Seagate ST612712DEG ユーザーズマニュアル

ST1.3 Series Product Manual, Rev. C

15

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). Discrete 
tone penalties are added to the A-weighted sound power (LW) with the following formula only when determin-
ing compliance: 

LWt(spec) == LW + 0.1Pt + 0.3 < 4.0 (Bels)
where 
LW = A-weighted sound power level
pt == Value of discrete tone penalty [==dLt-6.0 (dBA)]
dLt = Tone-to-noise ratio taken in accordance with ISO 7779.

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.

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

)

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:

1.6 bels (typ)

 

1.7 bels (max)

1.9 bels (typ)

 

2.0 bels (max)

 

 

Radiated RF immunity

80 to 1,000 MHz, 3 V/m, 

 

80% AM with 1 kHz sine

 

900 MHz, 3 V/m, 50% pulse modulation @ 200 

Hz

A

EN 61000-4-3: 96

 

ENV 50204: 95

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 sine

A

EN 61000-4-6: 97

Voltage dips, interrupts

0% open, 5 seconds

 

0% short, 5 seconds

 

40%, 0.10 seconds

 

70%, 0.01 seconds

C

 

C

 

C

 

B

EN 61000-4-11: 94