System and method for ATI/FTI detection in magnetic media

摘要

A system detects adjacent track interference (ATI)/far track interference (FTI) in a data storage system. The system includes a micro-transition generator that introduces micro-transitions into data write patterns written to a magnetic media. A spectrum analyzer analyzes in the frequency domain read-back signals generated in response to the data write patterns. In particular, the spectrum analyzer calculates first and second signal-to-noise ratios (SNRs) based on read-back signals generated before and after a center track stress test. Adjacent track interference/far track interference effects are determined based on the first and second SNR values.

主权项

1. A method of detecting adjacent track interference (ATI)/far track interference (FTI) in a data storage system, the method comprising:
introducing micro-transitions into a data write pattern; writing the data write pattern, including introduced micro-transitions, to a magnetic media at one or more radial positions relative to a center track; generating a first read-back signal in response to the data write pattern written to the magnetic media; analyzing a frequency response of the first read-back signal that includes analysis of micro-transition frequency response to determine first signal-to-noise ratios (SNRs) associated with the data write pattern written to the magnetic media; conducting a stress test by repeatedly writing data to the center track for a number of iterations; generating a second read-back signal in response to the data write pattern written to the magnetic media; and analyzing a frequency response of the second read-back signal that includes analysis of micro-transition frequency response to determine second SNRs associated with the data write pattern written to the magnetic media, wherein ATI/FTI effects are determined based on detected changes between the first SNRs and second SNRs.