Seagate ST318418N Product Manual - Page 34
Barracuda 36ES2 Product Manual, Rev. B, Power dissipation, ST336938/ST318438
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24 Barracuda 36ES2 Product Manual, Rev. B 6.3 Power dissipation ST336938/ST318438 The drives typical power dissipation under idle conditions is 8.0 watts (27.3 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. 1.800 1.600 1.400 5V A 12V A 21.0 Watts 12.0 1.200 17.0 Amperes 1.000 0.800 15.0 Watts 13.0 0.600 11.0 0.400 0 50 100 I/Os per Second 9.0 150 Figure 4. ST336938/ST318438 DC current and power vs. input/output operations per second (LVD)
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