SCSI Commands: 29BREAD ATTRIBUTE
Page
129
3.17.2
READ ATTRIBUTE Service Action Codes
The service actions defined for the READ ATTRIBUTE command are shown in the
table below.
Code Name
Description
00h
ATTRIBUTE VALUES
Return attribute values
01h ATTRIBUTE
LIST Return a list of available attribute identifiers that are not in
the nonexistent state or unsupported state.
02h
VOLUME LIST
Returns a list of known volume numbers
03h
PARTITION LIST
Returns a list of known partition numbers
04h
Restricted
Not a part of SSC standards
05-1Fh
Reserved
Reserved for future use. Do not use.
3.17.3
ATTRIBUTE VALUES Service Action
The READ ATTRIBUTE command with ATTRIBUTE VALUES service action returns
parameter data containing the attributes specified by the PARTITION NUMBER,
VOLUME NUMBER, and FIRST ATTRIBUTE IDENTIFIER fields in the CDB.
The returned parameter data contains the requested attributes in ascending
numerical order by attribute identifier value and in the format shown below.
Bits
Byte
7 6 5 4 3 2 1 0
0
(MSB)
3
AVAILABLE DATA (
n
-3)
(LSB)
Attribute(s)
4
(MSB)
Attribute 0
(LSB)
.
.
.
(MSB)
n
Attribute
x
(LSB)
The AVAILABLE DATA contains the number of bytes of attribute data in the
parameter list.
3.17.4
ATTRIBUTE LIST Service Action
The READ ATTRIBUTE command with ATTRIBUTE LIST service action returns
parameter data containing the attribute identifiers that are not in the unsupported
state and not in the nonexistent state in the specified partition and volume number.
It is important to note that the Attribute List varies dependent upon several factors.
These factors include medium type (data cartridge or cleaning cartridge), state of
media initialization (initialized or un-initialized) and MAM Application Specific page
contents. The contents of the FIRST ATTRIBUTE IDENTIFIER field in the CDB are
ignored.
The returned parameter data contains the requested attribute identifiers in
ascending numerical order by attribute identifier value and in the format shown
below.
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