Table of Contents
Advertisement
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 5:
Drive level acoustics
Models
2 discs
ST9160821AS
ST9120822AS
ST9100828AS
1 disc
ST980811AS
ST960813AS
ST940814AS
*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 6:
Radio frequency environments
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Power Frequency H-field
immunity
Voltage dips, interrupts
Momentus 5400.3 SATA Product Manual, Rev. D
Idle*
2.4 bels (typ)
2.6 bels (max)
2.2 bels (typ)
2.4 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 seek
3.0 bels (typ)
3.2 bels (max)
2.9 bels (typ)
3.1 bels (max)
Performance
level
B
A
B
B
A
A
C
C
B
Reference
standard
EN 61000-4-2: 95
EN 61000-4-3: 96
ENV 50204: 95
EN 61000-4-4: 95
EN 61000-4-5: 95
EN 61000-4-6: 97
EN 61000-4-8: 97
EN 61000-4-11: 94
13
Advertisement
Table of Contents
