6.3Power 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

 

 

 

 

 

 

 

 

18.00

5Volt A

 

 

 

 

 

 

 

 

 

 

 

 

1.600

 

 

 

 

 

 

 

 

16.00

12 Volt A

 

 

 

 

 

 

 

 

 

Watts

 

 

 

 

 

 

 

 

 

 

 

 

1.400

 

 

 

 

 

 

 

 

14.00

 

 

1.200

 

 

 

 

 

 

 

 

12.00

Power (watts)

Amperes

1.000

 

 

 

 

 

 

 

 

10.00

0.800

 

 

 

 

 

 

 

 

8.00

0.600

 

 

 

 

 

 

 

 

6.00

 

 

 

 

 

 

 

 

 

 

 

0.400

 

 

 

 

 

 

 

 

4.00

 

 

0.200

 

 

 

 

 

 

 

 

2.00

 

 

0.000

 

 

 

 

 

 

 

 

0.00

 

 

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

180.0

 

 

 

 

 

 

I/Os per Second

 

 

 

 

 

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

 

 

 

 

 

 

 

 

18.00

5Volt A

 

 

 

 

 

 

 

 

 

 

 

 

1.600

 

 

 

 

 

 

 

 

16.00

12 Volt A

 

 

 

 

 

 

 

 

 

Watts

 

 

 

 

 

 

 

 

 

 

 

 

1.400

 

 

 

 

 

 

 

 

14.00

 

 

1.200

 

 

 

 

 

 

 

 

12.00

Power (watts)

Amperes

1.000

 

 

 

 

 

 

 

 

10.00

0.800

 

 

 

 

 

 

 

 

8.00

0.600

 

 

 

 

 

 

 

 

6.00

 

 

 

 

 

 

 

 

 

 

 

0.400

 

 

 

 

 

 

 

 

4.00

 

 

0.200

 

 

 

 

 

 

 

 

2.00

 

 

0.000

 

 

 

 

 

 

 

 

0.00

 

 

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

180.0

 

 

 

 

 

 

I/Os per Second

 

 

 

 

 

Figure 3. DC current and power vs. input/output operations per second (2 Gbit)

NL35 Series FC Product Manual, Rev. D

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Seagate ST3500071FC, ST3400071FC manual Power dissipation