A flash drive includes a storage module, a switching module, and a transforming mechanism. The storage module has a storage unit and a first interface electrically connected to each other. The switching module has a second interface and a third interface which are in different types but are electrically connected to each other, and the first interface corresponds to the second interface. The transforming mechanism is located at a first position or a second position relative to the storage module, and the switching module is located in the transforming mechanism. When the transforming mechanism is located at the first position, the first interface is electrically connected to the second interface, so that the storage unit is electrically connected to a host through the third interface. When the transforming mechanism is located at the second position, the first interface of the storage unit is electrically connected to the host.