Figure 9. St39204 Dc Current And Power Vs. Input/Output Operations Per Second (Se); Figure 10. St39204 Dc Current And Power Vs. Input/Output Operations Per Second (Lvd) - Seagate ST318404LW Product Manual

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ST39204
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 7.0 watts
(23.8 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 7.0
watts (23.8 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 9 and 10). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor-
responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
Figure 9. ST39204 DC current and power vs. input/output operations per second (SE)
Figure 10. ST39204 DC current and power vs. input/output operations per second (LVD)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 50
I/Os per Second
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 50
I/Os per Second
Cheetah 18XL Product Manual, Rev. A
100 150
100 150
5V A
12V A
5V A
12V A