Electromagnetic Immunity; Reliability; Annualized Failure Rate (Afr) And Mean Time Between Failures (Mtbf) - Seagate Exos 512N Product Manual

2.9

Electromagnetic immunity

When properly installed in a representative host system, the drive operates without errors or degradation in performance when
subjected to the radio frequency (RF) environments defined in the following table:
Table 6 Radio frequency environments
Test Description
Electrostatic discharge Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1000 MHz, 3 V/m,
Radiated RF immunity 80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast transient ± 1 kV on AC mains, ± 0.5 kV on external I/O
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains
Conducted RF immunity 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine
0% open, 5 seconds
0% short, 5 seconds
Voltage dips, interrupts
40%, 0.10 seconds
70%, 0.01 seconds
2.10

Reliability

2.10.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (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
(command controlled)
Maximum Rated Workload
Warranty
Preventive maintenance
Seagate Exos 7E8 SATA Product Manual, Rev. C
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 product
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 "Is my Drive under Warranty" link. The following 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.
Performance level Reference standard
B EN 61000-4-2: 95
EN 61000-4-3: 96
A
ENV 50204: 95
B EN 61000-4-4: 95
B EN 61000-4-5: 95
A EN 61000-4-6: 97
C
C
EN 61000-4-11: 94
C
B
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