Abstract
The Head Crash process during Contact Start and Stop (CS/S) operations was investigated to increase the recording density of disk storages by reducing the head flying height reliably. Friction force between head and disk, acoustic emission (AE) signal and read-out signal from head were measured during CS/S operations. Sliding surfaces were also observed. Coated disks without lubricant were used. The results of experiments are as follows. (1) Before head crash, it is found that the head take-off height decreases and the friction force between head and disk gradually increases as a results of disk asperity wear. (2) At the moment of Head Crash, it is found that wear scar appears on the disk surface, that the friction force and the AE signal increase suddenly, and that read-out signal decreases. (3) The observation of sliding surfaces through sapphire head and the increase of the friction force at the moment of head crash show that the Head Crash is triggered by the intrusion of a wear particle into the head-to-disk interface. From above, a model of head crash process during CS/S operation is derived.
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