Data storage device channel encoding current data using redundancy bits generated over preceding data

A data storage device comprising:

• a non-volatile storage medium (NVSM);
• and
• control circuitry configured to:
• generate first low density parity check (LDPC) parity over first data;
• generate second LDPC parity over the first data and over second data, wherein the first and second data and the first and second LDPC parity form at least part of an LDPC codeword;
• and
• store the LDPC codeword in the NVSM.

A data storage device comprising:

• a non-volatile storage medium (NVSM);
• and
• a means for generating first low density parity check (LDPC) parity over first data;
• a means for generating second LDPC parity over the first data and over second data, wherein the first and second data and the first and second LDPC parity form at least part of an LDPC codeword;
• and
• a means for storing the LDPC codeword in the NVSM.

Control circuitry configured to access a non-volatile storage medium (NVSM), the control circuitry configured to:

• channel encode a first block of data into first channel data based on a channel code constraint;
• error correction encode the first channel data to generate first redundancy bits;
• channel encode a second block of data into second channel data based on the channel code constraint and the first redundancy bits;
• error correction encode the first channel data and the second channel data to generate second redundancy bits;
• channel encode a third block of data into third channel data based on the channel code constraint and the second redundancy bits;
• and
• store the first, second and third channel data and the first and second redundancy bits in the NVSM.