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Momentus 5400.3 PATA Blade Server Product Manual, Rev. B
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.
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:
(Number of seeks per second = 0.4 / (average latency + average access time)
*During periods of drive i dle, some offline activity may occur accord in g t o t he S.M .A. R. T. speci ficati on , w hich ma y increase acoustic and
power to operational levels.
2.12 El ectromagnetic immuni ty
When properly installed in a representative host system, the drive operates without errors or degradation in
performance when subjected to the rradio frequency (RF) environments defined in the following table:
A - 1) No upset or degradation in performance beyond manufacturer’s specified limits.
2) No data loss.
B - 1) Unit self recovers without user intervention.
2) No data loss.
C -1) Upset OK provided that unit will function after user intervention.
Table 3: Drive level acoustics
Models Idle* Normal Seek Performance Seek
2 Discs ST9160821AB
ST9120822AB
ST9100828AB
2.4 bels (typ)
2.6 bels (max) 2.6
2.8 3.0 bels (typ)
3.2 bels (max)
1 Disc ST980815AB
ST960815AB
ST9402116AB
2.2 bels (typ)
2.4 bels (max) 2.5
2.7 2.9 bels (typ)
3.1 bels (max)
Table 4: Electromagnetic immunity
Test Description Performance
level Reference
standard
Electrostatic discharge Contact, HCP, VCP: ± 4 kV; Air: ± 8 k V BEN 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
AEN 61000-4-3: 96
ENV 50204: 95
Electrical fast transient ± 1 kV on AC mains, ± 0.5 kV on external I/O BEN 61000-4-4: 95
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains BEN 61000-4-5: 95
Conducted RF immunity 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz
sine AEN 61000-4-6: 97
Power Frequency H-field
immunity 1 A/m, 50Hz/60Hz, 3 axes AEN 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