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20 CONSTELLATION ES.3 SERIAL ATA PRODUCT MANUAL, REV. A
2.7 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).
2.7.1 Temperature
a. Operating
The drive meets the operating specifications over a 41°F to 140°F (5°C to 60°C) drive case temperature range with a maximum
temperature gradient of 36°F (20°C) per hour.
The maximum allowable drive case temperature is 60°C. See Figure 9 for HDA case temperature measurement location
The MTBF specification for the drive assumes the operating environment is designed to maintain nominal case temperature. The
rated MTBF is based upon a sustained case temperature of 104°F (40°C). Occasional excursions in operating temperature between the
rated MTBF temperature and the maximum drive operating case temperature may occur without impact to the rated MTBF
temperature.
However, continual or sustained operation at case temperatures beyond the rated MTBF temperature will degrade the
drive MTBF and reduce product reliability.
Air flow may be required to achieve consistent nominal case temperature values (see Section 3.4). To confirm that the required
cooling is provided for the electronics and HDA, place the drive in its final mechanical configuration, and perform random write/read
operations. After the temperatures stabilize, measure the case temperature of the drive.
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.
HDA Temp.
Check Point
Figure 9. Location of the HDA temperature check point
2.7.2 Humidity
2.7.2.1 Relative humidity
Operating: 5% to 90% noncondensing (30% per hour max)
Nonoperating: 5% to 95% noncondensing (30% per hour max)
2.7.3 Altitude
Operating: –304.8 m to 3048 m (–1000 ft. to 10,000+ ft.)
Nonoperating: –304.8 m to 12,192 m (–1000 ft. to 40,000+ ft.)
2.7.4 Shock
All shock specifications assume that the drive is mounted securely with the input shock applied at the drive mounting screws. Shock may
be applied in the X, Y or Z axis.
NOTE
Image is for reference only, may not represent actual drive