head-slap · unknown · also head-slap

Head slap

Head slap is a head-disk contact mechanism in which an HDD slider separates from the disk and then snaps back into it.

Related Observatory article: Head slap on hesela.com

Li and Bogy identify this mechanism in their coupled structural and air-bearing simulation, distinct from long-pulse loading that overcomes a still-positive bearing force [1]. Residual vibration can cause contact after the pulse ends. It is a mechanism, not a synonym for every head crash, a SMART counter or a universal shock threshold.

Relations

related

head-disk-interface, flying-height

Citations

1. Li and Bogy: Operational Shock Failure Mechanisms in Hard Disk Drives, CML report 13009, sections 4.1-4.2 and 5 (accessed 2026-10-15)
2. Hesela: HDD mechanical faults, evidence and diagnostic limits (accessed 2026-10-15)

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