Acoustics; Electromagnetic Immunity - Seagate ST9100822A - Momentus 4200.2 100 GB Hard Drive Product Manual

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)
Table 4: Drive level acoustics
Acoustic mode
Idle* Quiet Seek
2.4 bels (typ) 2.6 bels (typ)
2.6 bels (max) 2.8 bels (max)
*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:
Table 5: Electromagnetic immunity
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Power Frequency H-field
immunity
Voltage dips, interrupts
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.
Momentus 4200.2 Product Manual, Rev. D
Performance Seek
2.9 bels (typ)
3.1 bels (max)
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 2,000 MHz, 10 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
Performance Reference
level standard
B EN 61000-4-2: 95
A EN 61000-4-3: 96
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 EN 61000-4-11: 94
C
B
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