Quantum Instruments DLT 7000 manual Write Command 0Ah, Write Command Data Field Descriptions

SCSI Commands

WRITE Command (0Ah) (continued)

Table 5–82 WRITE Command Data — Field Descriptions (continued)

Field Name	Description
Fixed (cont.)	When the Fixed bit is 1, the Transfer Length field specifies the number of blocks to
	be transferred to the host beginning at the current tape position. This form of WRITE
	is valid only if the logical unit is currently operating in the Fixed Block mode – when
	it has been instructed to use fixed-length blocks with MODE SELECT. The current
	block length is the block length defined in the MODE SELECT command. Upon
	termination, the tape is logically positioned after these blocks.
Transfer	This field contains the length of the data transfer in bytes or blocks depending on
Length	whether Fixed or Variable block mode is selected.
	When the Transfer Length is 0, no data is transferred and the current position on the
	logical unit is not changed.

Exception Conditions

If End of Tape (EOT) is detected while writing, the tape drive finishes writing any buffered data. The command terminates with CHECK CONDITION status. Within the sense data, the EOM bit is set, the Sense Key is set to NO SENSE, and the Additional Sense code and Additional Sense Code Qualifier fields are set to EOM/P detected. The drive attempts to complete any subsequent writes, returning a CHECK CONDITION status in each case.

If the tape drive encounters the physical End of Medium (EOM) when attempting WRITE, a CHECK CONDITION status is returned. Within the sense data, the EOM and Valid bits are set, and the Sense Key field is set to Volume Overflow. The Information fields contain the residue count and the Additional Sense code and Additional Sense Code Qualifier fields are set to EOM/P Detected. The tape is physically positioned at EOM/P.

Quantum DLT 7000 Tape System 5-169