Table of Contents
Advertisement
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 6
Fluid Dynamic Bearing (FDB) motor acoustics
8TB, 6TB & 4TB models
2TB 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 7
Radio frequency environments
Specification
Electrostatic discharge
Radiated RF immunity
EFT / Burst
Surge immunity
Conducted RF immunity
Power Frequency H-field immunity
Voltage dips and interrupts
Seagate BarraCuda Pro v6 Serial ATA Product Manual, Rev. A
Idle*
2.8 bels (typ)
3.0 bels (max)
2.2 bels (typ)
2.4 bels (max)
Test method
IEC/EN 61000-4-2
IEC/EN 61000-4-3
IEC/EN 61000-4-4
IEC/EN 61000-4-5
IEC/EN 61000-4-6
IEC/EN 61000-4-8
IEC/EN 61000-4-11
Performance seek
3.2 bels (typ)
3.4 bels (max)
2.6 bels (typ)
2.8 bels (max)
Test Conditions
± 4 kV Contact / HCP, VCP / ± 8 kV Air
(minimum of 500 discharges applied)
80 -1000 MHz, 3 V/m, 80% 1 kHz AM
± 0.5 kV I/O, ± 1.0 kV AC mains
AC mains: 1.2/50 μs @ ± 2 kV common mode,
± 1 kV differential
150 kHz to 80 MHz, 3 Vrms, 80% 1 kHz AM,
AC input, DC input and I/O
1 A/m, 50/60 Hz, 3 axes, 400 gauss
>95% reduction for 0.5 cycles,
30% reduction for 25 cycles,
>95% reduction for 250 cycles
Compliance
Compliant
Compliant
Compliant
Compliant
Compliant
Compliant
Compliant
17
Advertisement
Table of Contents
