The list of colors below will help you identify the general status of your NAS:

The front and rear LEDs indicate drive status and activity. This section describes the behavior of the LED indicators. Note that even if you have turned off the front LED using Dashboard > Eco Management, events triggering a red light will always cause the front LED to turn on.

Front LED Color	Rear LED Color	State
Blinking blue	Activity LED for working disk(s) (until they are fully initialized)	Occurs as the device is booting; will cease once the drives are fully initialized
Solid blue	Activity LED for working disk(s)	Device is functioning properly and the drives are working (read/write)
Blinking blue/red	Blinking blue/red	RAID synchronizing; will cease once operation has concluded
	Activity LED for working disk(s)	Operating system update in progress
Blinking red	Solid red for non-functional disk(s)	RAID is degraded; data is intact but the array is no longer protected should another disk fail
	Activity LED for all disks	Temperature alert
		Fan is not spinning
		The NAS is receiving its power via a connected UPS
Solid red	Activity LED for working disk(s)	Temperature alert (critical level) – the product will shut off
		Power supply has been cut and the UPS has run out of reserve power – the product will shut off
	Solid red for non-functional disk(s)	RAID has failed and data has been lost
	Off in disconnected disk(s)	Disk(s) is/are disconnected

5big NAS Pro only: When the the product is operating, a short push of the on/off button will turn the 5big NAS Pro off or, place the 5big NAS Pro into deep sleep mode if the option has been configured in NAS OS. See Eco Management for details on deep sleep mode.

5big NAS Pro only: A long push of more than four seconds will cut the power from the 5big NAS Pro, forcing it to shut down immediately. A long push is not recommended as it may result in data loss.

LaCie 2big NAS: The front LED button can be used in tandem with the ON/OFF switch to revert the device to its factory settings (see Reset to Factory Conditions: 2big NAS).

LaCie 5big NAS Pro: The front LED button can be used in tandem with the reset button on the rear of the device to launch the LaCie NAS Rescue (see LaCie NAS Rescue: 5big NAS Pro).