Quantum Instruments DLT 7000 manual Request Sense Data Field Descriptions, Eom, Ili, Ready

SCSI Commands

REQUEST SENSE Command (03h) (continued)

Table 5–70 REQUEST SENSE Data - Field Descriptions

Field Name	Description
Valid	When set to 1, this field indicates that the information bytes contain valid
	information as defined in the ANSI SCSI-2 specification.
Error Code	A value of 70h indicates a current error – the report is associated with the
	most recently received command.
	A value of 71h indicates a deferred error – the report is associated with a
	previous command and not as a result of the current command.
	No other values are returned in this field.
Segment Number	This value of this byte is always 0.
Filemark	This bit indicates that the current command has read a Filemark.
EOM	End of Medium. This bit indicates that an End of Medium condition (End of
	Partition or Beginning of Partition) exists. The warning is also given by setting
	the Sense Key to NO SENSE and the Additional Sense Qualifier to End of
	Partition or Beginning of Partition.
ILI	Incorrect Length Indicator. This bit indicates that the requested logical block
	length did not match the logical block length of the data on the tape
	medium. Only READ or VERIFY may cause this bit to be set.
Sense Key	In most cases, Additional Sense Code and/or Qualifier information is available.
	The codes and qualifiers are covered in detail in Table 5-72.
Information Bytes	These bytes contain the differences (residue) of the requested length minus
	the actual length in bytes, blocks, or Filemarks, as determined by the
	command. Negative values are indicated by two’s complement notation. The
	bytes are valid for all READ, WRITE, SPACE, and VERIFY tape commands for
	which a CHECK CONDITION status has been generated. The information bytes
	are 0 for MODE SELECT / SENSE, INQUIRY, READ BLOCK LIMITS, and TEST UNIT
	READY.
Additional Sense	This field specifies the number of additional sense bytes to follow. If the
Length	Allocation Length of the Command Descriptor Block is too small to transfer all
	of the Additional Sense bytes, the Additional Sense Length is not adjusted to
	reflect the truncation.
Command Specific	Command Specific Information Bytes can be logged by the operating system
Information Bytes	on error conditions. On tape medium errors, such an entry usually contains
	the current SCSI Logical Block Address.

Quantum DLT 7000 Tape System 5-147