Western Digital 4CH TRIPLEX - Manual (Page 66)

6-3. HDD Indicator
When the POWER is on, the hard disk indicator is displayed as the chart shows.
ITEM INDICATOR
POWER GREEN
LED
HDD ACCESS YELLOW LED
WARNING
1. DVR must be turned off when one installs a hard disk into DVR.
2. DVR must be turned off when changing hard disk.
3. The system will recognize HDD installed only when the key of the rack must
be locked.
66