LED Status Indicators

Use the 4big’s front and rear LEDs and the chart below as a reference to determine the status of your 4big:

If the front LED is:	And the rear LED is:	And the RAID mode is:	Then:
Solid blue	Blinking blue	All	The 4big is working properly, only active disks’ LEDs blink.
Solid blue	Blinking red	All	One or more errors have been detected on the drive, but while it is still functional, replacing it is recommended.
Blinking blue	Blinking blue	All	The 4big is starting up; front LED and LEDs of functional disks become solid blue when initialized.
Dimming blue (5s)¹	Off	All	The 4big is in standby mode. If the power switch is set to “auto” the 4big will enter standby when your computer is either off or in standby. If rebuilding has begun, the process will finish before the 4big can enter standby. After 30 minutes of standby, the LED will switch off.
Alternating long blue and short red:	Three disks are blinking blue, while one disk is blinking 3 blue, 1 red:	RAID 10, 3, 5, 3+/5+	RAID is rebuilding.
Alternating long blue and short red:	Solid red (failed disks) and solid blue (functional disks)	RAID 10, 3, 5, 5+	One drive has failed or was improperly inserted; RAID is functional but the security of the drives has been compromised.
Solid red	Solid red (failed disks) and solid blue (functional disks)	RAID 0, concatenation	One or more drives have failed or are improperly inserted; RAID is not functional.
Solid red	Solid red (failed disks) and solid blue (functional disks)	10, 3, 5, 3+/5+	Two or more drives have failed or are improperly inserted; RAID is not functional.
Blinking blue/red	Normal LED activity	All	Temperature alert; allow the 4big to finish current processes and then shut it down. Make sure the ventilation holes on the back of the 4big are not obstructed and that there is ample room for airflow around the unit. Allow the 4big to cool before turning it back on.
Dimming red (5s)¹	Off	All	During standby mode, when one or more drives have failed or are improperly inserted; RAID is not functional. Dimmed LED stays on for 30 minutes.
Dimming red (5s)¹	Off	All	Temperature critical; LaCie recommends that following this event you leave the 4big in standby for at least an hour before restarting to prevent damage to the disks.
Off	Off	All	The 4big is either turned off, or has been in standby mode for more than 30 minutes, or system or electronic board failure; in this case, contact LaCie customer support.