Data storage device encoding and interleaving codewords to improve trellis sequence detection

A data storage device comprising:

• a storage medium;
• and
• control circuitry configured to:
• encode first data into a first codeword;
• encode second data into a second codeword;
• execute a non-uniform interleaving of the first codeword to generate a first non-uniform interleaved codeword;
• execute a non-uniform interleaving of the second codeword to generate a second non-uniform interleaved codeword;
• execute a uniform interleaving of the first non-uniform interleaved codeword and the second non-uniform interleaved codeword to generate an interleaved codeword;
• and
• write the interleaved codeword to the storage medium.

A method of operating a data storage device, the method comprising:

• first encoding first data into a first codeword;
• second encoding second data into a second codeword, wherein a first code rate of the first codeword is less than a second code rate of the second codeword;
• interleaving the first codeword and the second codeword to generate an interleaved codeword;
• and
• writing the interleaved codeword to a storage medium.

A method of operating data storage device, the method comprising:

• encoding first data into a first codeword;
• encoding second data into a second codeword;
• executing a non-uniform interleaving of the first codeword to generate a first non-uniform interleaved codeword;
• executing a non-uniform interleaving of the second codeword to generate a second non-uniform interleaved codeword;
• executing a uniform interleaving of the first non-uniform interleaved codeword and the second non-uniform interleaved codeword to generate an interleaved codeword;
• and
• writing the interleaved codeword to a storage medium.

Control circuitry for use in a data storage device comprising a storage medium, the control circuitry configured to:

• first encode first data into a first codeword;
• second encode second data into a second codeword, wherein a first code rate of the first codeword is less than a second code rate of the second codeword;
• interleave the first codeword and the second codeword to generate an interleaved codeword;
• and
• write the interleaved codeword to the storage medium.

Control circuitry for use in a data storage comprising a storage medium, the control circuitry configured to:

• encode first data into a first codeword;
• encode second data into a second codeword;
• execute a non-uniform interleaving of the first codeword to generate a first non-uniform interleaved codeword;
• execute a non-uniform interleaving of the second codeword to generate a second non-uniform interleaved codeword;
• execute a uniform interleaving of the first non-uniform interleaved codeword and the second non-uniform interleaved codeword to generate an interleaved codeword;
• and
• write the interleaved codeword to the storage medium.