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2.7 LED Display
C141-C013 115
The HDD enters the Active_Wait state after the power is turned on. When
the spindle motor reaches the state of steady rotation with NOTIFY for the
first time after the power is turned on, the HDD reads the "System
Information" from the system space on the disk drive and initializes each type
of control information. ("System information" includes such information as
information on MODE SELECT parameters and disk media defects). When
this operation is completed, the HDD enters the Active state.
If, at this time, the system information fails to be read or the initialization of
the disk medium (formatting) does not end normally for some reason, data on
the medium cannot be accessed even when the HDD enters the Active state.
• Commands that can be executed even in the Not Ready state
When the HDD receives any of the following commands, the HDD executes the
command even in the Not Ready state:
• START/STOP UNIT command
• RESERVE or RESERVE EXTENDED command
• RELEASE or RELEASE EXTENDED command
• WRITE BUFFER command
• READ BUFFER command
• INQUIRY command
• REQUEST SENSE command
When the HDD is in the sense data holding state and the REQUEST SENSE
command is executed normally, the HDD sends the sense data held at this time to
the INIT. When the HDD is not in the sense data holding state, the HDD sends
sense data corresponding to the state of the HDD at this time to the INIT.
• Operation when formatting is not completed normally
While the FORMAT UNIT command is not being executed following a change of
parameters related to data format using the MODE SELECT command, or when
the operation terminates abnormally for some reason (for example, the power
going off or a HARD RESET) during FORMAT UNIT command execution, the
data on the disk medium cannot be accessed normally. In this case, the HDD
responds to disk media access commands with the CHECK CONDITION status.
The sense data generated in the former case shows MEDIUM ERROR [= 3]/Medium
format corrupted [= 31-00], and in the latter case, MEDIUM ERROR [= 3]/FORMAT
command failed [= 31-01]. In both cases, the HDD is restored to a usable condition by
using the FORMAT UNIT command and initializing the disk medium.
2.7 LED Display
Table 2.7 lists the items displayed by the HDD READY LED.