Panasonic CF-W4 Series Reference Manual page 26

Confirm the Status Using the LEDs
Indicators Indicators Name
A on the DVD-ROM & CD-R/RW
left drive indicator
SD memory card indicator
Status
Not lit
Drive power is off.
Green
Drive power is on, but the DVD-ROM & CD-R/
RW drive is not accessed.
Blinking green
Drive power is on, and the DVD-ROM & CD-
R/RW drive is either being accessed or the
disk cover is ready to open.
How to switch the drive power on/off:
This indicator lights when the SD memory card is
accessed.
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