Power Dissipation; Figure 7. St373405Fc Dc Current And Power Vs. Input/Output Operations Per Second; Figure 8. St336605Fc Dc Current And Power Vs. Input/Output Operations Per Second - Seagate Cheetah ST336605FC/FCV Product Manual

Cheetah 73LP FC Product Manual, Rev. D
6.3

Power dissipation

ST373405FC
Typical power dissipation under idle conditions is 11.3 watts (38.6 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
Figure 7. ST373405FC DC current and power vs. input/output operations per second
ST336605FC
Typical power dissipation under idle conditions is 9.6 watts (32.8 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
Figure 8. ST336605FC DC current and power vs. input/output operations per second
0 50
I/Os per Second
0 50 100
I/Os per Second
100 150
150 200
5V A
12V A
Watts
17
15
Watts
13
11
200
5V A
12V A
Watts
17
15
Watts
13
11
250
23