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2.10 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 3
Fluid Dynamic Bearing (FDB) motor acoustics
Idle*
3-Disk
23 dBA (typical)
25 dBA (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.
2.10.1 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.
2.11 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
Table 4
Radio frequency environments
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Voltage dips, interrupts
Seagate Desktop HDD Product Manual, Rev. A
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80MHz to 1,000MHz, 5 V/m,
80% AM with 1kHz sine
900MHz, 3 V/m, 50% pulse modulation @ 200Hz
± 1 kV on AC mains, ± 0.5 kV on external I/O
± 1 kV differential, ± 2 kV common,
AC mains
150kHz to 80MHz, 3 Vrms, 80% AM with 1kHz sine
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
Seek
24 dBA (typical)
25 dBA (max)
.
Table 4
Performance
level
B
A
B
B
A
C
C
C
B
Drive Specifications
Reference
standard
EN61000-4-2: 95
EN61000-4-3: 96
ENV50204: 95
EN61000-4-4: 95
EN61000-4-5: 95
EN61000-4-6: 97
EN61000-4-11: 94
14
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