verify32 byte-by-byte app tag mask question

[John Osterlund]

* From the T10 Reflector (t10 at t10.org), posted by:
* "John Osterlund" <j.osterlund at sisa.samsung.com>
*
Scott,
I think you mean Table 79 in SBC3r21.  (In SBC3r22 it is table 87)
While I cannot find an explicit statement, I would say the following
paragraph from SBC3r21 implies that the tag mask be taken into account
since it references the table 79.
===================
If the ATO bit is set to one in the Control mode page (see SPC-4), and
checking of the LOGICAL BLOCK APPLICATION TAG field is enabled (see
table 76, table 77, table 78, and table 79 in 5.24), then the LOGICAL
BLOCK APPLICATION TAG MASK field contains a value that is a bit mask for
enabling the checking of the LOGICAL BLOCK APPLICATION TAG field in
every instance of the protection information for each logical block
accessed by the command. A LOGICAL BLOCK APPLICATION TAG MASK bit set to
one enables the checking of the corresponding bit of the EXPECTED
LOGICAL BLOCK APPLICATION TAG field with the corresponding bit of the
LOGICAL BLOCK APPLICATION TAG field in every instance of the protection
information.
======================
Others may have more definitive input.
John Osterlund
HDD Sr. Applications Engineer.
Samsung Information Systems America (SISA)
75 W. Plumeria Dr.
San Jose, CA 95134
Office: 408 544 5774
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of scott
taggart
Sent: Wednesday, May 26, 2010 9:56 AM
To: t10 at t10.org
Subject: verify32 byte-by-byte app tag mask question
* From the T10 Reflector (t10 at t10.org), posted by:
* scott taggart <taggart at taggarts.org>
*
Hi,
Referring to SBC3r22, Table 79 "VRPROTECT field with byte-by-byte set to
one":
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).
Thanks,
Scott
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