초록 ▼

A servo system in a disk drive in a mobile device is responsive to an environment signal from the mobile device to generate a first current profile to a head actuator when the mobile device is docked and to generate a second current profile to the head actuator when the mobile device is mobile. The

A servo system in a disk drive in a mobile device is responsive to an environment signal from the mobile device to generate a first current profile to a head actuator when the mobile device is docked and to generate a second current profile to the head actuator when the mobile device is mobile. The second current profile requires less power than the first current profile, thus reducing current drain on a battery in the mobile device.

대표청구항 ▼

A servo system in a disk drive in a mobile device is responsive to an environment signal from the mobile device to generate a first current profile to a head actuator when the mobile device is docked and to generate a second current profile to the head actuator when the mobile device is mobile. The

A servo system in a disk drive in a mobile device is responsive to an environment signal from the mobile device to generate a first current profile to a head actuator when the mobile device is docked and to generate a second current profile to the head actuator when the mobile device is mobile. The second current profile requires less power than the first current profile, thus reducing current drain on a battery in the mobile device. includes a leading edge which is detected at the moment emitted light from said light-emitting element is no longer received by said light sensing element during an operating mode. 11. The method of claim 10, wherein said apparatus has a power-save mode, and said light-emitting element is driven in said pulsed manner in said power-save mode. 12. The method of claim 10, wherein said apparatus has a power-off mode, and said light-emitting element is driven in said pulsed manner in said power-off mode. 13. The method of claim 10, wherein said object is a magnetic recording medium, said apparatus has a stop mode in which said magnetic recording medium does not move, and said light-emitting element is driven in said pulsed manner in said stop mode. 14. The method of claim 10, wherein said object is a magnetic tape, said apparatus has a fast-forward mode and a rewind mode, and said light-emitting element is driven continuously in said fast-forward mode and said rewind mode. 15. The method of claim 10, further comprising the steps of: supplying a pulse-width modulated signal to a switching element coupled to said light-emitting element; and setting a duty cycle of said pulse-width modulated signal to one hundred percent to carry out said step of driving said light-emitting element continuously, and to a lower duty cycle to carry out said step of driving said light-emitting element in said pulsed manner. 16. The method of claim 10, further comprising the step of charging a capacitor by said electrical signal while said light is received, thereby holding said electrical signal continuously above a predetermined threshold voltage level while said light is received, even when said light-emitting element is driven in said pulsed manner. 17. The method of claim 16, further comprising the step of discharging said capacitor through a resistor while said light is not received, said step of discharging proceeding at a slower rate than said step of charging. 18. The method of claim 10, wherein the light-sensing element is aligned with said light-emitting element and said object. 19. An apparatus for determining whether a data medium is present for performing an operation in one of a plurality of operating modes, comprising: a light emitter that emits a continuous beam of light in a first operating mode and a pulsed beam of light in a second operating mode; a switching element that supplies power to said light emitter; a sensor slit which opens to emit light from said light emitter toward a light sensor when a data medium is present, the light emitter, data medium, sensor slit and light sensor being linearly aligned and said data medium and sensor slit being located between said light emitter and said light sensor. 1-US1, filed concurrently, entitled "Storage Disk having Surface Profile Variations Patterned to Reduce Airbearing Modulation", which is assigned to the assignee of the instant application.