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SEAGATE ENTERPRISE CAPACITY 3.5 HDD V4 SAS PRODUCT MANUAL, REV. A 14
5.2 RELIABILITY AND SERVICE
Users can enhance the reliability of Enterprise Capacity 3.5 HDD v4 disk drives by ensuring that the drive receives adequate cooling.
Section 6.0 provides temperature measurements and other information that may be used to enhance the service life of the drive. Section
10.2 provides recommended air-flow information.
5.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)
The product shall achieve an AFR of 0.63% (MTBF of 1,400,000 hours) over a 5 year service life when used in Enterprise Storage field
conditions as limited by the following:
• 8760 power-on hours per year.
• HDA temperature as reported by the drive <= 40°C
• Ambient wet bulb temp <= 26°C
• The AFR (MTBF) is a population statistic not relevant to individual units
• ANSI/ISA S71.04-2013 G2 classification levels and dust contamination to ISO 14644-1 Class 8 standards (as measured at
the device)
The MTBF specification for the drive assumes the operating environment is designed to maintain nominal drive temperature and humidity.
The rated MTBF is based upon a sustained drive temperature of up to 122°F (40°C) and wet bulb temperature up to 78.8°F (26°C).
Occasional excursions in operating conditions between the rated MTBF conditions and the maximum drive operating conditions may occur
without significant impact to the rated MTBF. However continual or sustained operation beyond the rated MTBF conditions will degrade the
drive MTBF and reduce product reliability.
5.2.2 Hot plugging the drive
When a disk is powered on by switching the power or hot plugged, the drive runs a self test before attempting to communicate on its’
interfaces. When the self test completes successfully, the drive initiates a Link Reset starting with OOB. An attached device should
respond to the link reset. If the link reset attempt fails, or any time the drive looses sync, the drive initiated link reset. The drive will initiate
link reset once per second but alternates between port A and B. Therefore each port will attempt a link reset once per 2 seconds assuming
both ports are out of sync.
If the self-test fails, the drive does not respond to link reset on the failing port.
It is the responsibility of the systems integrator to assure that no temperature, energy, voltage hazard, or ESD potential hazard is
presented during the hot connect/disconnect operation. Discharge the static electricity from the drive carrier prior to inserting it into the
system.
Nonrecoverable read errors 1 per 10
15
bits read, max
Annualized Failure Rate (AFR) 0.63% (nominal power, 40°C case temperature)
Load unload cycles 600,000 cycles
Rated Workload Average rate of <550TB/year
The MTBF specification for the drive assumes the I/O workload does not exceed the
Average Annualized Workload Rate Limit of <550TB/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-replacements/.
From this page, click on the “Check to see if the drive is under Warranty” link. The follow-
ing are required to be provided: the drive serial number, model number (or part number)
and country of purchase. The system will display the warranty information for the drive.
Preventive maintenance None required.
CAUTION
The drive motor must come to a complete stop prior to changing the
plane of operation. This time is required to insure data integrity.