Dell C6145 manual Function for that port will not work

Option	Description
(Disabled default)	protection. This will be effective only if device is
	accessed through BIOS.
IDE Detect Time Out(Sec)	Select the time out value for detecting ATA/ATAPI
(35 Sec. default)	device(s).
Power Saving Features	Disables/Enables power saving features in SB. As
(Disabled default)	general rule, this feature should be disabled for
	desktop and enabled for mobile.
SATA-IDE Ports Auto Clk	When this option is enabled, the system shuts down
Ctrl	the clocks for unused SATA ports in IDE. This enables
(Disabled default)	some power savings.
	Note: When users shut down the clocks, the hot-plug
	function for that port will not work.
SATA-AHCI Ports Auto Clk	When this option is enabled, the system shuts down
Ctrl	the clocks for unused SATA ports in AHCI modes.
(Disabled default)	This enables some power savings.
	Note: When users shut down the clocks, the hot-plug
	function for that port will not work.

Using the System Setup Program 41