Dell PowerEdge C6145 Hardware Owner's Manual page 61

Option
OnChip SATA Channel
(Enabled default)
OnChip SATA Type
(Native IDE default)
SATA IDE Combined Mode
(Enabled default)
Hard Disk Write Protect
(Disabled default)
Description
Select this item to enable or disable Onboard SATA
controller.
Native IDE: Native mode.
AMD_AHCI: Use
IDE->AMD_AHCI: No AHCI option ROM, use
AMD AHCI driver (need load driver when install OS,
windows 2008 R2 had native support.)
RAID: Use RAID option ROM.
Two SATA (Port 4 and Port 5) share one IDE channel
(could be either Primary or Secondary channel) from
IDE (PATA) controller.
Select this item to disable/enable device write
protection. This will be effective only if device is
accessed through BIOS.
Using the System Setup Program | 61
AMD AHCI option ROM.