Seagate ST336607FC manual Power dissipation ST3146807FC, ST373307FC

24 Cheetah 10K.6 FC Product Manual, Rev. B

6.3Power dissipation

ST3146807FC

Typical power dissipation under idle conditions is 10.72 watts (37.3 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 9). 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.

ST3146807FC DC CURRENT/POWER vs THROUGHPUT (2 Gb)

Random 8 Block Reads

	1.800					18.00
	1.600					16.00
	1.400					14.00
Amperes	1.200					12.00
	1.000					10.00
	0.800					8.00
	0.600					6.00
	0.400					4.00
	0.0	50.0	100.0	150.0	200.0	250.0

I/Os per Second

5Volt A 12 Volt A

Watts

Power (watts)

Figure 9. ST3146807FC DC current and power vs. input/output operations per second

Note. Values shown are for operation at 2Gb, for operation at 1Gb, reduce the +5V by.10 amps. The +12V current values are not affected by loop speed.

ST373307FC

Typical power dissipation under idle conditions is 8.99 watts (30.7 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 9). 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.

ST373307 FC CURRENT/POWER vs THROUGHPUT (2 gig)

Random 8 Block Reads

	1.800						18.00
	1.600						16.00
	1.400						14.00
Amperes	1.200						12.00
	1.000						10.00
	0.800						8.00
	0.600						6.00
	0.400						4.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0

I/Os per Second

5Vo lt A

12 Vo lt A Watts

Power (watts)

Figure 10. ST373307FC DC current and power vs. input/output operations per second

Note. Values shown are for operation at 2Gb, for operation at 1Gb, reduce the +5V by.10Amps. The +12V current values are not affected by loop speed.