Systems and methods for detector side trapping set mitigation

A method for data processing, the method comprising:

• applying a data decoding algorithm by a data decoder circuit to a decoder input derived from a first detected output to yield a decoded output;
• identifying a potential trapping set based at least in part on the decoded output;
• using a combination of the data and a filtered version of the data input to identify an unreliable location in the data input;
• scaling at least one element of a data input to yield a scaled output based at least in part on the identification of the potential trapping set, wherein the at least one selected element of the data input scaled by the data instance modification circuit corresponds to the unreliable location;
• leaving at least another element of the data input unmodified;
• and
• applying a data detection algorithm by a data detector circuit to the scaled output guided by the decoded output to yield a second detector output.

A storage device, the storage device comprising:

• a storage medium;
• a head assembly disposed in relation to the storage medium and operable to provide a sensed signal corresponding to a data set on the storage;
• a read channel circuit including:
• an analog front end circuit operable to provide an analog signal corresponding to the sensed signal;
• an analog to digital converter circuit operable to sample the analog signal to yield a series of digital samples;
• an equalizer circuit operable to equalize the digital samples to yield a sample set;
• a data detector circuit operable to apply a data detection algorithm to a the sample set to yield a first detected output;
• a data decoder circuit operable to apply a data decoding algorithm to a decoder input to yield a decoded output, wherein the decoder input is derived from the first detected output;
• a potential trapping set detection circuit operable to identify a potential trapping set based at least in part on the decoded output;
• a data instance modification circuit operable to:
• filter the data input to yield a filtered input;
• identify an unreliable location in the data input using a combination of the data input and the filtered input;
• based at least in part on identification of the potential trapping set, scale at least one selected element of the data input corresponding to the unreliable location to yield a detector input
• leave at least another element of the data input unmodified;
• and
• wherein the data detector circuit is further operable to apply the data detection algorithm to the detector input to yield a second detected output.