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12. Appendix E
SONY AIT-3Ex drive SDX-800V series Ver.1.1
12-3
Table 12-3: MAM Attribute states
Attribute Type Attribute State Description
Read Only An application server may read the contents of the
attribute with the READ ATTRIBUTE command, but
an attempt to clear or change the attribute using the
WRITE ATTRIBUTE command shall result in the
command being terminated with a CHECK
CONDITION status. When the READ ONLY bit is
one, the attribute is in the read only state.
Medium or
Device
Unsupported The device server does not support the attribute and
shall not return it in response to a READ ATTRIBUTE
command.
Nonexistent A host attribute does not exist in the medium auxiliary
memory until a WRITE ATTRIBUTE command
creates it.
Host
Read/Write The attribute has been created using the WRITE
ATTRIBUTE command. After the attribute has been
created, the contents may be altered using
subsequent WRITE ATTRIBUTE commands. A
read/write attribute may be returned to be
nonexistent state using a WRITE ATTRIBUTE
command with the attribute length set to zero. When
the READ ONLY bit is zero, the attribute is in the
read/write state.
Read and Write Attribute Commands:
The read (8Ch) and write (8Dh) attribute commands will be implemented follows.
12.6. MEDIUM AUXILIARY MEMORY ATTRIBUTE DATA
Attribute Format
Each medium auxiliary memory attribute shall be communicated between the application client
and device server in the format shown in table 14.0. This format shall be used in the parameter
data for the WRITE ATTRIBUTE command and the READ ATTRIBUTE command. The attribute
format in this standard implies nothing about the physical representation of an attribute in the
medium auxiliary memory.
Table 12-4: MAM ATTRIBUTE Format
Bit
Byte
7 6 5 4 3 2 1 0
0
1
(MSB)
ATTRIBUTE IDENTIFIER
(LSB)
2 READ
ONLY
Reserved FORMAT
3
4
(MSB)
ATTRIBUTE LENGTH (n-4)
(LSB)
5
N
(MSB)
ATTRIBUTE VALUE
(LSB)
The ATTRIBUTE IDENTIFIER field contains a code value identifying the attribute.