Seagate ST373405LW Product Manual - Page 36
s 7 and 8. Locate the typical I/O rate for a drive in your system on the horizontal axis
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26 Cheetah 73LP Product Manual, Rev. C ST336605 For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.6 watts (29.4 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.9 watts (30.4 BTUs per hour). To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 7 and 8). 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. Amperes 1.000 0.900 0.800 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000 0 14 13 12 11 10 9 8 50 100 150 200 250 I/Os per Second Figure 9. ST336605 DC current and power vs. input/output operations per second (SE) 5V A 12V A Watts Watts 1.800 1.600 1.400 1.200 17 Amperes 1.000 15 0.800 13 0.600 11 0.400 0 50 100 150 200 I/Os per Second Figure 10. ST336605 DC current and power vs. input/output operations per second (LVD) 5V A 12V A Watts Watts