Seagate ST318405LW/LC, ST39205LW/LC Cheetah 36XL Product Manual, Rev. E ST318405, Os per Second

Cheetah 36XL Product Manual, Rev. E 29

ST318405

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.0 watts (27.3 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.0 watts (27.3 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 10). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corre- sponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, mul- tiply watts by 3.4123.

	1.2									14
											5V A
	1.0									12	12V A
											Watts
	0.8									10
Amperes
										8
	0.6
										6	Watts
	0.4									4
	0.2									2
	0.0									0
	4	6	11	16	24	33	45	82	122	155

I/Os per Second

Figure 10. ST318405 DC current and power vs. input/output operations per second