Patent ID: 11948604
Assignee: TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A magnetic disk device comprising:
a magnetic disk;
a magnetic head that accesses the magnetic disk;
a motor that moves the magnetic head;
a ramp;
a motor driver that starts a retract operation of retracting the magnetic head to the ramp by controlling a voltage applied to the motor when a voltage value of a power supply voltage falls below a first threshold; and
a processor that transmits, to the motor driver, an instruction related to applying a brake to movement of the magnetic head when the voltage value of the power supply voltage falls below a second threshold larger than the first threshold, wherein
the processor acquires a moving speed of the magnetic head toward the ramp when the voltage value of the power supply voltage falls below the second threshold, and calculates an instruction value based on at least the moving speed, and
the instruction includes the instruction value, and
the motor driver applies a voltage of a voltage value corresponding to the instruction value to the motor before the voltage value of the power supply voltage falls below the first threshold.