Systems and methods for media defect detection

摘要

Various embodiments of the present invention provide systems and methods for media defect detection. For example, a data transfer system is disclosed that includes a data detector, a defect detector and a gating circuit. The data detector provides a soft output, and the defect detector is operable to receive the soft output and the data signal, and to assert a defect indication based at least in part on the soft output and the data signal. The gating circuit is operable to modify the soft output of the detector whenever the defect indication is asserted.

主权项

1. A data transfer system, wherein the decoding system comprises:
a data detector circuit operable to apply a data detection algorithm to a detector input to yield a soft output; a defect detector circuit including:
a soft analysis circuit including a comparator operable to compare the soft output against a soft threshold value;a first counter circuit operable to determine a number of periods that the soft output is below the soft threshold;a data analysis circuit including a first comparator operable to compare an absolute value of a data signal against a data threshold value, and a second counter circuit operable to determine a number of periods that the absolute value of the data signal is below the data threshold value.