User's Guide

Chapter 2 Media Changer Commands
Mode Sense (6) / (10) Command (1Ah/ 5Ah)
Quantum SuperLoader 3 Software Interface Guide 50
MODE SENSE
may be either MODE SENSE (6) or MODE SENSE (10). MODE
SENSE (6)
data contains a 4-byte header followed by one 8-byte block
descriptor, followed by zero or more variable length pages, depending on
the
Page Code and Allocation Length.
Mode Sense Data
Headers 2
The MODE SENSE (6) and MODE SENSE (10) headers are illustrated in the
following figures.
11 Report Saved Values
Note that the media changer device does not support saved values.
Page Code This field allows the host to select any specific page or all of the pages
supported by the media changer.
Page Code Description
1Ch “
TapeAlert Page (1Ch)” on page 53
1Dh “
Element Address Assignment Page” on page 56
1Eh “
Transport Geometry Parameters Page” on page 58
1Fh “
Device Capabilities Page” on page 60
3Fh Return all pages
SubPage This field can have three values:
41h Extended Device Capabilities SubPage
FFh All SubPages
00h No SubPage format
Allocation
Length
This field specifies the number of bytes that the host has allocated for
returned
MODE SENSE data. An allocation length of zero indicates that the
media changer will return no
MODE SENSE data. This is not considered an
error, and
GOOD status is returned.
Field Name Description