Momentus 5400.3 PSD SATA Product Manual, Rev. A
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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 la tency + average access time))
*During periods of drive idle, some offline activity may occur accordin g to the S.M.A.R .T. specifica tion, whi ch may incre ase acoustic an d
power to operational levels.
2.12 Electromag netic immunityWhen 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:
Table 5: Drive level acoustics
Models Idle* Performance seek
2 discs ST91608220AS
ST91208220AS
ST91008220AS
2.4 bels (typ)
2.6 bels (max) 3.0 bels (typ)
3.2 bels (max)
1 disc ST9808212AS
ST9608210AS 2.2 bels (typ)
2.4 bels (max) 2.9 bels (typ)
3.1 bels (max)
Table 6: Radio frequency enviro nm en t s
Test Description Performance
level Reference
standard
Electrostatic discharge Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B EN 61000-4-2: 95
Radiated RF immunity 80 t o 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 A EN 61000-4-6: 97
Power Frequency H-field
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