Constellation CS Serial ATA Product Manual, Rev. C
19
www.seagate.com
2.13
Reliability
2.13.1
Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)
The product shall achieve an Annualized Failure Rate (AFR) of 1.1% (MTBF of 800 thousand hours) when operated at
nominal power and typical case temperatures of 40°C. Operation at temperatures outside the specifications 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 business critical storage system environments:
•
8760 power-on-hours per year.
•
Operations at nominal voltages.
•
Temperatures outside the specifications in Section 2.9 may reduce the product reliability.
•
A workload rate below the average annualized specified limits. 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.
2.14
Agency certification
2.14.1
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.
2.14.2
Electromagnetic compatibility
Hard drives that display the CE mark comply with the European Union (EU) requirements specified in the Electromagnetic
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
14
bits read, max
Annualized Failure Rate (AFR)
1.1% (nominal power, 40°C case temperature)
Load unload cycles
300,000 cycles
Rated Workload
Average rate of <180TB/year
The MTBF specification for the drive assumes the I/O workload does not exceed the Average
Annualized Workload Rate Limit of <180TB/year. Workloads exceeding the annualized rate may
degrade the drive MTBF and impact product reliability. The Average Annualized Workload Rate Limit
is in units of TB per year, or TB per 8760 power on hours.
Workload Rate = TB transferred x ( 8760 / recorded power on hours).
Warranty
To determine the warranty for a specific drive, use a web browser to access the following web page:
http://www.seagate.com/support/warranty-and-returns/
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.
