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26 | Barracuda 36ES2 Product Manual, Rev. B |
6.4Environmental 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).
6.4.1Temperature
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
[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.
HDA Temperature
Check Point
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