Abstract: The present application relates to an external USB (UNIVERSAL SERIAL BUS) adapter. The external USB adapter is an interface-converting apparatus, thereby externally installing a storage medium device or other peripheral components on a personal computer via a USB port of the personal computer. The external USB adapter comprises: an upper cover; a lower cover; a printed circuit board located between the upper cover and the lower cover; a USB-end socket connected to the printed circuit board; an external-device-end socket connected to the printed circuit board; and at least one external fixing element. The printed circuit board further comprises a drive IC.