Figure 13. St39133 Dc Current And Power Vs. Input/Output Operations Per Second (Se); Figure 14. St39133 Dc Current And Power Vs. Input/Output Operations Per Second (Lvd) - Seagate ST318203LW Product Manual

26
ST39133
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 9.4 watts (32
BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 9.8
watts (33.4 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 7 and 8). 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.
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Figure 13. ST39133 DC current and power vs. input/output operations per second (SE)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Figure 14. ST39133 DC current and power vs. input/output operations per second (LVD)
50 100
I/Os per Second
50 100
I/Os per Second
Cheetah 18LP Product Manual, Rev. F
150 200
150 200
5V A
12V A
22
Watts
20
18
16
Watts
14
12
250
5V A
12V A
22
Watts
20
18
16
Watts
14
12
250