Seagate Cheetah 18LP, Product Manual, Page: 33 / 94

Cheetah 18LP Product Manual, Rev. F 23
6.3 Power dissipation
ST318203
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.65 watts
(36.3 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
10.75 watts (36.7 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curves. Locate the
typical I/O rate for a drive in your system on the horizontal axis and read the corresp5 volt current, +12
volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 7. ST318203 DC current and power vs. input/output operations per second (SE)
Figure 8. ST318203 DC current and power vs. input/output operations per second (LVD)
0.4
0 50 100
I/Os per Second
Amperes
150 200 250
0.6
0.8
1
1.2
11
13
Watts
15
17
1.4
1.8
1.6
5V A
12V A
Watts
0.4
0 50 100
I/Os per Second
Amperes
150 200 250
0.6
0.8
1
1.2
11
13
Watts
15
17
1.4
1.8
1.6
5V A
12V A
Watts