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2.9
Acoustics
Drive emission of sound is measured consistent with the ECMA-74 and its referenced standards. Testing is conducted at room temperature
(approximately 25°C). Emission levels are reported as the total A-weighted sound power levers for steady state, idle, and active seeks modes of
operation.
Table 6
Drive A-weighted Sound Power Levels (SWL, BA)
(1)
Idle
2.0 bels (typ)
2.2 bels (max)
1.
During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may
increase acoustic and power to operational levels.
2.9.1
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 the lower limit for the threshold curve* 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.
*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.
2.10
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) environment as defined in
Table 7
Radio Frequency Environments
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Power Frequency H-field
immunity
Voltage dips, interrupts
2.11
Reliability
2.11.1 Annualized Failure Rate (AFR)
The product will achieve an Annualized Failure Rate (AFR) of 0.55% when operated in an environment of ambient air temperatures of 25°C.
Operation at temperatures outside the specifications in
population statistics that is not relevant to individual units.
AFR specifications are based on the following assumptions for consumer electronics 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
• Normal I/O duty cycle for consumer electronics environments. Operation at excessive I/O duty cycle may degrade product reliability.
Seagate Video 2.5 HDD Product Manual, Rev. J (Draft 1)
Performance Seek
2.2 bels (typ)
2.4 bels (max)
Table
7.
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1GHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
± 1 kV on AC mains, ± 0.5 kV on external I/O
± 1 kV differential, ± 2 kV common, AC mains
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine
1 A/m, 50Hz/60Hz, 3 axes
30% Reduction for 25 cycles
>95% Reduction for 250 cycles
>95%, 0.5 cycles
Section 2.8, Environmental Specifications
Section 2.8, Environmental Specifications
Performance
Reference
Level
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
A
EN 61000-4-8: 97
C
C
EN 61000-4-11: 94
B
may increase the product AFR. AFR is a
may reduce the product reliability.
Drive Specifications
14
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