Power Dissipation; Figure 7. St336706 Dc Current And Power Vs. Input/Output Operations Per Second - Seagate ST336706LW Product Manual

Cheetah 36ES Product Manual, Rev. A
6.3

Power dissipation

ST336706
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 12.4 watts
(42.31 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 12.4
watts (42.31 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the correspond-
ing +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply
watts by 3.4123.
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4
Figure 7. ST336706 DC current and power vs. input/output operations per second
6 11 16 24
I/Os per Second
34 46 84 126
18
5V A
16
12V A
14
Watts
12
10
8
6
Watts
4
2
0
202
27