Read Element Status
96122 • Revision: F Chapter 6 SCSI Commands 201
Data Transfer Element Descriptor (DvcID = 1) Definitions:
Element Address This bit contains the element address of the data transfer element reported.
Access This bit indicates access is allowed to the data transfer element by the hand:
■ 0 = Access is not allowed to the tape drive element by the hand. This will be
the case when a cartridge tape is loaded and in use by the tape drive.
The tape must be ejected before it becomes accessible.
■ 1 = The tape drive is accessible.
Except This bit indicates the operational state of the data transfer element:
■ 0 = The data transfer element is in the normal state.
■ 1 = The data transfer element is in an abnormal state, and the Additional
Sense Code and the Additional Sense Code Qualifier fields contain
information regarding the abnormal state. Other fields in this descriptor
might be invalid, and should be ignored
Full This bit indicates if the data transfer element contains a cartridge tape:
■ 0 = The data transfer element does not contain a cartridge tape.
■ 1 = The data transfer element does contain a cartridge tape.
Additional Sense Code This field is valid only if the Except bit is set. In the case of an exception, it
contains an ASC as defined for Request Sense data.
Additional Sense Code
Qualifier
This field is valid only if the Except bit is set. In the case of an exception, it
contains an ASCQ as defined for Request Sense data.
SValid This bit indicates if the Source Element Address and Invert fields are valid:
■ 0 = The Source Element Address and Invert fields are not valid.
■ 1 = The Source Element Address and Invert fields are valid.
Invert The library does not support multi-sided media and returns a value of 0.
ED ■ 0 = The element is enabled (for example a magazine or drive has been
installed or has been logically enabled)
■ 1 = The element is disabled
Medium Type This field provides the type of medium currently present in the element as
determined by the medium changer.
The library returns the following values:
■ 0h = Unspecified - the medium changer cannot determine the medium type.
■ 1h = Data Medium
■ 2h = Cleaning Medium
Source Storage Element
Address
This field is valid only if the SValid bit is 1. It contains the address of the last
element from which the data cartridge was moved.
Primary Volume Tag
Information
When the PVolTag bit is set to 1, the library returns Volume Tag Information.
When PVolTag is set to 0, this field is omitted, and the reserved fields below it
are moved up.
The library Volume Tag Information includes 6 bytes of left-justified ASCII
data which represents volume/serial number data read from the cartridge
tape. The field is padded to 32 bytes with 26 ASCII spaces.
If the label on the cartridge tape is not readable, these 32 bytes will be set to 0.
The last four bytes of the Volume Tag Information have two reserved bytes and
two volume sequence bytes. The library does not support sequence numbers.
These four bytes are set to 0.
Code Set This field specifies the code set used for the identifier field:
2h = The identifier contains ASCII graphic codes
(code values 20h through 7Eh).
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