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Cheetah NS FC Product Manual, Rev. B
6.3 Power dissipation
ST3400755FC
Typical power dissipation under idle conditions in 4 Gbit operation is 8.1 watts (27.64 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
3). 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.
Figure 3. ST3400755FC DC current and power vs. input/output operations per second at 4 Gbit
ST3400755 CURRENT/POWER vs THROUGHPUT (FC - 4GB)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1. 0 00
1. 2 00
1. 4 00
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10 . 00
12 . 00
14 . 00
Power (watts)
5Volt A
12 V o l t A
Watts