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.
1.1.4Alarm 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 | (two beeps, two seconds off) |
acceptable range | |
| |
The firmware receives a command from an | (four beeps) |
application to test the speaker | |
| | |
Overview of Main Adapter Features | 1-3 |
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