b plug 30 in fig5 in the fifth application of the plug 50 in the invention the metal connection terminals 52 can be changed into i e elastic plates so as to allow a connector to be inserted into the connector can be the usb plug 30 10 100 in the computer likewise the plug can also be connected to the usb receptacle or even a reversed arrangement of the plug 50 suitable for use in the actual design in application 6 it is related to a design of the connectors for the peripheral equipment of the computer and an information storage device the computer system is for example a notebook computer and the information storage device for example is a pda or storage device for the storage device of the digital camera it is for example a cf card after the cf card is released out from the peripheral device of computer conventionally it needs a reading apparatus to read the information the information in the cf card can be input to the usb port of the computer via the reading device with the usb connector the portable information storage device inside the peripheral device of computer can be a silicon disk or memory device implemented with the conventional plug of usb series a 10 usb series mini a 100 or series mini b 30 the silicon disk or memory device can also be implemented with a plug of the invention which can be connected to the receptacle or the plug of usb series a usb series mini a series mini b series mini ab the silicon disk or memory device can be disposed inside the peripheral device of computer the peripheral device of computer is implemented.