Fujitsu MAA3182SC Oem Manual page 48

(1) General Response when in the 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
IDD State
Spindle motor not
rotating at normal speed.
Reading system
information but not
completed.
Reading system
information failed.
(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: The INQUIRY command is executed normally and the standard
INQUIRY data and byte 0 of the VPD information transferred to the INIT ("Qualifier" field
and "device type code" field) indicate X '00.' However, the values for several fields may
differ depending on whether or not reading of system information is completed. See the
description of the INQUIRY command (item 3.1.2) for details.
• REQUEST SENSE Command: The REQUEST SENSE command is executed normally
and if the sense data hold state exists, the sense data being held at that time are transferred to
the INIT. If the sense data hold state does not exist, sense data appropriate to the IDD's state
at that time are transferred to the INIT (See Table 1.3).
• REZERO UNIT: If the disk drive's 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).
Sense Data when in the Not Ready State
Sense Key
NOT READY
[=2]
NOT READY
[=2]
HARDWARE ERROR
[=4]
C141-E039-01EN
Sense Code
Logical unit not ready
Logical unit not ready
Logical unit failed self-
configuration
[=04-00]
[=04-00]
[=4C-nn]
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