Load-unload investigations on a rotary actuator disk drive

Levi, P.G.; Talke, Frank E.

doi:10.1109/intmag.1992.696502

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1993

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Cited by 7 publications

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Ramp loading "sweet spots"

Yaeger¹,

Hiller²

2002

Microsystem Technologies

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The range of PSA/RSA (slider pitch/roll static attitude respectively) devoid of head-disk contact during ramp loading is called ''sweet-spot''. Its extent was measured for different air-bearing designs and loading variables. The sweet spot boundaries are determined both by the air bearing and ''body-effects'' invariant of air bearing design. In the latter case, the air-bearing genesis occurs sufficiently far from the disk where detailed ABS differences have little relative transient effect. The available sweet spot is roughly ±1°which is within drive design capability, but requires attention to details. Measuring head/disk contact severity over the sweet spot indicates ranges of PSA/RSA to be stringently avoided (e.g. negative pitch) and those more tolerant of head/disk contact. The sweet spot extent is confirmed with disk damage at the boundaries for 100,000 cycles. A key parameter is loading velocity. Optimum sweet spot occurs with a vertical loading velocity of about 1 inch/sec and diminishes to near-zero at 4 inch/sec. The test technique is described in detail. Sweet spot knowledge in used to predict head-disk contact reliability.

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