A mounting mechanism for a plurality of hard disk drives is provided. The mounting mechanism includes a chassis, a cage slidably received in the chassis, and two latch members pivotably attached to opposite side plates of cage. Each of the latch members includes a hook. When the latch members are pivoted to locking positions, the hooks of the latch members engage with the chassis to prevent the cage from sliding out of the chassis. When the locking members are pivoted to unlocking positions, the hooks of the latch members disengage from the chassis, therefore, the cage can be withdrawn from the chassis.