Head switch operations in a magnetic disk system

Details Head switch operations in a magnetic disk system Head switch operations in a magnetic disk system

1999-10-28

2000-12-19

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 7804, G11B 1512, G11B 5596

Patent

active

061634247

ABSTRACT:
A method and apparatus for performing head switch operations in a magnetic disk system having a magnetic disk device that is segmented into a plurality of cylinders, which cylinders are grouped into an inner zone, a middle zone, and an outer zone. The inner zone is near the innermost area of the magnetic disk device. The outer zone is near the outermost area of the magnetic disk device. The middle zone is in between the inner zone and the outer zone. The head switch is performed from a current head to a target head. Prior to the head switch, the system determines if the current cylinder is in either the inner zone or the outer zone. When the current cylinder is in either the inner zone or the outer zone, the system seeks the current head to the middle zone, whereupon the system performs a head switch from the current head to the target head. When the current cylinder is not found to be in either the inner zone or the outer zone, i.e. when the current cylinder is in the middle zone, then the system performs the head switch from the current head to the target head without first performing a seek. After either of the above described head switch operations, the system seeks the target head to the target cylinder, when necessary.

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