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28 Cheetah 15K.7 FC Product Manual, Rev. C
450GB models
Typical power dissipation under idle conditions in 4 Gbit operation is 10.24 watts (34.94 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
4). 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 5. ST3450857FC DC current and power vs. input/output operations per second