HDD MAGNETIC HEAD DEGRADATION FIELD-FAILURE DETECTION AND PREDICTION

摘要

A method, apparatus, and system for implementing head degradation detection and prediction for hard disk drives (HDDs) are provided. Statistical parameter stability tests are used that are calculated as Confidence Intervals (CIs) from HDD parameter measurements. HDD parameters include, for example, change or delta in fly height (dFH), magnetic resistor resistance (MRR) head values, servo variable gain amplifier (SVGA) readback amplitude values, that are used in conjunction with two or more confidence level indicators and an Auto-Regressive Integrated Moving-Average (ARIMA) (p, d, q) predictor for head degradation detection and field failure prediction.

主权项

1. A method for implementing head degradation detection and field failure prediction for hard disk drives (HDDs), said method comprising:
calculating two or more confidence level indicators for predefined HDD head parameters; comparing said calculated confidence level indicators with a respective predefined threshold value for the predefined HDD head parameters for providing a head failure prediction; and identifying both soft error rate (SER) fluctuations, and an error recovery procedure (ERP) count exceeding a prespecified threshold, to provide the head failure prediction.