Seagate ST960813AS, ST980811AS manual Acoustics, Electromagnetic immunity, Drive level acoustics

2.11Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea- surements 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. 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 5:	Drive level acoustics
Models			Idle*	Performance seek
2 discs		ST9160821AS	2.4 bels (typ)	3.0 bels (typ)
		ST9120822AS	2.6 bels (max)	3.2 bels (max)
		ST9100828AS
1 disc		ST980811AS	2.2 bels (typ)	2.9 bels (typ)
		ST960813AS	2.4 bels (max)	3.1 bels (max)
		ST940814AS

*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.

2.12Electromagnetic 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 6:	Radio frequency environments
			Performance	Reference
Test		Description	level	standard
Electrostatic discharge		Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV	B	EN 61000-4-2: 95
Radiated RF immunity		80 to 2,000 MHz, 10 V/m,	A	EN 61000-4-3: 96
		80% AM with 1 kHz sine		ENV 50204: 95
		900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast transient		± 1 kV on AC mains, ± 0.5 kV on external I/O	B	EN 61000-4-4: 95
Surge immunity		± 1 kV differential, ± 2 kV common, AC mains	B	EN 61000-4-5: 95
Conducted RF immunity		150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz	A	EN 61000-4-6: 97
		sine
Power Frequency H-field		1 A/m, 50Hz/60Hz, 3 axes	A	EN 61000-4-8: 97
immunity
Voltage dips, interrupts		30% Reduction for 25 cycles	C	EN 61000-4-11: 94
		>95% Reduction for 250 cycles	C
		>95%, 0.5 cycles	B

Momentus 5400.3 SATA Product Manual, Rev. D 13