Seagate ST11200N - 7.4 Environmental Limits

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
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7.4 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).
7.4.1 Temperature
a. Operating
The drive meets all specifications over a 41°F to 122°F (5°C to 50°C) drive ambient temperature range
with a maximum gradient of 36°F (20°C) per hour. The enclosure for the drive should be designed such
that the temperatures at the locations specified in Table 7.4.1-1, column 1 are not exceeded. Air flow
may be needed to achieve these temperature values. Operation at case temperatures above these
values may adversely affect the drives ability to meet specifications.
The MTBF specification for the drive is based on operating at an ambient temperature of 95°F (35°C).
Occasional excursions to drive ambient temperatures of 50°C or 5°C may occur without impact to
specified MTBF. To achieve the specified MTBF, the values of Table 7.4.1-1 Column 2 must be consid-
ered maximum average operating case temperatures. Air flow may be needed to achieve these tem-
peratures. Continual or sustained operation at case temperatures above these values may degrade
MTBF.
Table 7.4.1-1. PCB and HDA temperatures
Items Column 1 Column 2
in Maximum Case Typical Case
Figure Temperatures (
o
C) Temperatures (
o
C)
7.4.1-1 Operating at 35°C Ambient
HDA 60 49
U1 78 65
U3 80 67
U5 68 55
U6 72 58
VR1 63 50
U7 (Differential) 70 54
Note: The temperatures in Column 2 were measurements made with an air flow of 1 ft/sec through the
drive at a pressure of one atmosphere.
b. Non-Operating
-40° to 158°F (-40° to 70°C) package ambient with a maximum gradient of 45°F (25°C) per hour.
This specification assumes that the drive is packaged in the shipping container designed by Seagate
for use with the drive.
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