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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 86°F (30°C).
6.4.1
Temperature
a. Operating
With cooling designed to maintain the case temperature, the drive meets all specifications over a 41°F to
131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C)
per hour. The enclosure for the drive should be designed such that the temperature at the location specified
in Note [3] is not exceeded. Air flow may be needed to achieve these temperature values (see Note [1]).
Operation at case temperatures above these values may adversely affect the drives ability to meet specifi-
cations.
The MTBF specification for the drive is based on operating in an environment that ensures that the case
temperature is not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or
41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera-
tures (see Note [1]). The maximum allowable continuous or sustained temperature for rated MTBF is 113°F
(45°C).
To confirm that the required cooling for the drive is provided, place the drive in its final mechanical configu-
ration, perform random write/read operations. After the temperatures stabilize, measure the case tempera-
ture of the HDA (see Note [3]).
The maximum allowable HDA case temperature is 50°C. Operation of the drive at the maximum case tem-
perature is intended for short time periods only. Continuous operation at the elevated temperatures will
reduce product reliability.
Notes.
[1]
Section 8.2.1 describes the air-flow patterns to be used to meet HDA temperature. Air flow was oppo-
site that shown in Section 8.2.1. Air velocity should be adequate to ensure that the HDA temperature is
not exceeded during drive operation.
[2]
The temperatures in columns 1 and 2 are calculated and may not reflect actual operating values. Suf-
ficient cooling is required to ensure that these values are not exceeded.
[3]
Measure HDA temp at point labeled "HDA Temp. Check Point" on Figure 6.
b. Non-operating
–40° to 163°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
HDA Temperature
Figure 6.
Location of HDA Temperature Check Point
Check Point
Barracuda 36ES2 Product Manual, Rev. B
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