Reference Guide

Chapter 4 SCSI Commands
Overview of SCSI Command and Status Processing
DLT-S4 Interface Reference Guide 27
The Data Out column in table 13 lists the information the initiator passes
to the drive as part of the command. The Data In column lists the
information the drive sends to the initiator. Numbers in parentheses after
an item indicate the item’s length in bytes. In some cases, additional
length information is communicated during DATA.
Table 13 Command Contents
Command Length in CDB Data Out (to drive) Data In (from drive)
ERASE 0 --- ---
INQUIRY Allocation --- Standard Inquiry or a Vital
Product Data page
LOAD UNLOAD 0 --- ---
LOCATE 0 --- ---
LOG SELECT Parameter List Write Error Count
Page, Read Error
Count Page, and
Compression Ratio
Page
---
LOG SENSE Allocation --- Log Page
MODE
SELECT (6) / (10)
Parameter List Mode Parameter
Header (4) Block
Descriptor (8) Page(s)
---
MODE
SENSE (6) / (10)
Allocation --- Mode Parameter Header (4)
Block Descriptor (8) Page(s)
PERSISTENT RESERVE IN Allocation --- Parameter Data
PERSISTENT RESERVE
OUT
Parameter Length Parameter List ---
PREVENT ALLOW MEDIUM
REMOVAL
0 --- ---
READ Transfer --- Data
READ BLOCK LIMITS 0 --- Block Length Limits
READ BUFFER Allocation --- Buffer Offset and Allocation
Length and/ or Test Data
READ POSITION Determined by
Long Bit
--- Position Identifier or
SCSI Logical Address