
Host Interface
4.4.8 LED Indications
The ODD notifies the operator of a serious error by turning on or blinking the LED lamp. Table 4.16 lists indication modes and operation.
| Table 4.16 LED indications | |
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LED blink cycle | Operation | |
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Off |
| Command wait state |
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On |
| Command processing |
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| Seek operation |
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| Read/write processing (including cache processing) |
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| Formatting |
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| Spinning up (Including return from standby mode) |
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| Spinning down (Including shifting to standby mode) |
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Blinking (on for 1 second and off for | Starting the download only firmware (*1) | |
1 second repeatedly) |
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Blinking (on for 0.25 seconds and off | A | |
for 0.25 seconds repeatedly) |
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Blinking (on for 0.5 seconds and off | A thermal alarm occurred. | |
for 0.5 seconds repeatedly) |
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*1 | The ODD control firmware is stored on the flash ROM and can be | |
| downloaded from the host with the WRITE BUFFER command. However, | |
| if any problem occurs during downloading, such as power failure, |
downloading is interrupted and the microcodes in the control firmware may be damaged. To download microcode data again in such a case, the ODD starts the emergency download firmware that simply supports only the WRITE BUFFER command and other basic commands.