Buffalo Technology TeraStation HD-HTGL/R5 - Manual (Page 69)

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. If TeraStation encounters a disk error, it will be reported in the TeraStation status on the top of any
of the Web-Based configuration screens. Run a Disk Scan.in.the.event.of.this.error...If.that.still.
does not resolve the problem, a Format is recommended. Formatting the drive will delete all of the
data on it, so back up any data you can before formatting (if possible). Finally, if none of the above
solutions help, please contact Technical Support (see pages 79 and 80 for contact information).
Troubleshooting
DIAG LED codes:
One blink every second: RAID array is operating normally
One blink every four seconds: RAID error
Four blinks every four seconds: Internal fan error
Five blinks every four seconds: Flash ROM error
Six blinks every four seconds: Hard drive error
Seven blinks every four seconds: RAM, LAN, or HDD controller error (motherboard)