Bi-directional pattern dependent noise prediction

One or more machine-readable hardware storage devices storing instructions that are executable by one or more processors to perform operations comprising:

• receiving a plurality of signal samples over a channel in a disk drive;
• executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples, with the forward PDNP operation comprising a PDNP operation with forward linear prediction;
• generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples;
• executing a backward PDNP operation on the plurality of the received signal samples, with the backward PDNP operation comprising a PDNP operation with backward linear prediction;
• generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples;
• comparing the first detection to the second detection;
• identifying, based on comparing, one or more erasures in the received plurality of signal samples;
• and
• generating one or more sequences of bits that promote correction of the one or more erasures.

An electronic system comprising:

• one or more processors;
• and
• one or more machine-readable hardware storage devices storing instructions that are executable by the one or more processors to perform operations comprising:
• receiving a plurality of signal samples over a channel in a disk drive;
• executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples, with the forward PDNP operation comprising a PDNP operation with forward linear prediction;
• generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples;
• executing a backward PDNP operation on the plurality of the received signal samples, with the backward PDNP operation comprising a PDNP operation with backward linear prediction;
• generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples;
• comparing the first detection to the second detection;
• identifying, based on comparing, one or more erasures in the received plurality of signal samples;
• and
• generating one or more sequences of bits that promote correction of the one or more erasures.