Method for controlling the velocity of an actuator arm in a hard disk drive
US6683743B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2001 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Feb 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5521
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for controlling the velocity of an actuator arm in a hard disk drive includes moving the actuator arm to an inner limit or outer limit of motion. Then the power to the actuator coil, which drives the actuator arm, is reduced to zero and the actuator arm is released. Bends in the flexible cable connected to the actuator arm can cause the actuator arm to move toward the outer limit of motion. As the actuator arm moves due to the flexible cable, the velocity contribution of the flexible cable is measured and stored. Thereafter, the velocity of the actuator arm, during emergency power shut off, normal unload of the disk drive, or normal load of the disk drive, is decreased or increased by an amount equal to the cable-induced velocity to compensate for the velocity contribution of the flexible cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.