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CONSTELLATION ES.1 SAS PRODUCT MANUAL, REV. G 31
6.5 E
NVIRONMENTAL 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).
6.5.1 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 tem-
perature gradient of 36°F (20°C) per hour.
The maximum allowable drive case temperature is 60°C. See Figure 10 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. 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 10.2). To confirm that the required cool-
ing is provided for the electronics and HDA, place the drive in its final mechanical configuration, and perform random write/read opera-
tions. 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 10. Location of the HDA temperature check point
Note. Image is for reference only, may not represent actual drive.
6.5.2 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.
6.5.3 Effective altitude (sea level)
a. Operating
–200 to +10,000 feet (–61 to +3,048 meters)
b. Non-operating
–200 to +40,000 feet (–61 to +12,210 meters)
6.5.4 Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is installed in an enclosure to
which the stated shock and/or vibration criteria is applied, resonances may occur internally to the enclosure resulting in drive movement in
excess of the stated limits. If this situation is apparent, it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted by any of the four methods shown in
Figure 11, and in accordance with the restrictions of Section 10.3.