Seagate ST980811AS ユーザーズマニュアル
Momentus 5400.3 SATA Product Manual, Rev. D
13
2.11
Acoustics
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea-
surements are consistent with ISO document 7779. Sound power measurements are taken under essentially
free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.
surements are consistent with ISO document 7779. Sound power measurements are taken under essentially
free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.
Note.
For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is
defined by the following equation:
defined by the following equation:
(Number of seeks per second = 0.4 / (average latency + average access time))
*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.
2.12
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) environments defined in the following table:
performance when subjected to the radio frequency (RF) environments defined in the following table:
Table 5:
Drive level acoustics
Models
Idle*
Performance seek
2 discs
ST9160821AS
ST9120822AS
ST9100828AS
2.4 bels (typ)
2.6 bels (max)
3.0 bels (typ)
3.2 bels (max)
1 disc
ST980811AS
ST960813AS
ST940814AS
2.2 bels (typ)
2.4 bels (max)
2.9 bels (typ)
3.1 bels (max)
Table 6:
Radio frequency environments
Test
Description
Performance
level
level
Reference
standard
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
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
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
C
C
B
EN 61000-4-11: 94