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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.
NOTE
Table 9 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.
Test for Prominent Discrete Tones (PDTs)
2.7.1
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.
Electromagnetic immunity
2.8
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 10Radio frequency environments
Test
Electrostatic discharge
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Voltage dips, interrupts
Seagate Exos X24 SATA Product Manual, Rev. A (Draft 1)
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
Idle*
2.8 bels (typ)
3.0 bels (max)
Description
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
80 to 1000 MHz, 3 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
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
Performance seek
3.2 bels (typ)
3.4 bels (max)
Performance level
Reference 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
C
EN 61000-4-11: 94
C
C
B
Drive specifications
23
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