Asus P7P55D-E PRO - Manual

ASUS P7P55D-E PRO Technical Updates 
J-Micron Controller [IDE Mode] (page 3-25)
Allows you to select the JMicron controller operating mode.
[Disabled]
Disables the controller.
[IDE Mode] Set to [IDE Mode] when you want to use the Serial ATA hard disk drives as
Parallel ATA physical storage devices.
ASUS P7P55D-E PRO Technical Updates
This is an information update for the user guide that came with your motherboard package.
IE534
The AHCI mode is not supported by the JMicron controller.