Disk drive servo control techniques to preserve PES continuity

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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Reexamination Certificate

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07616399

ABSTRACT:
A disk drive comprising a moveable head, a disk, and a servo controller that implements servo control techniques to preserve PES continuity during track following operations is disclosed. The disk includes a plurality of tracks in which a substantial majority of the tracks include a plurality of servo sectors having a plurality of servo bursts that are utilized in track following operations. The servo controller controls track following operations with the moveable head and implements operations to preserve PES continuity during track following. These operations include: dividing tracks of the disk into a plurality of zones wherein each zone includes zone boundaries; and utilizing a PES equation for each zone to generate a PES value based upon read servo bursts wherein each zone PES equation includes a normalizing factor to account for boundary conditions associated with zone boundaries to preserve PES value continuity between zones.

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Thesis of Alexei Sacks PhD, Position Error Signal Generation in Magnetic Disk Drives, Carnegie-Mellon University.
Dennis Cahalan, Kiran Chopra, Effects of MR Head Track Profile Characteristics on Servo Performance, IEEE Transactions on Magnetics, vol. 30 No. 6, Nov. 1994.

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