1. A method comprising: in a controller of a memory device: receiving data including a data block and main error correction coding (ECC) data for the data block, the data block including a first sub-block of data and first ECC data corresponding to the first sub-block; initiating a data block ECC operation to process the data block using the main ECC data; initiating a sub-block ECC operation to process the first sub-block using the first ECC data; and selectively initiating an error location search of the data block ECC operation based on a result of the sub-block ECC operation.