Patent ID: 9466330
Filing Date: 2016-10-11
CPC Classification: G11B

Claim Text:
1. A correction value calculating method comprising: obtaining a first distance that is a distance actually traveled by a head on a ramp member while the head is unloaded; obtaining a first torque value exerted on a coil when the head is unloaded, the coil being used to drive the head, the first torque value being obtained while the head moves on the ramp member; generating a first correction value used to correct the first torque value; actually unloading the head with the first correction value; obtaining a second torque value exerted on the coil when the head is actually unloaded, the second torque value being obtained while the head moves on the ramp member; calculating a second distance based on the second torque value, the second distance being a distance traveled by the head; and calculating a second correction value based on the first correction value, and a ratio of the first distance to the second distance, the second correction value being used to correct the second torque value.