
4.2 Various Processes
4.2.7 LED indications
The ODD notifies the operator of a serious error by turning on or blinking an LED. Table 4.2 lists the LED indications and the corresponding operations.
Table 4.2 LED indications | |
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|
LED indication | Operation |
|
|
Off | Waiting for a command |
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|
On | Command processing |
|
|
| Seek operation |
|
|
| Read/write processing (including cache |
| processing) |
|
|
| Formatting |
|
|
| |
|
|
| Spinning up (including returning from standby |
| mode) |
|
|
| Spinning down (including shifting to standby |
| mode) |
|
|
Blinking | Starting firmware dedicated to downloading *1 |
(on for 0.1 s and off for 0.7 s repeatedly) |
|
|
|
Blinking | A |
(on for 0.1 s and off for 0.1 s repeatedly) |
|
|
|
Blinking | A thermal alarm occurred. |
(on for 0.4 s and off for 0.4 s repeatedly) |
|
|
|
Blinking | An error occurred during writing to the write |
(on for 0.1 s and off for 0.3 s repeatedly) | cache *2. |
|
|
*1 ODD control firmware is stored in flash ROM and can be downloaded from the host with the WRITE BUFFER command. However, if a problem such as a power failure occurs during downloading, downloading is interrupted and the microcodes in the control firmware may be damaged. In such a case, to download the microcode data again, the ODD starts emergency download firmware that supports only the WRITE BUFFER command and other basic commands.
*2 The LED that is blinking because of a write cache write error stops blinking when the media is ejected.