Write Buffer Command 3Bh | Quantum Instruments DLT 7000 manual

SCSI Commands

WRITE BUFFER Command (3Bh) (continued)

Table 5–83 WRITE BUFFER Command Data - Field Descriptions

Field Name	Description

Mode	The tape drive supports the following values within the field. If any other value is
	set, the drive terminates the command with CHECK CONDITION status and an
	ILLEGAL REQUEST sense key set.
	Mode	Description
	000b	WRITE combined header and data (Section 5.26.1)
	010b	WRITE data (Section 5.26.2)
	100b	Download Microcode (Section 5.26.3)
	101b	Download Microcode and Save (Section 5.26.4)
Buffer ID	For all of the modes described for the Mode field, only a Buffer ID of 0 is supported.
	If the Buffer ID field is a value other than 0, the command is rejected. The target
	detects and rejects commands that would overrun the buffer.
Buffer Offset	See Sections 5.26.1 through 5.26.4 for the appropriate settings.

5.26.1 Write Combined Header and Data Mode (000b)

The data to be transferred is preceded by a 4-byte header consisting entirely of reserved bytes. This header is discarded (not stored within the buffer).

The buffer offset field must be 0 for this mode.

5.26.2 Write Data Mode (010b)

Similar to Header and Data Mode, except there is no header in the data passed to the target. Any potential buffer overruns are detected and the command is rejected.

CAUTION

During the actual reprogramming of the FLASH EEPROM, if any type of powerfail occurs, or if the reprogramming fails before completion, the tape drive subsystem becomes unusable and the tape drive must be replaced.

Quantum DLT 7000 Tape System

5-171

DLT 7000 specifications

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Quantum Instruments DLT 7000 Write Buffer Command 3Bh, Write Combined Header and Data Mode 000b

Models: DLT 7000