Abstract
Novel methodology has been developed to evaluate the long term reliability of head-disc interface and to estimate drive lifetimes. The tests are based on stressed low flying or gliding as good start-stop result is only necessary but not a sufficient condition for long term reliability. Stresses are introduced by operating at low pressures at several stress levels with track following and seeking. Lifetimes are monitored by head-disc contacts with piezoelectric sensors, magnetic signals and error rates. Lifetimes determined in stressed conditions are extrapolated to normal operating conditions. Magnetic recording drives having zone textured media and operating at average flying height of 25 nm at the inside diameter have estimated average lifetimes of 3 years with standard deviation of 1.3 years in continuous operation.
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