Status Description
Red • A drive is invalid.
• A disk volume has reached its full capacity.
• A disk volume is about to reach its full capacity.
• A 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.
Flashes red every 0.5
seconds
The device is in degraded mode (one member drive failed in RAID 1, RAID 5, or
RAID 6).
Green The device is ready.
Flashes green every 0.5
seconds
• The device is not congured.
• A drive is not formatted.
Flashes orange The device is in sleep mode.
O • All drives are in standby mode.
• The device is powered o.
Drive LED
Status Description
Flashes red Data is being accessed, and during the process a drive read/write error
occurred.
Red A drive read/write error occurred.
Flashes green Data is being accessed.
Green The drive is ready.
O No drive was detected.
LAN LED
Status Description
Orange The network connection is operating.
Flashes orange The device is being accessed from the network.
O The device is not connected to a network.
2.5 Gigabit Ethernet Speed LED
Status Description
Green The network connection is operating at 2.5 Gbps.
Orange The network connection is operating at 1 Gbps or 100 Mbps.
TS-855eU User Guide
Basic Operations 47
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