User Manual

Seagate Enterprise Capacity 3.5 HDD v5.1 Product Manual, Rev. C 15
2.8 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.
)
*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.
2.9 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.
2.10 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 test methods per standard EN 55024:2010.
See Table 4 below:
1
Field in Gauss at the drive envelope. Testing per procedures 20800109-349 and 20800109-350.
2
Passing Field in Gauss at the drive envelope. In practice, testing is conducted using a fixed distance from the bottom of the
magnet to the top of the drive. Calibration of the field vs. distance is done with a Hall probe with no magnetic materials present.
3
Testing to be done with magnet 0.375” dia. x 0.100” Ni-plated NdFeB; B,~11.5 kG, magnetized along its length; the magnet is
oriented with the length perpendicular to the drive cover/PCBA. Drive to be properly secured during test.
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 3 Fluid Dynamic Bearing (FDB) motor acoustics
Idle* Performance seek
All models 2.2 bels (typ)
2.4 bels (max)
2.6 bels (typ)
2.8 bels (max)
Table 4 Radio frequency environments
Specification Test method Test Conditions Compliance
Electrostatic discharge IEC/EN 61000-4-2
± 4 kV Contact / HCP, VCP /
± 8 kV Air
(minimum of 500 discharges applied)
Compliant
Radiated RF immunity IEC/EN 61000-4-3 80 -1000 MHz, 3 V/m, 80% 1 kHz AM Compliant
EFT / Burst IEC/EN 61000-4-4 ± 0.5 kV I/O, ± 1.0 kV AC mains Compliant
Surge immunity IEC/EN 61000-4-5
AC mains: 1.2/50 μs @ ± 2 kV common mode,
± 1 kV differential
Compliant
Conducted RF immunity IEC/EN 61000-4-6
150 kHz to 80 MHz, 3 Vrms, 80% 1 kHz AM,
AC input, DC input and I/O
Compliant
Power Frequency H-field immunity IEC/EN 61000-4-8 1 A/m, 50/60 Hz, 3 axes, 400 gauss Compliant
Voltage dips and interrupts IEC/EN 61000-4-11
>95% reduction for 0.5 cycles,
30% reduction for 25 cycles,
>95% reduction for 250 cycles
Compliant