User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Request Volume Element Address (B5h)
Quantum DX-Series Software Interface Guide 85
The Byte Count of Descriptor Data Available indicates the number
of bytes (minus 7) of descriptor data (excluding this header) that are
returned for the descriptors of the specified type if an adequate
allocation length had been specified.
There are 4 different types of element descriptor blocks, one for each type
of element. There are several fields which are found in more than 1 type
of element descriptor as well as fields which are unique to an element
descriptor. The fields common to more than 1 type of element descriptor
have the same name in the illustrations and descriptions that follow. The
format of an element descriptor for an element of the medium transport
element type is shown in
table 56.
Table 56 Medium
Transport Element
Descriptor
Bit/Byte 7 6 5 4 3 2 1 0
0
(MSB)
Element Address
1
(LSB)
2
Reserved (00h) Except Rsvd (0) Full
3
Reserved (00h)
4
Additional Sense Code
5
Additional Sense Code Qualifier
6
Reserved (000000h)
7
8
9
SValid
(0)
Invert
(0)
Reserved (00h)
10
Source Storage Element Address (0000h)
11
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Primary Volume Tag Information (if present)