Sony SDX-800V/R manual Attribute Values service action, Read Attribute service action codes

6.Command Specification			READ ATTRIBUTE
		Table 6-64: READ ATTRIBUTE service action codes
	Code	Name	Description
	00h	Attribute Values	Return attribute values.
	01h	Attribute List	Returns a list of available attribute identifiers, identifiers
			that are not in the nonexistent or unsupported state.
	02h	Volume List	Return a list of known Volume Numbers.
	03h	Partition List	Return a list of known Partition Numbers.
	04h	Reserved for SMC-2
	05h – 1Fh	Reserved

The VOLUME NUMBER specifies a volume within the Medium Auxiliary Memory. The number of volumes of the MAM shall equal that of the attached multi-volume medium. If the medium only has a single volume, then its volume number shall be zero.

The PARTITION NUMBER specifies a partition within a volume. The number of partitions of the MAM shall equal that of the attached multi-partition medium. If the medium only has a single partition, then its partition number shall be zero.

If the combination of VOLUME NUMBER and PARTITION NUMBER is not valid, the command shall be terminated with CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST, and the additional sense data shall be set to INVALID FIELD IN CDB.

The FIRST ATTRIBUTE IDENTIFIER field specifies the attribute identifier of the first attribute to be returned. If the specified attribute identifier is in the unsupported or nonexistent state, the READ ATTRIBUTE shall be terminated with a CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST, and the additional sense data shall be set to INVALID FIELD IN CDB.

The ALLOCATION LENGTH field specifies how many bytes have been allocated of the first attribute to be returned. If the length is not sufficient to contain the entire parameter list, the first portion of the list shall be returned. This shall not be considered an error. If the remainder of the list is required, the application client should either send a new READ ATRRIBUTE command with an ALLOCATION LENGTH field large enough to contain the entire parameter list or use the FIRST ATTRIBUTE IDENTIFIER field to restrict the attributes returned.

The format of parameter data returned by the READ ATTRIBUTE command depends on the service action specified.

6.13.1.ATTRIBUTE VALUES service action

The READ ATTRIBUTE command with ATTRIBUTE VALUES service action returns parameter data containing the attributes specified by the PARTION NUMBER, VOLUME NUMBER, and FIRST ATTRIBUTE INDENTIFIER fields in the CDB. The returned parameter data shall contain the requested attributes in ascending numerical order by attribute identifier value and in the format shown in table 6-65.

6-68 SONY AIT-3Ex drive SDX-800V series Ver.1.1