It will take a little longer time for the computer to identify the USB Disc according to the computer configuration and system difference and you have to wait patiently and you’d better not to press the button during such waiting time so as not to interfere the computer for identify the hardware. If the USB Disc cannot be identified over a longer time, please try to insert the disc again. If the disc cannot be identified again, then you have to confirm if the operating system, driver, USB interface and connection line are normal; when you unload the unit, you’d better to operate as required by the normal procedures so as not to cause any damage to the camera or the computer. the camera from the computer after the computer confirms such unloading.