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2.10.1 Test for Prominent Discrete Tones (PDTs)
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process
is the use of the absolute threshold of hearing. Seagate uses this threshold curve (originated in ISO 389-7) to
discern tone audibility and to compensate for the inaudible components of sound prior to computation of tone ratios
according to Annex D of the ECMA-74 standards.
2.11 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
Table 5 Radio frequency environments
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Voltage dips, interrupts
2.12
MTBF and Warranty
Bare drive warranty terms - 3-year coverage
The product will achieve a Mean Time Between Failure (MTBF) of 1,000,000 hours when operated in an
environment of ambient air temperatures of 25°C. Operation at temperatures outside the specifications shown in
Environmental specifications
not relevant to individual units.
MTBF specifications are based on the following assumptions for Surveillance environments:
• 8760 power-on-hours per year
• 10,000 average motor start/stop cycles per year
• Operations at nominal voltages
• Temperatures outside the specifications in
reliability.
• Normal I/O duty cycle for consumer electronics environments. Operation at excessive I/O duty cycle may
degrade product reliability.
The Surveillance environment of power-on-hours, temperature, and I/O duty cycle affect the product MTBF. The
MTBF will be degraded if used in an enterprise application.
Seagate NAS HDD +SRS Product Manual, Rev. C
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80MHz to 1,000MHz, 3 V/m,
80% AM with 1kHz sine
900MHz, 3 V/m, 50% pulse modulation @
200Hz
± 1 kV on AC mains, ± 0.5 kV on external I/O
± 1 kV differential, ± 2 kV common,
AC mains
150kHz to 80MHz, 3 Vrms, 80% AM with 1kHz
sine
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
on page 12 may decrease the product MTBF. MTBF is a population statistics that is
Environmental specifications
Drive Specifications
Table 5
.
Performance
Reference
level
standard
B
EN61000-4-2: 95
A
EN61000-4-3: 96
ENV50204: 95
B
EN61000-4-4: 95
B
EN61000-4-5: 95
A
EN61000-4-6: 97
C
EN61000-4-11: 94
C
C
B
on page 12 may reduce the product
15
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