Soft decoding correctable page assisted reference voltage tracking

A method, comprising:

• reading data stored in a non-volatile storage device using a group of soft read reference voltages;
• decoding the data read from the non-volatile storage device in a soft decoding process;
• obtaining a number of ones and a number of zeros for each zone of a plurality of zones delineated by the group of soft read reference voltages;
• determining that the number of ones is equal to the number of zeros in a particular zone of the plurality of zones;
• and
• setting a voltage value between a first soft read reference voltage and a second soft read reference voltage as an optimal read reference voltage for future read operations, wherein the first soft read reference voltage is a lower boundary of the particular zone and the second soft read reference voltage is an upper boundary of the particular zone.

A computer program product comprising a non-transitory computer readable medium having instructions recorded thereon, the instructions when executed by a computer implementing a method comprising:

• reading data stored in a non-volatile storage device using a group of soft read reference voltages;
• decoding the data read from the non-volatile storage device in a soft decoding process;
• obtaining a number of ones and a number of zeros for each zone of a plurality of zones delineated by the group of soft read reference voltages;
• determining that a soft read reference voltage of the group of soft read reference voltages is a first boundary of a first zone in which the number of ones is greater than the number of zeros and a second boundary of a second zone in which the number of ones is less than the number of zeros;
• and
• setting the soft read reference voltage adjusted by an adjustment as an optimal read reference voltage for future read operations, the adjustment being obtained based on a first comparison result of the number of ones compared to the number of zeros in the first zone and a second comparison result of the number of ones compared to the number of zeros in the second zone.

A computer program product comprising a non-transitory computer readable medium having instructions recorded thereon, the instructions when executed by a computer implementing a method comprising:

• reading data stored in a non-volatile storage device using a group of soft read reference voltages;
• decoding the data read from the non-volatile storage device in a soft decoding process;
• obtaining a number of ones and a number of zeros for each zone of a plurality of zones delineated by the group of soft read reference voltages;
• determining that the number of ones is equal to the number of zeros in a particular zone of the plurality of zones;
• and
• setting a voltage value between a first soft read reference voltage and a second soft read reference voltage as an optimal read reference voltage for future read operations, wherein the first soft read reference voltage is a lower boundary of the particular zone and the second soft read reference voltage is an upper boundary of the particular zone.