Seagate ST336705LW/LC, ST318405LW/LC, ST39205LW/LC manual Power dissipation ST336705

28 Cheetah 36XL Product Manual, Rev. E

6.3Power dissipation

ST336705

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 9.6 watts (32.8 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 9.6 watts (32.8 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 9). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the correspond- ing +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

	1.2									16
	1.0									14
										12
Amperes	0.8									10
	0.6									8
	0.4									6
										4
	0.2									2
	0.0									0
	4	6	11	16	24	33	45	82	121	151

I/Os per Second

5V A

12V A Watts

Watts

Figure 9. ST336705 DC current and power vs. input/output operations per second