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2.12Reliability
2.12.1Annualized 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 2.8 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
•Operations at nominal voltages.
•Temperatures outside the specifications in Section 2.8 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
Nonrecoverable read errors | 1 per 1014 bits read, max |
Annualized Failure Rate (AFR) | 1.1% (nominal power, 40°C case temperature) |
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Load unload cycles | 300,000 cycles |
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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). |
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Warranty | To determine the warranty for a specific drive, use a web browser to access the following web page: |
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| 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. |
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Preventive maintenance | None required. |
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Seagate Terascale HDD Product Manual, Rev. B | 15 |
