LSI SATA 150 - Manual (Page 17)

Overview of Main Adapter Features 1-3
Copyright © 2002–2006 by LSI Logic Corporation. All rights reserved.
SMART-compliant physical disks have attributes for which data (values)
can be monitored to identify changes in values and determine whether
the values are within threshold limits. Many mechanical failures and
some electrical failures display some degradation in performance before
failure
There are numerous factors that relate to predictable physical disk
failures, such as a bearing failure, a broken read/write head, and
changes in spin-up rate. In addition, there are factors related to
read/write surface failure, such as seek error rate and excessive bad
sectors.
Note: See http://www.t13.org for Serial Attached ATA (SATA)
interface specifications.
1.1.4 Alarm Beep Codes
The SATA 150-4 and SATA 150-6 adapters have a speaker that
generates audible warnings when system errors or events occur. Beeps
occur at one-second intervals. The audible warnings do not require any
management software in order to work.
Table 1.1 describes the alarm
beep codes.
Table 1.1 Alarm Beep Codes
Event or Error Alarm Beep Code
A drive is offline (three beeps, one second off)
A drive is running in degraded mode (one beep, one second off)
An automatic rebuild has been completed (one beep, three seconds off)
The temperature is above or below the
acceptable range (two beeps, two seconds off)
The firmware receives a command from an
application to test the speaker (four beeps)