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24 Barracuda 180 Product Manual, Rev. A
6.3 Power dissipation
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 9.95 watts
(33.98 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.3
watts (35.18 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see fig-
ures 6 and 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corre-
sponding +5 volt current, +12 volts current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
Figure 6. DC current and power vs. input/output operations per second (single-ended mode)
Figure 7. DC current and power vs. input/output operations per second (LVD mode)
0.400
0 50 100
I/Os per Second
Amperes
150 200
0.600
0.800
1.000
1.200
11
13
Watts
15
17
1.400
1.800
1.600
5V A
12V A
Watts
0 50 100
I/Os per Second
Amperes
150 200
0.400
0.600
0.800
1.000
Watts
11
13
15
17
1.200
1.800
1.600
1.400
5V A
12V A
Watts