User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Read Element Status (B8h)
60 Quantum DX-Series Software Interface Guide
• Byte Count of Descriptor Data Available
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 types of element descriptor blocks, 1 for each element type.
• There are several fields found in more than 1 element type descriptor,
as well as fields which are unique to an element descriptor
• Fields found in more than 1 type of element descriptor are indicated
by the same name in the following illustrations and descriptions
• The format of an descriptor for an element of the medium transport
element type is shown in
table 42.
Table 42 Medium
Transport Element
Descriptor
Bit/Byte 7 6 5 4 3 2 1 0
0
(MSB)
Element Address
1
(LSB)
2
Reserved (00h) Except
Rsrvd
(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