User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Write Buffer (3Bh)
Quantum DX-Series Software Interface Guide 275
Table 223 WRITE
BUFFER Command
Data - Field
Descriptions
Write Combined
Header and Data
Mode (000b)
3
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.
Write Data Mode
(010b)
3
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 power-fail occurs, or if the
reprogramming fails before completion, the tape drive
subsystem becomes unusable and the tape drive must be
replaced.
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.
ModeDescription
000b WRITE combined header and data
010b WRITE data (4k buffer)
100b Download Microcode (4k buffer)
101b Download Microcode and Save (4k buffer)
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