Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Write Buffer Command (3BH)
Chapter 22-100
Buffer Offset Indicates at what address the data is written, offset
from the beginning of the buffer. Must be set to 0 when
using Download Microcode ID.
Parameter List
Length Indicates the number of data bytes to be written in the
buffer.
Buffer RAM Indicates the data buffer space used for transfer to and
from the optical disk.
Download
Microcode Indicates the code the drive uses to operate.
Serial Number and
Manufacturing
Date Code Indicates the drive’s serial number and date code, which
indicates the week of manufacturing.
Customer and
Product ID Indicates the Vendor Identification and Product
Identification fields of the INQUIRY command
Response Data.
Table 2-87 Buffer Access Mode and ID
Buffer Type Buffer ID Mode
Buffer RAM 0 0
Download Microcode 1 4
Serial Number and Manufacturing Date 4 1
Customer and Product ID 15 1
Table 2-88 Mode Descriptions (For 2.6 Gbyte Capacity Drives Only)
Mode Description
1 Vendor specific
4 Download microcode
0 Data retained for subsequent read buffer command