Power Dissipation; Figure 2. Dc Current And Power Vs. Input/Output Operations Per Second (1 Gbit); Figure 3. Dc Current And Power Vs. Input/Output Operations Per Second (2 Gbit) - Seagate ST3400071FC Product Manual

6.3

Power dissipation

Typical power dissipation under idle conditions is 10.49 watts (35.79 BTUs per hour) during 1 Gbit operation.
Typical power dissipation under idle conditions is 10.75 watts (36.68 BTUs per hour) during 2 Gbit operation.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
2). 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.
ST3500001FC DC CURRENT/POWER vs THROUGHPUT (1Gb) Random 8 Block Reads
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.200
0.000
0.0 20.0 40.0
Figure 2. DC current and power vs. input/output operations per second (1 Gbit)
ST3500001FC DC CURRENT/POWER vs THROUGHPUT (2Gb) Random 8 Block Reads
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.200
0.000
0.0 20.0 40.0
Figure 3. DC current and power vs. input/output operations per second (2 Gbit)
NL35 Series FC Product Manual, Rev. D
60.0 80.0 1 00.0 1 20.0
I/Os per Second
60.0 80.0 1 00.0 1 20.0
I/Os per Second
1 8.00
1 6.00
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
2.00
0.00
1 40.0 1 60.0 1 80.0
1 8.00
1 6.00
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
2.00
0.00
1 40.0 1 60.0 1 80.0
5Vo lt A
1 2 Volt A
Watts
5Vo lt A
1 2 Volt A
Watts
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