Seagate Barracuda ST318418N - Manual (Page 35)

Barracuda 36ES2 Product Manual, Rev. B 25
ST336918/ST318418
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 two I/O rate curves (see
Figures 5). 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.
Figure 5. ST336918/ST318418 DC current and power vs. input/output operations per second (SE)
1.800
0 50 100
I/Os per Second
Amperes
150
0.400
0.600
0.800
1.000
9.0
Watts
11.0
13.0
15.0
1.200
1.600
1.400
5V A
12V A
Watts
17.0
19.0
21.0