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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-163

4.15.3 Enhanced Medium Auxiliary Memory (EMAM)

Attributes

This section describes the specific composition of Enhanced Medium Auxiliary Memory (EMAM)

attributes. Each EMAM attribute is identified by a 2-byte attribute ID.

Attribute Format

Each EMAM attribute is communicated between the application client and the drive in the format

shown in Figure 4-89 and described in Table 4-95. This format is used in the parameter data for the

WRITE ATTRIBUTE command (see Section 4.37) and the READ ATTRIBUTE command (see

Section 4.15).

The attribute ID, format, and length are also sometimes referred to as the attribute header. The value of

the EMAM attribute header implies nothing about the physical representation of an attribute in the

medium auxiliary memory.

Figure 4-89. EMAM Attribute — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 – 1

(MSB)

Attribute Identifier

(LSB)

Read

Only

Reserved Format

3 – 4

(MSB)

Attribute Length (n – 4)

(LSB)

5 – n

(MSB)

Attribute Value

(LSB)

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 293 294

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 205