Seagate ST3500071FC, ST3400071FC manual Power dissipation

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 27