Briefly, an embodiment of the present invention includes a portable flash memory drive with a simplified mechanism, based upon the resilient properties of the material used to create the parts, for reliable extension and retraction of the device's interface plug. The portable flash memory drive is comprised of a metal housing (or case), a printed circuit board (PCB) assembly, PCB support, PCB assembly end cap, an upper, and lower housing, and in some embodiments a fingerprint sensor and/or key ring assembly. The press/push switch mechanism is located on either the side of the portable flash memory device, or the top; and relies upon the resilient properties of the material used to create the metal housing or end cap, to create a smooth, locking mechanism for the extension or retraction of the interface (i.e., USB or firewire) plug. The switching/locking mechanism relies upon grooves or notches within the material of the upper and/or lower housing for tracking and locking, coupled with protrusion tabs on the sliding components of the end cap or metal housing. Alternatively, in some embodiments of the present invention, a fingerprint sensor is also extended or retracted contemporaneously with the interface plug, and allows the end user to secure and unlock the data contained, in whole or in part, therein.