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Chapter 3 Media Changer Commands
Read Element Status Command (B8h)
Quantum ATL SuperLoader Software Interface Guide 131
Figure 66 Data
Each element descriptor includes the element address and status
flags; it may also contain sense code information as well as other
information depending on the element type (see Medium
Transport Element Descriptor on page 131 through Data Transfer
Element Descriptor on page 137).
Medium Transport
Element
Descriptor
3
Figure 67
defines the medium transport element descriptor.
Field Name Description
Element
Type Code
Indicates the element type (see table 54
on page 127)
reported by this page.
PVOLTAG When set to 1, indicates that the Primary Volume Tag
Information field is present in each of the following
element descriptor blocks. A value of zero indicates
that these bytes are omitted from the element
descriptors that follow.
AVOLTAG This field is sent as 0. Alternate volume tag
information is not supported.
Element
Descriptor
Length
Indicates the number of bytes in each element
descriptor.
Byte Count
Of
Descriptor
Data
Available
Indicates the number of bytes of element descriptor
data available for elements of this element type
meeting the request in the CDB. This value shall not be
adjusted to match the Allocation Length available.
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