Bit 7 6 5 4 3 2 1 0
Byte
4 Reserved
5 - 7 Byte Count of Descriptor Data Available
Field descriptions:
Element Type Code:
This field specifies the element type of the next element descriptor(s). The supported element type
descriptors are:
1h Medium Transport Element
2h Storage Element
3h Import / Export Element
4h Data Transfer Element
PVolTag:
Primary Volume Tag. If the PVolTag bit is set, the device returns Primary Volume Ta g information
in the Storage and Data Transfer Element descriptors.
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.
Element Descriptor Length:
This field indicates the number of bytes in each element descriptor.
Byte Count of Descriptor Data Available:
This field indicates the number of bytes of element descriptor data available for elements of this
element type that meet the request in the CDB. The value is not adjusted to match the allocation
length available.
The element descriptors include the element address and status flags for the elements and may also
contain sense code information and/or other information depending on the element type. The following
subsections describe each of the possible element descriptors.
Medium Transport Element Status Page (01h)
The Medium Transport Element is the device that physically moves the tapes around in the library. The
library has one Medium Transport element. This element can be addressed explicitly with the Medium
Transport Element address or, implicitly as address 0.
Bit 7 6 5 4 3 2 1 0
Byte
Subheader
0 Element Type Code (1h = Medium Transport)
1 PVolTag AVolTag Reserved
2 - 3 Transport Element Descriptor Length
4 Reserved
5 - 7 Byte Count of Descriptor Data Available
Element Descriptor
8 - 9 Medium Transport Element Address
Chapter 3. Supported SCSI Commands 3-55
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