QNAP VS-2004L en - Manual (Page 33)

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Beep Alarm (beep alarm can be disabled in ‘System Tools’ > ‘Hardware Settings’)
Beep sound No. of Times Description
Short beep (0.5 sec) 1 1) The NVR is starting up
2) The NVR is being shut down (software
shutdown)
3) The reset button is pressed
4) The system firmware has been updated
Short beep (0.5 sec) 3 The NVR data cannot be copied to the external
device by pressing the
one-touch-auto-video-backup button.
Short beep (0.5 sec),
long beep (1.5 sec) 3, every 5 min The system fan is out of function
Long beep (1.5 sec) 2 1) The disk volume is going to be full
2) The disk volume has reached its full
capacity
3) The hard drives on the NVR are in degraded
mode
4) Hard disk rebuilding process starts
1 1) The NVR is turned off by force shutdown
(hardware shutdown)
2) The NVR has been turned on successfully
and is ready