A disk drive includes a latch mechanism. A lever and a weight are supported on a first shaft. The lever defines first and second operating spots distanced from the first shaft by first and second distances, respectively. The weight is distanced from the first shaft by a third distance shorter than the first and second distances. A swinging member is supported on a second shaft at a position defined between the first and second operating spots within a space between the lever and the cover of the enclosure. Even if impact acts on the disk drive, the lever is received on the swinging member between the first and second operating spots. The lever is prevented from moving in the axial direction of the first shaft. Contact is reliably prevented between the lever and the cover. Generation of noise can thus be avoided.