Environmental limits, Wet bulb temperature

3.9Environmental 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).

3.9.1Temperature a. Operating

To obtain optimal performance, drives should be run at nominal case temperatures.

With cooling designed to maintain the case temperatures, the drive meets all specifications over a 41°F to 140°F (5°C to 60°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 these temperatures not exceeded. Air flow may be needed to achieve these temperature values. Operation at case temperatures above these val- ues 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 140°F (60°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 104°F (40°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 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.

3.9.2Humidity

3.9.2.1Relative humidity

Operating:	5% to 90% noncondensing (30% per hour max)

Nonoperating:	5% to 95% noncondensing (30% per hour max)

3.9.2.2Wet bulb temperature

Operating:	37.7°C	(99.9°F max)

Nonoperating:	40.0°C	(104.0°F max)

3.9.3Altitude

Operating:	–60.96 m to 3,048 m (–200 ft. to 10,000+ ft.)

Nonoperating:	–60.96 m to 12,192 m (–200 ft. to 40,000+ ft.)

Seagate ST32000644NS Environmental limits, Temperature a. Operating, Humidity Relative humidity