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This may be useful if the partition contains unused blocks that are not guaranteed to contain zeroes.
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_Available since: 1.3.0 (kernel 4.5)_
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* **check_at_most_once**: Verify data blocks only the first time they are read from the data device, rather than every time.
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It provides a reduced level of security because only offline tampering of the data device's content will be detected, not online tampering.
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_Available since: 1.4.0 (kernel 4.17)_
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### Optional FEC (Forward-Error-Correction) parameters
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* **use_fec_from_device <fec_dev>**: Use forward error correction (FEC) to recover from corruption if hash verification fails.
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