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12. Appendix E
Note: The above information has been taken from an unofficial version of the SCSI-3 Stream
Commands. In case of any conflict, the published ANSI standard
Bit
7
Byte
0
1
2
3
4
5
Note: For non-memory component media, the device firmware ignores the above command and
threads the tape in order to provide the required data.
12.5. NEW COMMANDS
A MAM attribute is represented in a format described in the next section and is composed of:
1.
An attribute identifier,
2.
An attribute format code,
3.
A bit indicating whether the identified attribute is read only,
4.
An attribute length specifying the number of bytes in the identified attribute value, and
5.
The value of the identified attribute.
There are three types of attribute (table 12-2)
Attribute
Attribute Source
Type
Medium
Permanently stored in the
medium auxiliary memory
during manufacture.
Device
Maintained by the
device server
Host
Maintained by the
application client.
Depending on that attribute type, attributes have the states shown in table 12-3
12-2
Table 12-1
6
5
4
OPERATION CODE ( 1Bh)
Reserved
Reserved
CONTROL
Table 12-2: Types of MAM Attributes
Example
Media
Serial
Number
Load
Count
Backup
date
prevails.
3
2
Reserved
Reserved
HOLD
EOT
Readable with
READ
ATTRIBUTE
Yes
Yes
Yes
SONY AIT-3Ex drive SDX-800V series Ver.1.0
1
0
IMMED
RETEN
LOAD
Writeable
with WRITE
ATTRIBUTE
No
No
Yes
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