LED Status Description
System Status Flashes green and red
alternately every 0.5
seconds
• The drive is being formatted.
• The device is being initialized.
• The operating system is being updated.
• RAID rebuilding is in progress.
• Online RAID Capacity Expansion is in progress.
• Online RAID Level Migration is in progress.
• The firmware is being updated.
Important
When updating the firmware, do not remove
the power cable or USB cable, and do not
force-exit the application.
Red • The drive is invalid.
• The disk volume has reached its full capacity.
• The disk volume is about to reach its full capacity.
• The system fan is not functioning.
• An error occurred when accessing (read/write) the
data.
• A bad sector is detected on the hard drive.
• The device is in degraded read-only mode (two
member drives failed in RAID 5 or RAID 6 but the data
can still be read).
• A hardware self-test error occurred.
• The system temperature is over the threshold.
Flashes red every 0.5
seconds
The NAS is in degraded mode (one member drive failed in
RAID 1).
Flashes green every 0.5
seconds
• The device is starting up.
• The device is not configured.
• A drive is not formatted.
Flashes green every 2
seconds
All drives are in standby mode.
Flashes green every second The device is not configured.
Green The device is ready.
Off • All drives are in standby mode.
• The device is powered off.
LAN Orange A read/write error occurred while another device is
accessing data.
Flashes orange The device is being accessed from the network.
TS-451DeU User Guide
Basic Operations 34
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