Specifications

Hawk 2XL Product Manual, Rev. B 21
6.3 Power dissipation
For drives with single ended interface circuits, typical operating random read power dissipation is 7.5 watts
(25.6 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle condi-
tions is 6.0 watts (20.5 BTUs per hour).
6.4 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).
6.4.1 Temperature
a. Operating
The drive meets all specifications over a 41°F to 131°F (5°C to 55°C) drive ambient temperature range with
a maximum temperature 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 3, column 1 are not exceeded. Air flow may
be needed to achieve these temperature values. Operation at case temperatures [4] 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 55°C or 5°C may occur without impact to specified
MTBF. To achieve the specified MTBF, the values of Table 3, column 2 must be considered maximum
average operating case temperatures. Air flow may be needed to achieve these temperatures. See Section
8.3. Continual or sustained operation at case temperatures above these values may degrade MTBF.
Table 3: Temperatures PCB and HDA (see Figure 4)
Note.
[1] The temperatures shown in Column 2 were measured on an unmounted drive lying on its side during ran-
dom write/reads at 100% duty cycle in still air.
[2] The temperatures in Column 1 are calculated and may not reflect actual operating values. Sufficient cool-
ing air may be required to ensure that these values are not exceeded.
[3] Measure HDA temp at point labeled “HDA” on Figure 4.
[4] PCB mounted Integrated circuit case.
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 spec-
ification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
Items
in
Figure
4
Component
on
PCB
Number
Column 1
Maximum Case [4]
Temperatures (°C)
Operating (55° Ambient) [2]
Column 2
Typical Case [4]
Temperatures (°C)
at 35°C Ambient [1]
HDA [3] 65 45
U2 1,2,3 91 63
U4 1,2,3 98 52
U5 1,2,3 84 57
U13 1,2,3 96 53
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