Seagate ST3250823ACE, ST3200826ACE Acoustics, Electromagnetic immunity, Nonoperating vibration

2.8.6.2Nonoperating vibration

The following table lists the maximum nonoperating vibration that the drive may experience without incurring physical damage or degradation in performance when subsequently put into operation.

5–22 Hz	0.25 G
22–350 Hz	5.0 Gs

2.9Acoustics

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 4:	Operating acoustics
Acoustic mode
Models		Idle	Operational
ST3400832ACE		2.6 bels (typ)	2.8 bels (typ)
		2.8 bels (max)	3.0 bels (max)
ST3300831ACE		2.4 bels (typ)	2.8 bels (typ)
ST3250823ACE		2.7 bels (max)	3.0 bels (max)
ST3200826ACE

2.10Electromagnetic 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 5:	Radio frequency environments
			Performance	Reference
Test		Description	level	standard
Electrostatic discharge		Contact, HCP, VCP: ± 4 kV; Air:	B	EN 61000-4-2: 95
		± 8 kV
Radiated RF immunity		80 to 1,000 MHz, 3 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	B	EN 61000-4-4: 95
		external I/O
Surge immunity		± 1 kV differential, ± 2 kV com-	B	EN 61000-4-5: 95
		mon, AC mains
Conducted RF immunity		150 kHz to 80 MHz, 3 Vrms,	A	EN 61000-4-6: 97
		80% AM with 1 kHz sine

DB35 Series Product Manual, Rev. B 11