Power Dissipation; Figure 6. Dc Current And Power Vs. Input/Output Operations Per Second (Single-Ended Mode); Figure 7. Dc Current And Power Vs. Input/Output Operations Per Second (Lvd Mode) - Seagate ST173404LW Product Manual

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6.3

Power dissipation

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 16.1 watts (55
BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
16.36 watts (55.8 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see fig-
ures 6 and 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corre-
sponding +5 volt current, +12 volts current, and total watts on the vertical axis. To caluclate BTUs per hour,
multiply watts by 3.4123.
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
0
Figure 6. DC current and power vs. input/output operations per second (single-ended mode)
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
0
Figure 7. DC current and power vs. input/output operations per second (LVD mode)
50 100
I/Os per Second
50 100
I/Os per Second
Cheetah 73 Product Manual, Rev. D
22
20
Watts
18
16
150 200
22
20
Watts
18
16
150 200
5V A
12V A
Watts
5V A
12V A
Watts