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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 production disk drive shall achieve an annualized failure-rate of 0.44% (MTBF of 2,000,000 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
• Typical workload
• 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.
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.
Nonrecoverable read errors
Load unload cycles
Maximum Rated Workload
Warranty
Preventive maintenance
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.
The drive motor must come to a complete stop prior to changing the
Caution
plane of operation. This time is required to insure data integrity.
Seagate Enterprise Capacity 3.5 HDD v4 SAS Product Manual, Rev. B
15
1 per 10
bits read, max
600,000 cycles
Maximum rate of <550TB/year
Workloads exceeding the annualized rate may degrade the drive MTBF and impact prod-
uct reliability. The Annualized Workload Rate is in units of TB per year, or TB per 8760
power on hours. Workload Rate = TB transferred * (8760 / recorded power on hours).
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.
None required.
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