Method and system for expanding the memory capacity of devices that use flash memory cards. In one aspect, a memory card expander assembly includes an adaptor shaped to be connected to a memory card slot of a host device, and a receptacle assembly in communication with the adaptor and operative to be attached to the host device. The receptacle assembly includes an expanded memory card slot operative to connect to a memory card such that the host device can communicate with the connected memory card when the adaptor is connected to the memory card slot.