Duration Frequency Description
Long beep (1.5 seconds) 3 (every 5 minutes) • A power error occurred.
• The system fan is not functioning.
• The fan module has been removed.
• The NAS data cannot be copied to the
external storage device connected to the
front USB port.
2 • The storage pool is about to reach full
capacity.
• The storage pool has reached full
capacity.
• A storage pool status error occurred.
• The shared folder is about to reach its full
capacity.
• The shared folder has reached its full
capacity.
• The drives are in degraded mode.
• The drive is rebuilding.
• The USB device is being removed (USB
one-touch copy button).
• A shared folder status error occurred.
• A drive is plugged in or out.
• The iSCSI is about to reach full capacity.
1 • The NAS was powered off by force
shutdown (hardware shutdown).
• The NAS was powered on successfully
and is ready.
Long and short beeps 1 long and 2 short
beeps
The JBOD expansion unit has been removed.
TS-x77XU User Guide
Basic Operations 41
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