Seagate ST3250310CS Acoustics emissions, Electromagnetic immunity, Radio frequency environments

2.10Acoustics emissions

Drive emission of sound is measured consistent with the ECMA-74 and its referenced standards. Testing is conducted at room temperature (approximately 25 degrees C). Emission levels are reported as the total A-weighted sound power levels for, steady state, idle and active (seek) modes of operations.

Table 3:	Drive A-weighted Sound Power Levels (SWL, BA)
		Idle[1]	CE seek profile
250 GB model		2.5 bels (typ)	2.6 bels (typ)
		2.8 bels (max)	2.8 bels (max)

[1]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)

Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this pro- cess is the use of the absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* 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.

* Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.

2.11Electromagnetic 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 4:	Radio frequency environments
Test		Description	Performance level	Reference standard
Electrostatic		Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV	B	EN 61000-4-2: 95
discharge
Radiated RF		80 to 1,000 MHz, 3 V/m,	A	EN 61000-4-3: 96
immunity		80% AM with 1 kHz sine		ENV 50204: 95
		900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast		± 1 kV on AC mains, ± 0.5 kV on external I/O	B	EN 61000-4-4: 95
transient
Surge immunity		± 1 kV differential, ± 2 kV common, AC mains	B	EN 61000-4-5: 95
Conducted RF		150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine	A	EN 61000-4-6: 97
immunity
Voltage dips,		0% open, 5 seconds	C	EN 61000-4-11: 94
interrupts		0% short, 5 seconds	C
		40%, 0.10 seconds	C
		70%, 0.01 seconds	B

DB35.4 Series SATA Product Manual, Rev. B 13