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20 Video 3.5 HDD Product Manual, Rev. H
Drive Specifications www.seagate.com
2.10 Acoustics
Table 4 Fluid Dynamic Bearing (FDB) motor acoustics
Model
2.1 bels (typ)
2.3 bels (max)
2.3 bels (typ)
2.4 bels (max)
1.9 bels (typ)
2.1 bels (max)
2.2 bels (typ)
2.3 bels (max)
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.
*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 the following table:
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)
Idle* Seek
ST2000VM003
ST1000VM002
Table 5 Radio frequency environments
Test Description Performance Level Reference standard
Electrostatic
discharge
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B
EN61000-4-2: 95
Radiated RF
immunity
80MHz to 1,000MHz, 3 V/m,
80% AM with 1kHz sine
900MHz, 3 V/m, 50% pulse modulation @ 200Hz
A
EN61000-4-3: 96
ENV 50204: 95
Electrical fast
transient
± 1 kV on AC mains, ± 0.5 kV on external I/O B
EN61000-4-4: 95
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains B EN61000-4-5: 95
Conducted RF
immunity
150kHz to 80MHz, 3 Vrms, 80% AM with 1kHz
sine
A
EN61000-4-6: 97
Voltage dips,
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN61000-4-11: 94