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Seagate Terascale HDD Product Manual, Rev. B 12
www.seagate.com
2.8 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).
2.8.1 Ambient 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 3 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 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.
Figure 3 Location of the HDA temperature check point
2.8.2 Humidity
2.8.2.1 Relative humidity
Note
The recommended storage period:
• 1 year under controlled conditions of 34°C 90%RH or less
• 90 days in uncontrolled storage conditions
Note
Image is for reference only, may not represent actual drive
Operating 5% to 90% non-condensing (30% per hour max)
Nonoperating 5% to 95% non-condensing (30% per hour max)
HDA Temp.
Check Point