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36
7.3
7.4
7.4.1
7.4.2
Heat/power dissipation
The heat and power dissipation values for your drive are listed below.
Typical seek and read power dissipation*
Typical power dissipation under
idle conditions
Typical seek and read power dissipation*
Typical power dissipation under
idle conditions
*DC power average at nominal voltages
Environmental limits
Temperature and humidity must not cause condensation within the drive.
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).
Temperature
a. Operating
The MTBF specification for the drive is based on operating at a local
ambient temperature of 95°F (35°C). Occasional excursions to drive
ambient temperatures of 122°F (50°C) may occur without impact to
specified MTBF. The enclosure for the drive should be designed such that
the temperatures at the locations specified in Section 6.2.2 are not
exceeded. Air flow may be needed to achieve these temperatures.
Continual or sustained operation at case temperatures above these
values may degrade MTBF.
The drive meets all specifications within a 41° to 122°F (5° to 50°C)
drive ambient temperature range with a maximum gradient of
36°F (20°C) per hour.
b. Non-operating
Non-operating temperature should remain between –40° to 158°F (–40°
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
container designed by Seagate.
Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% relative humidity with a maximum gradient of 10% per hour
b. Non-operating
5% to 95% relative humidity
Barracuda 2LP Product Manual, Rev. D
ST31250
N/W/WC
11W
(35 BTUs/hr)
9W
(31 BTU/hr)
ST32550
N/W/WC
11W
(35 BTUs/hr)
9W
(31 BTUs/hr)
ST31250
ND/WD/DC
12W
(41 BTUs/hr)
9W
(31 BTUs/hr)
ST32550ND
ND/WD/DC
12W
(41 BTUs/hr)
9W
(31 BTUs/hr)
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