Temperature - Seagate ST12400N Product Manual

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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 is needed to
achieve these temperature values. Operation at case temperatures above these values may adversely affect
the drive's ability to meet specifications.
The MTBF specification for the drive is based on operating at an ambient temperature of 95°F (35°C) with no
air flow. 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 considered
maximum average operating case temperatures. Continual or sustained operation at case temperatures
above the values shown in Column 2 may degrade MTBF.
Items
in
Figure
7.4.1-1
HDA
U2
U8
Q2
Q13
Note.
[1] The temperatures in Column 2 were measurements made in an enclosed box with no air flow at a pressure
of one atmosphere with random seeks.
[2] No point on the top of the HDA shall exceed this temperature.
[3] Ambient temperature is measured at the side of the drive 0.25" (6.4 mm) from the case. Airflow is 3.5 cfm,
min.
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 speci-
fication assumes that the drive is packaged in the shipping container designed by Seagate for use with the
drive.
Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. E
Table 7.4.1-1. PCB and HDA temperatures
Column 1
Maximum Case
Temperatures (°C)
Operating 50°C Ambient[3]
60 [2]
80
65
64
72
Column 2
Typical Case
Temperatures (°C)
at 35°C Ambient[1]
56
72
50
63
67