C141-E039-01EN
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1.7.2
Illegal LUN Specification
The only logical unit number (LUN) supported by the IDD is LUN = 0. If a LUN other than
this (1 to 7) is specified, the IDD performs one of the following operations, depending on the
type of command issued at that time.
1) The INQUIRY command is executed normally even if the LUN specification is illegal.
However, byte 0 of the “Standard INQUIRY Data” (“Qualifier” field and “Device Type
Code” field) transferred to the INIT for that command indicates X ‘7F.’
2) The REQUEST SENSE command is executed normally even if the LUN specification is
illegal. However, the sense data transferred to the INIT for that command indicates that
the LUN specification is illegal (ILLEGAL REQUEST [=5]/Logical unit not supported
[=25-00]).
3) If an illegal LUN is specified for a command other than the INQUIRY command or
REQUEST SENSE command, that command is terminated abnormally by a CHECK
CONDITION status. The sense data generated at this time indicate that the LUN
specification is illegal (ILLEGAL REQUEST [=5] /Logical unit not supported [=25-00]).
1.7.3
Reserved Operation Code
Group 7 command operation codes (X ‘EO’ to X ‘FF’) are reserved by Fujitsu. When any
command is issued which includes these operation codes, the IDD always must respond with a
CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid command operation code
[=20-00]. The INIT must not issue commands which contain these operation codes.
1.7.4
Command Processing in the Not Ready State
After the IDD’s power is switched on, the initial self-diagnosis is completed normally and the
spindle motor reaches the normal rotational speed, “system information,” which includes such
information as MODE SELECT parameters and disk media defect information is read from the
system space on the disk drive and each type of control information is initialized. When this
operation is completed, the IDD is in a state where it can be used (ready state). Furthermore,
the not ready state is defined as the IDD being in either of the following states.
Not Ready State:
• When the spindle motor has not reached the normal rotational speed.
• When ready of system information is not completed, or reading failed.
Also, if initialization of the disk media (formatting) has not been completed normally, it will
be impossible to access data on the disk media.
Processing of and response to commands received by the IDD when it is in the not ready state
or in the initialization incomplete state are described below. Furthermore, starting control of
the spindle motor when the power is switched on can be selected from either or two methods,
through the setting terminal (motor start mode) on the IDD, with rotation started at the same
time as when the power is switched on or through the START/STOP UNIT command.