| 摘要 |
A semiconductor memory device according to the present invention comprises a housing including a card bus connector for connection to a host device and having a PC card shape having a thickness of 5.0 mm, four SD memory cards housed in the housing and a control circuit for controlling transmission/reception of a signal between the card bus connector and the respective SD memory cards. The semiconductor memory device is suitably used as a recording medium of a host device for which a higher data transfer rate and a larger memory capacity are demanded. Further, a semiconductor memory device, which is attachable and detachable relative to the host device and thereby portable, and relatively inexpensively obtainable, can be provided, and is directly insertable into a laptop personal computer to be used.
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