2.8 Command Processing Exceptions

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.

2.8.2Illegal 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.

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Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC, MBA3073RC Illegal LUN specification, Command Processing Exceptions