Seagate ST336807FC manual Power dissipation

6.3Power dissipation

ST336807FC

Typical power dissipation under idle conditions is 8.38 watts (28.60 BTUs per hour) during 1 Gbit operation. Typical power dissipation under idle conditions is 8.68 watts (29.62 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 4). 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.

		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	50.0	100.0	150.0	200.0	250.0	300.0
				I/Os per Second

		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	50.0	100.0	150.0	200.0	250.0	300.0
				I/Os per Second

Figure 4. ST336807FC DC current and power vs. input/output operations per second

28 Cheetah 10K.7 36GB FC Product Manual, Rev. A