Comment Re:Not really new information... (Score 2) 79
SSDs sometimes have to re-read blocks with different voltage thresholds to get good data, and make use of error correction on top.
NAND-style Flash pretty much REQUIRES a SECDED scheme as even simple reads can corrupt the storage over time. You're pretty much guaranteed a bit-flip at some point. But modern NAND controllers pretty much handle the correction and re-write "behind the scenes" by copying the whole block somewhere else (after correction) and re-mapping.