Seagate ST15150N Product Manual - Page 46

Heat/power dissipation, Environmental limits

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36 7.3 7.4 7.4.1 7.4.2 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D Heat/power dissipation The heat and power dissipation values for your drive are listed below. Typical seek and read power dissipation of DC power average at nominal voltages ST15150N/W/WC ST15150ND/WD/DC 15W (51 BTUs/hr) 16W (54 BTUs/hr) Typical power dissipation under idle conditions 12W (41 BTUs/hr) 12W (41 BTUs/hr) Environmental limits Temperature and humidity must not cause condensation within the drive. 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). Temperature a. Operating The MTBF specification for the drive is based on operating at a local ambient temperature of 95°F (35°C). Occasional excursions to drive ambient temperatures of 122°F (50°C) may occur without impact to specified MTBF. The enclosure for the drive should be designed such that the temperatures at the locations specified in Figures 7, 8, 9, 10, 11, and 12 are not exceeded. Air flow may be needed to achieve these temperatures. Continual or sustained operation at case temperatures above these values may degrade MTBF. The drive meets all specifications within a 41° to 122°F (5° to 50°C) drive ambient temperature range with a maximum gradient of 36°F (20°C) per hour. b. Non-operating Non-operating temperature should remain between -40° to 158°F (-40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This assumes that the drive is packaged in the shipping container designed by Seagate. Relative humidity The values below assume that no condensation on the drive occurs. a. Operating 5% to 95% relative humidity with a maximum gradient of 10% per hour b. Non-operating 5% to 95% relative humidity

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36
ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
7.3
Heat/power dissipation
The heat and power dissipation values for your drive are listed below.
ST15150N/W/WC ST15150ND/WD/DC
Typical seek and read
15W
16W
power dissipation of DC power
(51 BTUs/hr)
(54 BTUs/hr)
average at nominal voltages
Typical power dissipation
12W
12W
under idle conditions
(41 BTUs/hr)
(41 BTUs/hr)
7.4
Environmental limits
Temperature and humidity must not cause condensation within the drive.
Altitude and atmospheric pressure specifications are referenced to a stan-
dard day at 58.7°F (14.8°C). Maximum wet bulb temperature is 82°F (28°C).
7.4.1
Temperature
a. Operating
The MTBF specification for the drive is based on operating at a local
ambient temperature of 95°F (35°C). Occasional excursions to drive
ambient temperatures of 122°F (50°C) may occur without impact to
specified MTBF. The enclosure for the drive should be designed such that
the temperatures at the locations specified in Figures 7, 8, 9, 10, 11, and
12 are not exceeded. Air flow may be needed to achieve these tempera-
tures. Continual or sustained operation at case temperatures above
these values may degrade MTBF.
The drive meets all specifications within a 41° to 122°F (5° to 50°C) drive
ambient temperature range with a maximum gradient of 36°F (20°C) per
hour.
b. Non-operating
Non-operating temperature should remain between –40° to 158°F (–40° to
70°C) package ambient with a maximum gradient of 36°F (20°C) per
hour. This assumes that the drive is packaged in the shipping container
designed by Seagate.
7.4.2
Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% relative humidity with a maximum gradient of 10% per hour
b. Non-operating
5% to 95% relative humidity