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20 Constellation ES Serial ATA Product Manual, Rev. F
3.13 Reliability
3.13.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)
The product shall achieve an Annualized Failure Rate (AFR) of 0.73% (MTBF of 1.2 million hours) when oper-
ated nominal power and typical case temperatures of 40°C. Operation at temperatures outside the specifica-
tions in Section 3.9 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 business critical storage system
environments:
• 8,760 power-on-hours per year.
• Operations at nominal voltages.
• Temperatures outside the specifications in Section 3.9 may reduce thee product reliability.
• Normal I/O duty cycle for enterprise nearline applications. Operation at excessive I/O duty cycle may
degrade product reliability.
The enterprise application nearline environment of power-on-hours, temperature, and I/O duty cycle affect the
product AFR and MTBF.
3.14 Agency certification
3.14.1 Safety certification
These products are certified to meet the requirements of UL60950-1, CSA60950-1 and EN60950 and so
marked as to the certify agency.
3.14.2 Electromagnetic compatibility
Hard drives that display the CE mark comply with the European Union (EU) requirements specified in the Elec-
tromagnetic Compatibility Directive (2004/108/EC) as put into place 20 July 2007. 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 Seagate 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
15
bits read, max
Annualized Failure Rate (AFR) 0.73% (nominal power, 40°C case temperature)
Load unload cycles 300,000 cycles
Warranty To determine the warranty for a specific drive, use a web browser to access the
following web page: support.sea
gate.com/customer/warranty_validation.jsp
From this page, click on the "Verify Your Warranty" link. You will be asked to provide
the drive serial number, model number (or part number) and country of purchase.The
system will display the warranty information for your drive.
Preventive maintenance None required.