Fujitsu MBA3073RC LED Display, ∙ Commands that can be executed even in the Not Ready state

2.7 LED Display

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.

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