Seagate Barracuda ST318418N - Manual (Page 34)

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.
Figure 4. ST336938/ST318438 DC current and power vs. input/output operations per second (LVD)
1.800
0 50 100
I/Os per Second
Amperes
150
0.400
0.600
0.800
1.000
11.0
Watts
13.0
15.0
17.0
1.200
1.600
1.400
5V A
12V A
Watts
12.0
21.0
9.0