System for detecting a change in head-to-disk contact status in a disk drive

US7362534B1 · kind B1 · utility

Assignee

• MAXTOR CORPORATION · US

Inventors

• Erhard Schreck · San Jose, US
• Francis P. Crimi · San Jose, US
• Jingbo Yu · San Jose, US
• Michael Mallary · Sterling, US
• Scott Hughes · Cupertino, US
• Duc Bahn · San Jose, US
• Mark Heimbaugh · Pleasanton, US
• Kazuhiro Saito · Tokyo, JP
• Andrew LeFebvre · Campbell, US
• Joerg Ferber · Angerstein, DE
• Xiaoping Hu · Nanhu, CN
• Douglas J. Krajnovich · San Jose, US
• Chris Hawks · Saratoga, US
• Donald Brunnett · Pleasanton, US
• Bruce Schardt · Tracy, US

Key dates

• Filing date: Apr 7, 2005
• Grant date: Apr 22, 2008
• Expiry date: Jul 8, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/54
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A disk drive includes a rotatable storage disk, an actuator motor, a slider that magnetically interacts with the storage disk, and a drive circuitry. A portion of the slider moves between a first position wherein the slider does not contact the storage disk and a second position wherein the slider contacts the storage disk. The drive circuitry can detect when the position of the slider changes between these positions. In one embodiment, the drive circuitry monitors off-track movement of the slider to detect when the slider has moved between these positions. The drive circuitry can also current that is directed to the actuator motor that is used to compensate for off-track movement to detect when the slider moves between these positions. In yet another embodiment, the drive circuitry monitors a rotational velocity of the storage disk to detect approximately when the slider moves between these positions.