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4.4.8 LED Indications
The ODD notifies the operator of a serious error by turning on or blinking the LED lamp. Table
4.17 lists indication modes and operation.
Table 4.17 LED indications
LED blink cycle Operation
Off Command wait state
On Command processing
Seek operation
Read/write processing (including cache processing)
Formatting
Power-on diagnostics
Spinning up (Including return from standby mode)
Spinning down (Including shifting to standby mode)
Blinking (on for a second and off for a
second repeatedly)
Starting the download only firmware (*1)
Blinking (on for 0.25 second and off
for 0.25 second repeatedly)
A power-on diagnostics error occurred.
Blinking (on for 0.5 second and off for
0.5 second repeatedly)
A thermal alarm occurred.
*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.