verify32 byte-by-byte app tag mask question

scott taggart taggart at
Wed May 26 09:56:00 PDT 2010

* From the T10 Reflector (t10 at, posted by:
* scott taggart <taggart at>
Referring to SBC3r22, Table 79 "VRPROTECT field with byte-by-byte set to
When the device is doing the byte-by-byte check of the media data compared 
to the data-out buffer, does the app tag mask value in the CDB get taken 
into account?  For example, if the app-tag mask is all zero (0x0000), 
should the device hardware NOT compare the apptag?  Or, is the app-tag-mask 
ignored for the byte-by-byte compare (i.e. the compare ALWAYS takes place).
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