DFI PT631-IPM - Manual (Page 62)

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BIOS Setup
SATA#1 IDE Configuration and SATA#2 IDE Configuration
These fields are used to configure the SATA device mode.
SATA#1 IDE Configuration
The options are Compatible and Enhanced.
SATA#2 IDE Configuration
The options are Disabled and Enhanced.
Compatible
Legacy IDE channels will appear allowing you to configure the devices.
Enhanced
”Configure SATA as” will appear allowing you to configure the devices.