Figure 9. St336605 Dc Current And Power Vs. Input/Output Operations Per Second (Se); Figure 10. St336605 Dc Current And Power Vs. Input/Output Operations Per Second (Lvd) - Seagate ST373405LW - Cheetah 73.4 GB Hard Drive Product Manual

26
ST336605
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.6 watts
(29.4 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.9
watts (30.4 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.
1.000
0.900
0.800
0.700
0.600
0.500
0.400
0.300
0.200
0.100
0.000
0
Figure 9. ST336605 DC current and power vs. input/output operations per second (SE)
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
0
Figure 10. ST336605 DC current and power vs. input/output operations per second (LVD)
50 100
I/Os per Second
50 100
I/Os per Second
Cheetah 73LP Product Manual, Rev. C
150 200
150 200
5V A
14
12V A
13
Watts
12
11
10
Watts
9
8
250
5V A
12V A
Watts
17
15
13
Watts
11