| 摘要 |
An HDD includes a base, a swing arm having a notch at a rear end portion and mounted to the base so as to be rotatable, a VCM coil disposed on the rear end portion of the swing arm, a lower yoke and an upper yoke disposed below and above the VCM coil, at least one magnet attached to the yokes, and a latch lever levitated by the at least one magnet. The latch lever is mounted to the base so as to be rotatable, and includes a hook at one end and a counterbalance at another end. The latch lever is mounted to the base so as to be rotatable. A first magnetic retractor is installed on the counterbalance to apply torque to the latch lever. The first retract member is disposed such that the vertical component of the net magnetic force applied to the first retractor by the magnet(s) is 0 or negligible when the latch lever is located at a position at which a first air gap and a second air gap exist, respectively, immediately below and above the latch lever.
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