The Identify command information (i.e.,
the PROTECT bit in the standard inquire data and the SPT field in the extended
inquire VPD page ) define which type of protection the logical unit supports.
This information is used by an application client to determine which types
of protection it can format the logical unit to.
The Read Capacity command information
indicates (i.e., the P_TYPE field and the PROT_EN bit) the type of protection
to which the logical unit has been formatted. This information is used
by an application client to determine the type of protection the logical
unit is currently formatted to.
There seems to be a difference between the
SUPPORTED PROTECTION TYPES defined in Table 331 of spc4r04, and the P_TYPE
definitions of the READ CAPACITY (16) Parameter data defined in Table 43.
The way I read the definitions of these two
items sounds like they are defining the same thing.
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