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2.7
Acoustics
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All measurements 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.
For seek mode tests, the drive is placed in seek mode only. The number of
seeks per second is defined by the following equation:
Note
(Number of seeks per second = 0.4 / (average latency + average access time
)
Table 5 Fluid Dynamic Bearing (FDB) motor acoustics
All models
*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.
2.8
Test for Prominent Discrete Tones (PDTs)
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process is the use
of the absolute threshold of hearing. Seagate uses this threshold curve (originated in ISO 389-7) to discern tone audibility and
to compensate for the inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-
74 standards.
2.9
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
Description
Electrostatic discharge
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1000 MHz, 3 V/m,
Radiated RF immunity
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast transient
± 1 kV on AC mains, ± 0.5 kV on external I/O
Surge immunity
± 1 kV differential, ± 2 kV common, AC mains
Conducted RF immunity 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A
0% open, 5 seconds
0% short, 5 seconds
Voltage dips, interrupts
40%, 0.10 seconds
70%, 0.01 seconds
Seagate Enterprise Capacity 3.5 HDD v4 Serial ATA Product Manual, Rev. C
Idle*
2.8 bels (typ)
3.0 bels (max)
Performance seek
3.2 bels (typ)
3.4 bels (max)
Performance level
B
A
B
B
C
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 61000-4-11: 94
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