Seagate ST9120315AS ユーザーズマニュアル
M
OMENTUS
5400.6 SATA P
RODUCT
M
ANUAL
, R
EV
. G
17
2.11
A
COUSTICS
Drive emission of sound is measured consistent with the ECMA-74 and its’ referenced standards. Testing is conducted at
room temperature (approximately 25
room temperature (approximately 25
°
C). Emission levels are reported as the total A-weighted sound power levels for steady
state, idle, and active seek modes of operation.
*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.
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.
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.
2.12
E
LECTROMAGNETIC 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:
when subjected to the radio frequency (RF) environments defined in the following table:
Table 7
Drive A-weighted Sound Power Levels (SWL, BA)
I
DLE
*
P
ERFORMANCE SEEK
ST9500325AS, ST9500325ASG,
ST9320325AS, ST9320325ASG,
ST9250315AS, ST9250315ASG,
ST9160314AS, ST9160314ASG,
ST9120315AS, ST9120315ASG,
ST980313AS, ST980313ASG
ST9320325AS, ST9320325ASG,
ST9250315AS, ST9250315ASG,
ST9160314AS, ST9160314ASG,
ST9120315AS, ST9120315ASG,
ST980313AS, ST980313ASG
ST9500325AS, ST9500325ASG,
ST9320325AS, ST9320325ASG,
ST9250315AS, ST9250315ASG,
ST9160314AS, ST9160314ASG
ST9320325AS, ST9320325ASG,
ST9250315AS, ST9250315ASG,
ST9160314AS, ST9160314ASG
ST9120315AS, ST9120315ASG,
ST980313AS, ST980313ASG
ST980313AS, ST980313ASG
2.4 bels (typ)
2.6 bels (max)
2.6 bels (max)
2.6 bels (typ)
2.7 bels (max)
2.7 bels (max)
2.5 bels (typ)
2.6 bels (max)
2.6 bels (max)
Table 8
Radio frequency environments
T
EST
D
ESCRIPTION
P
ERFORMANCE
LEVEL
R
EFERENCE
STANDARD
Electrostatic discharge
Contact, HCP, VCP:
± 4
kV; Air:
± 8 kV
B
EN 61000-4-2: 95
Radiated RF immunity
80 to 2,000 MHz, 10 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
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
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
sine
A
EN 61000-4-6: 97
Power Frequency H-field
immunity
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
>95% Reduction for 250 cycles
>95%, 0.5 cycles
C
C
B
C
B
EN 61000-4-11: 94