Patent ID: 7566248

Claim:
An expandable function data storage device, connected to a computer, comprising: a first main body comprising a memory circuit unit and a power supply unit connecting with each other, its first end being exposed outside and provided with a first signal transmission port connected to said memory circuit unit, so as to be connected to said computer and transmit data to each other, and store said data into said memory circuit unit, and the second end of said first main body being provided with a second signal transmission port electrically connected to said memory circuit unit; and a second main body, provided with a reception space, in a relationship of a detached and sleeved manner with said first end of said first main body, so as to shield and protect said first signal transmission port, an application circuit unit being provided in said second main body and connected to a third signal transmission port provided in said reception space, wherein said second main body can be selectively sleeved on and connected to said second end of said first main body, so that said second signal transmission port is connected to said third signal transmission port, such that said memory circuit unit is electrically connected to said application circuit unit.