Seagate HAWK 4, Product Manual

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20 Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F
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Note. All times and currents are typical. See Table 7.2-1 for maximum current requirements.
Figure 7.2.2-1. Typical Hawk 4 family drive +5 V +12 V current profile
7.3 Heat/power dissipation
For drives with single ended interface circuits, typical operating power dissipation is 11 watts (37.7 BTUs per
hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 9 watts
(30.8 BTUs per hour).
For drives having differential interface circuits, typical operating power dissipation is 12 watts (41.1 BTUs per
hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 9.5 watts
(32.5 BTUs per hour).
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).
0 2 4 6 8
Seconds
10 12 14 16 18
.5
1
1.5
.5
1.0
5V
Current
(amps)
12V
Current
(amps)
CH2 GND
2.0
CH1 GND
T1 T2
T4
T5
Channel 1
2 s .5 Amps
Channel 2
2 s .5 Amps
T
20
T3 T6
Power Save
Cut-in