Product manual

24 Product Manual - Hawk 2 Family (Wide bus) SCSI-2 (Volume 1), Rev. C
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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 may
be 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.
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 50°C Ambient [3] at 35°C Ambient [1]
HDA 60 [2] 56
U2 80 72
U8 65 50
Q2 64 63
Q13 72 67
Notes.
[1] The temperatures in Column 2 were made in an enclosed box with no airflow 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. Air flow 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
specification assumes that the drive is packaged in the shipping container designed by Seagate for use
with the drive.