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Barracuda 1 and 2 Product Manual, Rev. C
7.3
7.4
7.4.1
7.4.2
Heat/power dissipation
The heat and power dissipation values for the Barracuda 1 and 2 drives are
listed below.
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 stan-
dard 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
ST11950N/W
ST11950ND
ST12550N/W
ST12550ND
16W
18W
(55 BTUs/hr)
(62 BTUs/hr)
15W
15W
(51 BTUs/hr)
(51 BTUs/hr)
35
ST11950WD
ST12550WD
17W
(58 BTUs/hr)
15W
(51 BTUs/hr)
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