Seagate Video 2.5 HDD Product Manual, Rev. J (Draft 1)
14
Drive Specifications
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.
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
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
Section 2.8, Environmental Specifications
may increase the product AFR. AFR is a
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
Section 2.8, Environmental Specifications
may reduce the product reliability.
• Normal I/O duty cycle for consumer electronics environments. Operation at excessive I/O duty cycle may degrade product reliability.
Table 6
Drive A-weighted Sound Power Levels (SWL, BA)
Idle
(1)
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
.
Performance Seek
2.0 bels (typ)
2.2 bels (max)
2.2 bels (typ)
2.4 bels (max)
Table 7
Radio Frequency Environments
Test
Description
Performance
Level
Reference
Standard
Electrostatic discharge
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
B
EN 61000-4-2: 95
Radiated RF immunity
80 to 1GHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
A
EN 61000-4-3: 96
ENV 50204: 95
Electrical fast transient
± 1 kV on AC mains, ± 0.5 kV on external I/O
B
EN 61000-4-4: 95
Surge immunity
± 1 kV differential, ± 2 kV common, AC mains
B
EN 61000-4-5: 95
Conducted RF immunity
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine
A
EN 61000-4-6: 97
Power Frequency H-field
immunity
1 A/m, 50Hz/60Hz, 3 axes
A
EN 61000-4-8: 97
Voltage dips, interrupts
30% Reduction for 25 cycles
>95% Reduction for 250 cycles
>95%, 0.5 cycles
C
C
B
EN 61000-4-11: 94
