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12.APPENDIX E: Medium Auxiliary Memory Attribute
SONY AIT-5 drive SDX-1100V series Ver.1.0 12-1
12. APPENDIX E: Medium Auxiliary Memory
Attribute
12.1. INTRODUCTION
This section will outline the design specifications for the implementation of selected Medium Auxiliary Memory
(MAM) attributes.
12.2. OVERVIEW
An increasing number of media types are incorporating small memory components into their products. The
creation and acceptance of the “Proposed Addition of Read and Write Attribute Commands to SPC-2” (AM
document) provides a uniform method to access the data stored on the Medium Auxiliary Memory. This section will
provide details on using MAM with this product.
12.3. MEDIUM AUXILIALY MEMORY ATTRIBUTE TYPES AND STATES
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 12-1).
Table 12-1: Types of MAM Attributes
Attribute Type Attribute Source Example Readable with
READ
ATTRIBUTE
Writable with
WRITE
ATTRIBUTE
Medium Permanently stored in the
medium auxiliary memory
during manufacture.
Media
Serial
Number
Yes No
Device Maintained by the drive Load
Count
Yes No
Host Maintained by the
application client.
Backup
date
Yes Yes
Depending on that attribute type, attributes have the states shown in Table 12-1