Seagate Ultra 160 ユーザーズマニュアル

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                                                      Parallel SCSI Interface Product Manual, Rev. A 

A task manager that detects an incorrect initiator connection shall abort all tasks for the initiator and the associ-
ated logical unit and shall return CHECK CONDITION status for the task that caused the incorrect initiator con-
nection. The sense key shall be set to Aborted Command and the additional sense code shall be set to 
Overlapped Commands Attempted with the additional sense code qualifier set to the value of the duplicate tag 
(see Section 4.4).

An incorrect initiator connection may be indicative of a serious error and, if not detected, could result in 
a task operating with a wrong set of pointers. This is considered a catastrophic failure on the part of the 
initiator. Therefore, vendor-specific error recovery procedures may be required to guarantee the data 
integrity on the medium. The target may return additional sense data to aid in this error recovery proce-
dure (e.g., sequential-access devices may return the residue of blocks remaining to be written or read 
at the time the second command was received).

An unexpected RESELECTION phase occurs if a SCSI target port attempts to do a physical reconnect to a 
task for which a nexus does not exist. a SCSI initiator port should respond to an unexpected RESELECTION 
phase by sending an ABORT TASK message.