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Chapter 3 Media Changer Commands
Read Element Status Command (B8h)
Quantum ATL SuperLoader Software Interface Guide 133
Table 56 Medium
Transport Element
Descriptor
Field Name Description
Element Address Specifies the address of the media changer element whose status is
reported by this element descriptor block.
Except An exception bit of 0 indicates the element is in a normal state. If this bit is
1, information on the abnormal state may be available in the Additional
Sense Code and Additional Sense Code Qualifier fields.
Full When set to 1, indicates that the element contains a unit of media. A value
of zero indicates that the element does not contain a unit of media. When
the Except bit is one, the value of the Full bit is not valid.
Additional Sense
Code
Provides specific information on an abnormal element state. The values in
this field are as defined for the Additional Sense Code field of REQUEST
SENSE command response data. This field is valid only if the Except bit is
one.
Additional Sense
Code Qualifier
Provides more detailed information on an abnormal element state. The
values in this field are as defined for the Additional Sense Code Qualifier
field of REQUEST SENSE command response data. This field is valid only
if the Except bit is one.
SVALID When set to 1, indicates that the Source Storage Element Address field and
the Invert bit information are valid. A value of zero indicates that the
values in these fields are not valid.
Invert This field is sent as 0. Inverting and rotating of media is not supported.
Source Storage
Element Address
Provides the address of the last storage element this unit of media
occupied. This field is valid only if the SVALID bit is one.
Primary Volume
Tag Information
This field contains the bar code label information of the media currently
stored in this element. This is only included if VOLTAG was set and label
information is available. In which case, the PVOLTAG field shall be set on
the Element Status page header.
Code Set This field is 0.
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