Abstract: A flexible disk drive includes a reset lever which holds an upper head in an upper or open position in an unloaded condition of a magnetic head and, interlocked with a closing motion of a door, moves downward together with the upper head, and a head load arm rotatable in response to downward movement of the reset lever to allow the upper head to make contact with a floppy disk. Connected to the head load arm is toggle device whose biasing direction is inverted by the rotation of the arm to bias the arm toward the disk. A hub adapted to rotate a floppy disk is located to face a collet which is adapted to align the center of the disk with that of the hub. When the door is closed while a floppy disk is not inserted, the collet is brought into engagement with the hub. At this instant, a gap is defined between the upper head and a lower head by a clamp lock to prevent the two heads from making contact with each other.