An electrical connection interface is disclosed to include a holder frame mounted in the case of a host system, a first electrical connector mounted inside the holder frame, and having a first connecting terminal, a second connecting terminal formed integral with one side of the first connecting terminal, a signal cable connecting the first connecting terminal to the signal connector of the host system, and a power cable connecting the second connecting terminal to the power connector of the host system, and a second electrical connector installed in a mobile data storage device for connecting to the first electrical connector to electrically connect the mobile data storage device to the host system upon insertion of the mobile data storage device into the holder frame inside the case of the host system.