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2.8.2.2
Nonoperating vibration
The maximum nonoperating vibration levels that the drive may experience without incurring physical damage or degradation in
performance when subsequently put into operation are specified below.
5–500 Hz
5.0 Gs (0 to peak). Max displacement may apply below 22 Hz.
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 and active
seeks modes of operation.
Table 6
Drive A-weighted Sound Power Levels (SWL, BA)
MODELS
ST500VT000, ST320VT000
and ST250VT000
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
E
LECTROMAGNETIC
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
T
EST
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Power Frequency H-field
immunity
Voltage dips, interrupts
S
V
2.5 HDD P
EAGATE
IDEO
I
DLE
2.0 bels (typ)
2.2 bels (max)
I
MMUNITY
Table 7
D
ESCRIPTION
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1,000 MHz, 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
M
, R
. F
RODUCT
ANUAL
EV
(1)
P
ERFORMANCE
2.2 bels (typ)
2.4 bels (max)
.
D
RIVE
S
EEK
P
R
ERFORMANCE
EFERENCE
L
S
EVEL
TANDARD
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
S
PECIFICATIONS
10
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