SCSI Commands

READ BUFFER Command (3Ch) (continued)

5.14.1 Combined Header and Data Mode

In this mode, the tape drive returns a 4-byte header followed by data bytes. The drive terminates the DATA IN phase when the Allocation Length bytes of header and data have been transferred or when all available data has been transferred to the initiator, whichever is less. The 4-byte READ BUFFER header is followed by data bytes from the target data buffer. The figure below illustrates the format of the header.

Bit

7

6

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

0

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

1 - 3

 

 

 

Available Length

 

 

 

(LSB)

Figure 5–65 READ BUFFER Header - Data Format

Table 5–64 READ BUFFER Header - Field Descriptions

Field Name

Description

 

 

Available Length

This field specifies the total number of data bytes available in the target’s

 

buffer. This number is not reduced to reflect the allocation length, nor is it

 

reduced to reflect the actual number bytes written using the WRITE

 

BUFFER command. Following the READ BUFFER header, the target

 

transfers data from its data buffer.

 

 

5.14.2 Data Mode

In this mode, the DATA IN phase contains only buffer data.

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Combined Header and Data Mode

DLT 7000 specifications

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