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2.10
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)
5-disk models
4-disk models
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.
2.10.1
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 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.
2.11
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) environment as defined in Table 7.
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
Seagate BarraCuda Product Manual, Rev. J
1
Performance Seek
Idle
2.7 bels (typ)
2.6 bels (typ)
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1GHz, 3 V/m,
80% AM with 1 kHz sine
± 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
2.9 bels (typ)
2.7 bels (typ)
Performance
Reference
Criteria
Standard
B
EN 61000-4-2: 95
EN 61000-4-3: 96
A
B
EN 61000-4-4: 95
B
EN 61000-4-5: 95
A
EN 61000-4-6: 97
EN 61000-4-8: 97
A
C
EN 61000-4-11: 94
C
B
14
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