A data-packing device, such as a direct memory access controller (DMA), aligns data at a granularity smaller than an error protected unit (EPU) encoded by an error correction code (ECC) in the memory. For example, the data alignment is at a double-word level or a byte level. The data-packing device reads data from the memory, shifting the data, and marks a good data unit as corrupted if the data unit constitutes a fractional portion of a corrupted EPU. The marking of the data unit is performed by inverting a parity bit of the data unit.

 
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