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12 Lyrion Series IDE Product Manual, Rev. F
2.8.6.4 Nonoperating random vibration
The test consists of 15 minutes of random vibration using the power spectral density (PSD) levels specified in
the table below. The vibration test level is 3.01 Gs RMS. The drive does not incur any physical damage when
subsequently put into operation.
2.8.7 Corrosive environment
Seagate electronic drive components pass accelerated corrosion testing equivalent to ten years of exposure to
light industrial environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM
B845. However, this accelerated testing cannot duplicate every potential application environment.
Users should use caution exposing any electronic components to uncontrolled chemical pollutants and corro-
sive chemicals as electronic drive component reliability can be affected by the installation environment. The sil-
ver, copper, nickel and gold films used in Seagate products are especially sensitive to the presence of sulfide,
chloride, and nitrate contaminants. Sulfur is found to be the most damaging. In addition, electronic components
should never be exposed to condensing water on the surface of the printed circuit board assembly (PCBA) or
exposed to an ambient relative humidity greater than 95 percent. Materials used in cabinet fabrication, such as
vulcanized rubber, that can outgas corrosive compounds should be minimized or eliminated. The useful life of
any electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.
2.9 Acoustics
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 at each octave band.
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.
)
Table 5: Nonoperating random vibration profile.
Frequency (Hz) G
2
/Hz
2.5 1.0 x E-03
5 3.0 x E-02
40 1.8 x E-02
500 1.8 x E-02
Table 6: Drive level acoustics
Acoustic mode
Idle Operational
1.6 bels (typ) 2.2 bels (typ)