AVolTag:
Alternate Volume Tag. The library does not support dual sided media. Therefore the Alternate
Volume Ta g label is always set to zero even when the VolTag bit is set in the CDB.
Data Transfer Element Address:
This field provides the address of the data transfer element of this changer device whose status is
reported by this element descriptor block.
Access:
When 1 indicates that access to the data transfer element by a medium transport element is
allowed. If 0 access to the data transfer element by a medium transport element is denied. Note
that a value of 1 in this bit may not be sufficient to ensure a successful operation. Access is set to
0 if the drive has an error that would prevent it from being used. For example, if there is a
communication failure between the medium changer and the tape drive Access is set to 0.
Except:
An Except bit of 0 indicates the data transfer element is in a normal state; When set to 1 indicates
an abnormal state (information about an abnormal state may be available in the additional sense
code and additional sense code qualifier bytes).
Full: A Full bit value of 1 indicates that the data transfer element of the changer device contains a tape
cartridge. A value of 0 indicates the data transfer element is empty.
Additional Sense Code:
This field may provide specific information about the abnormal data transfer element state.
Additional Sense Code Qualifier:
This field may provide more detail about an abnormal data transfer element state.
IDValid:
The IDValid bit is set to one, the SCSI Bus Address field reports the SCSI address of the Data
Transfer Element.
SCSI Bus Address:
This field returns the SCSI Bus Address of the Data Transfer Element.
SValid:
Source Valid. When set to 1, indicates that the Source Storage Element Address field and the
Invert bit fields are valid. When 0, indicates that the values in these fields are not valid.
Invert:
The library uses single sided media and does not support inverting of the media. The value
reported for this field is 0.
ED: An ED bit of one indicates the element is disabled (e.g. the tape drive is not installed or has been
logical disabled). An ED bit value of zero indicates the element is enabled.
Medium Type:
The Medium Type field provides the type of medium currently present in the data transfer element.
The next table describes the values for the Medium Types :
0h Unspecified
1h Data Medium
2h Cleaning Medium
3h Diagnostics Medium
4h WORM Medium
5h - 7h Reserved
Chapter 3. Supported SCSI Commands 3-63
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