Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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If ByteChk=1, and VRPROTECT is not set to 000b, checking of protection information is performed on the fields described
above as a byte-by-byte comparison against the data transferred to the drive by the initiator during the Data Out phase..
Refer to the ANSI T10 standards for additional details of protection information.