charging interface for the mobile phone.

Abstract: A method for testing a burner includes the steps of: providing a rewriter (RW) disk (4) in good burning condition, and inserting the RW disk into a test burner (3) connected to a computer (1); selecting a burner type for the burner; designating a source file to be burned, and setting a counter J=0, a loop time N and a maximum time of fail test M; erasing all data on the RW disk; burning the source file onto the RW disk; determining whether the source file is successfully burned to the RW disk; executing J=J+1 if the source file is successfully burned to the RW disk; repeating the erasing step, the burning step and the determining step, and counting a time of successfully burned process by the counter J, until J=N?M+1 which denotes that the burner is in good burning condition. A related method for testing a RW disk is also provided.