Quantum 1200 Series DAT Autochanger Guia do Utilizador descarregar pdf (Página 292)

WRITE BUFFER Command (3Bh) SDLT 600 SCSI Interface Guide

4-250 January 2005 81-81200-02 REV A01

4.38.1 Write Combined Header and Data Mode (00h)

The data to be transferred is preceded by a 4-byte header consisting entirely of reserved bytes. The

drive discards this header (it is not stored in the buffer).

The Buffer Offset field must be set to 0 for this mode.

4.38.2 Write Data Mode (02h)

This mode is similar to Header and Data Mode, except that there is no header in the data passed to the

drive. The drive detects any potential buffer overruns and rejects the WRITE BUFFER command.

Table 4-146. WRITE BUFFER Command Descriptor Block — Field Descriptions

Field Name Description

Mode The drive supports the following values in this field. If any other value is set,

the drive terminates the command with CHECK CONDITION status, Sense

Key set to ILLEGAL REQUEST.

Mode Description

00h Write Combined Header and Data

02h Write Data

04h Download Microcode

05h Download Microcode and Save

0Ah Write Data to Echo Buffer

Buffer ID The modes described for the Mode field only support a Buffer ID of 0, except

Echo Buffer mode, which ignores the Buffer ID field. If the Buffer ID field is a

value other than 0, the drive rejects the command. The drive also detects and

rejects commands that would overrun the buffer.

Buffer Offset This field contains the offset in bytes from the beginning of the buffer.

1 2 ... 287 288 289 290 291 292 293 294

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Quantum 1200 Series DAT Autochanger Guia do Utilizador Página 292