A multi-layer USB drive for storing data in a memory has at least two printed circuit board assemblies, each one including a memory for storing data and a control microprocessor controlling the flow of data to and from the memory. The circuit board assemblies are operatively connected to one another in a serial manner for exchange of data between adjacent assemblies upon access by a user and wherein at least one of the control microprocessors is security enabled requiring a user defined security input for accessing the memory of the printed circuit board assembly of that security enabled control microprocessor. A USB connector is for connecting to a USB slot of a device and the USB connector is operatively connected to only one of the printed circuit board assemblies. A USB hub is provided on at least one of the assemblies for recognizing the circuit board assemblies of the USB drive. An opaque housing completely encloses the circuit board assemblies preventing at least the printed circuit board assembly or assemblies other than the one connected to the USB connector from being viewed.