Abstract: A method for storing data in a solid state device includes applying polar coding to generate channels including perfect channels, useless channels, and channels that are neither perfect nor useless. Some data is encoded using the perfect channels. A predetermined value is encoded using the useless channels. The other channels are divided into groups, depending upon a quality of each channel. Other data is encoded using the channels that are neither perfect nor useless using a different coding technique. This coding technique is applied to the same quality channels using several polar codewords, in parallel. Decoding is carried in a progressive parallel manner where the other coding technique assists the decoding of some polar codewords based on correct results from other polar codewords that were successfully decoded. The encoded data to be stored is written into the solid state device or transmitted.