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The final byte of the CDB is called the &RQWURO byte. Its contents are defined in the
next figure and table. In the remainder of this chapter, the Flag and Link bytes will
not be redefined each time they appear as part of a command.
Byte
76543210
--- Unused Reserved Flag Link
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Unused Bits 6 & 7 of the Control Byte are reserved for vendor-specific use. They are
not used by this tape drive, so the values in each of these bits is always 0.
Flag The Flag bit is used in conjunction with the Link bit to notify the initiator in
an expedient manner that a command has been completed.
/LQN
A Link bit set to 1 indicates that the initiator requests continuation of a task
(an I/O process) across two or more SCSI commands.
If the Link bit is 1 and the Flag bit is 0, and the task completes successfully,
the drive continues the task and returns a status of INTERMEDIATE and a
LINKED COMMAND COMPLETE message.
If the Link bit and the Flag bit within a Control word are both set to 1, and
the drive completes a command with a status of INTERMEDIATE, the drive
returns a LINKED COMMAND COMPLETE message (with Flag).
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