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C141-E124-01EN1 - 30
(1) General response in not ready state
The IDD reports a CHECK CONDITION status for a command, except in cases where the
command is one of the commands in item (2). The sense data generated at this time depends on
the state of the IDD, as shown in Table 1.3.
Table 1.3 Sense data in not ready state
IDD State Sense Key Sense Code
Spindle motor not
rotating at normal speed.
NOT READY
[=2]
Logical unit not ready
[=04-01]
Reading system
information have not
completed.
NOT READY
[=2]
Logical unit not ready
[=04-01]
Reading system
information failed.
HARDWARE ERROR
[=4]
Logical unit failed self-configuration
[=4C-nn]
(2) Commands that can be executed even in the not ready state
If the IDD receives any of the following commands, it executes those commands even if it is in the
Not Ready state.
• START/STOP UNIT command
• RESERVE command
• RELEASE command
• WRITE BUFFER command
• READ BUFFER command
• INQUIRY command
• REQUEST SENSE command: The REQUEST SENSE command is executed normally. If the
IDD is in the sense data hold state, the sense data being held at that time are transferred to the
INIT. If not, sense data appropriate to the IDD’s state at that time are transferred to the INIT (See
Table 1.3).
• REZERO UNIT command: If the spindle motor has reached the normal rotational speed, this
command is executed even if reading of system information failed. If the spindle motor has not
reached the normal rotating speed, or if reading of system information is still in progress, a
CHECK CONDITION status is reported as in item (1).