A hard disk drive (1) includes a baseplate (10), a disk stack (90), a head stack (50), a spindle motor (80) and a connector assembly. The connector assembly includes a connector (100) and a circuit board (140). The connector includes a insulative base (110) and a plurality of contacts (124, 126, 128) extending from the insulative base and being soldered to the circuit board at one end thereof. The baseplate receiving the circuit board and the connector, includes a bottom wall (36), two side walls (39) and two separating walls (34) extending perpendicularly from the bottom wall. The insulative base of the connector, the bottom wall, the two side walls and the two separating walls corporately form three contacts receiving housing.