Seagate ST500LT033 ユーザーズマニュアル
S
EAGATE
L
APTOP
U
LTRATHIN
HDD SATA P
RODUCT
M
ANUAL
, R
EV
. A
11
D
RIVE
S
PECIFICATIONS
2.9
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°C). Emission levels are reported as the total A-weighted sound power levers for steady state, idle, and
active seeks modes of operation.
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.
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
E
LECTROMAGNETIC
I
MMUNITY
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
to the radio frequency (RF) environment as defined in
I
DLE
(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.
specification, which may increase acoustic and power to operational levels.
P
ERFORMANCE
S
EEK
2.0 bels (typ)
2.2 bels (max)
2.2 bels (typ)
2.4 bels (max)
Table 4
Radio Frequency Environments
T
EST
D
ESCRIPTION
P
ERFORMANCE
L
EVEL
R
EFERENCE
S
TANDARD
Electrostatic discharge
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
B
EN 61000-4-2: 95
Radiated RF immunity
80 to 1,000 MHz, 3 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
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