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Barracuda 18FC Product Manual, Rev. B
6.4
Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).
6.4.1
Temperature
a. Operating
The MTBF specification for the drive is based on operating at a local ambient temperature of 86°F (30°C).
Occasional excursions to drive ambient temperatures of 122°F (50°C) or 41°F (5°C) may occur without
impact to specified MTBF. The enclosure for the drive should be designed such that the PCBA and case
temperatures listed in Section 8.4.1 and illustrated in Figures 8 and 9 on page 30 are not exceeded. Air flow
may be needed to achieve these temperature values. Continual or sustained operation at case tempera-
tures above these values will degrade MTBF.
The drive meets all specifications over a 41°F to 122°F (5°C to 50°C) drive ambient temperature range with
a maximum gradient of 36°F (20°C) per hour when the case temperature limits specified above are not
exceeded.
b. Non-operating
Non-operating temperature should remain between –40°F to 158°F (–40°C to 70°C) package ambient with
a maximum gradient of 36°F (20°C) per hour. This assumes that the drive is packaged in the shipping con-
tainer designed by Seagate.
6.4.2
Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 90% relative humidity with a maximum gradient of 10% per hour.
b. Non-operating
5% to 95% relative humidity with a maximum gradient of 10% per hour.
6.4.3
Effective altitude (sea level reference)
a. Operating
–1,000 to +10,000 feet (–305 to +3,048 meters)
b. Non-operating
–1,000 to +40,000 feet (–305 to +12,210 meters)
6.4.4
Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria are applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent,
it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted in a vertical
or horizontal position and in accordance with the restrictions of Section 8.4. Orientation of the side nearest the
LED may be up or down.
6.4.4.1
Shock
a. Operating (normal)
The drive, as installed for normal operation, will operate error free while subjected to intermittent shock not
exceeding 2.0 Gs at a maximum duration of 11 msec (half sinewave). Shock may be applied in the X, Y, or
Z axis.
b. Operating (abnormal)
Equipment as installed for normal operation will not incur physical damage while subjected to intermittent
shock not exceeding 10 Gs at a maximum duration of 11 msec (half sinewave). Shock occurring at abnor-
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