Seagate ST318452LC Manual download pdf (Page 37)

Cheetah X15 36LP Product Manual, Rev. D 27

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

With cooling designed to maintain the case temperatures, 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 temperatures are not exceeded. Air

flow may be needed to achieve these temperature values (see Section 8.3). Operation at case tempera-

tures above these values may adversely affect the drives ability to meet specifications.

The MTBF specification for the drive is based on operating in an environment that ensures that the case

temperatures are not exceeded. Occasional excursions to drive ambient temperatures of 122°F (50°C) or

41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera-

tures. Continual or sustained operation at case temperatures above these values may degrade MTBF. The

maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F (50°C)

To confirm that the required cooling for the electronics and HDA is provided, place the drive in its final

mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure

the HDA case temperature of the drive.

The maximum allowable HDA case temperature is 60°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.

b. Non-operating

–40° to 158°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.

Figure 10. Locations of the HDA temperature check point

6.4.2 Relative humidity

The values below assume that no condensation on the drive occurs.

a. Operating

5% to 95% non-condensing relative humidity with a maximum gradient of 20% per hour.

b. Non-operating

5% to 95% non-condensing relative humidity.

6.4.3 Effective altitude (sea level)

a. Operating

–1,000 to +10,000 feet (–305 to +3,048 meters)

HDA Temperature

Check Point

.5"

2.0"

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Seagate ST318452LC Manual Page 37