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2.8 Command Processing Exceptions
C141-C013 117
The HDD terminates abnormally all commands and tasks (which are being
executed or are being queued) which it has already received from an overlapping
INIT and also terminates abnormally both the command or task that caused the
overlap, in the order described below.
1) If, during execution of a command received from an INIT, the HDD
terminates execution of the command. If the command is still in the queue
and has not yet been executed, the HDD clears that command.
2) The HDD reports the CHECK CONDITION status with for the command that
caused the overlap. The sense data generated by the HDD at this time shows
ABORTED COMMAND [= B]/Overlapped commands attempted [= 4E-00].
3) The HDD reports the OVERLAPPED TAG ATTEMPTED [=0A] response
with for the task that caused the overlap.
1) The INIT is permitted to sent an ABORT TASK, ABORT
TASK SET, CLEAR TASK SET, LOGICAL UNIT RESET, or
HARD RESET command, specifying the logical unit in order to
terminate processing of a command that is currently
disconnecting. (Shown in item 2.8.5.)
2) Overlapped command specifications are applicable without
dependence on the type of command that was issued second.
For example, even if the command that was issued second is an
INQUIRY or REQUEST SENSE command, the HDD reports
the CHECK CONDITION status and terminates both
commands abnormally.
2.8.2 Illegal LUN specification
The HDD supports only the logical unit number (LUN) LUN = 0. If a LUN other
than this is specified, the HDD operates in one of the following ways, depending
on the type of command that is issued at that time.
1) For an INQUIRY command, even if an invalid LUN is specified, the
command is executed normally. However, byte 0 of the "Standard INQUIRY
Data" transferred to the INIT by that command (the "Qualifier" field and the
"Device Type Code" field) shows X'7F'.
2) If an invalid LUN is specified for any command other than the INQUIRY
command or the REQUEST SENSE command, that command is executed
normally.