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DiamondMax 21 Serial ATA Product Manual, Rev. A
23
2.12 Reliability
2.12.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)
The product shall achieve an Annualized Failure Rate (AFR) of 0.34% (MTBF of 0.7 million hours) when oper-
ated in an environment of ambient air temperatures of 25°C. Operation at temperatures outside the specifica-
tions in Section 2.9 may increase the product AFR (decrease MTBF). AFR and MTBF are population statistics
that are not relevant to individual units.
AFR and MTBF specifications are based on the following assumptions for desktop personal computer environ-
ments:
• 2400 power-on-hours per year.
• 10,000 average motor start/stop cycles per year.
• Operations at nominal voltages.
• Temperatures outside the specifications in Section 2.9 may reduce the product reliability.
• Normal I/O duty cycle for desktop personal computers. Operation at excessive I/O duty cycle may degrade
product reliability.
The desktop personal computer environment of power-on-hours, temperature, and I/O duty cycle affect the
product AFR and MTBF. The AFR and MTBF will be degraded if used in a enterprise application.
2.13 Agency certification
2.13.1 Safety certification
The drives are recognized in accordance with UL 1950 and CSA C22.2 (950) and meet all applicable sections
of IEC950 and EN 60950.
2.13.2 Electromagnetic compatibility
Hard drives that display the CE mark comply with the European Union (EU) requirements specified in the Elec-
tromagnetic Compatibility Directive (89/336/EEC). Testing is performed to the levels specified by the product
standards for Information Technology Equipment (ITE). Emission levels are defined by EN 55022, Class B and
the immunity levels are defined by EN 55024.
Drives are tested in representative end-user systems. Although CE-marked drives comply with the directives
when used in the test systems, we cannot guarantee that all systems will comply with the directives. The drive
is designed for operation inside a properly designed enclosure, with properly shielded I/O cable (if necessary)
and terminators on all unused I/O ports. Computer manufacturers and system integrators should confirm EMC
compliance and provide CE marking for their products.
Nonrecoverable read errors 1 per 10
14
bits read, max
Annualized Failure Rate (AFR) 0.34% (nominal power, 25°C ambient temperature)
Contact start-stop cycles 50,000 cycles
(at nominal voltage and temperature, with 60 cycles per hour and a 50% duty cycle)
Warranty 3 years on distribution units.
Preventive maintenance None required.