Asus P5MT-C - Manual (Page 72)

4-16 Chapter 4: BIOS setup
If the Onboard IDE Operate Mode is set to [Compatible], you can only
use the SATA2, SATA4, and P-ATA connectors.
Enhanced Mode Support On [S-ATA]
The default setting SATA allows you to use native OS on Serial ATA
and Parallel ATA ports. We recommend that you do not change the
default setting for better OS compatibility. In this setting, you may
use legacy OS on the Parallel ATA ports only if you did not install any
Serial ATA device.
The S-ATA+P-ATA and P-ATA options are for advanced users only. If
you set to any of these options and encounter problems, revert to the
default setting SATA. Configuration options: [S-ATA+P-ATA]
[S-ATA] [P-ATA]
The Onboard IDE Operate Mode and its submenu items appear only when
the Configure SATA As item is set to Standard IDE.
Onboard Serial-ATA BOOTROM [Disabled]
Enables or disables the onboard Serial ATA boot ROM.
Configuration options: [Disabled] [Enabled]
The Onboard Serial-ATA BOOTROM item appears only when the Configure
SATA As item is set to RAID.
ALPE and ASP [Disabled]
Enables or disables the ALPE and ASP.
Configuration options: [Disabled] [Enabled]
Stagger Spinup Support [Disabled]
Enables or disables the stagger spinup support.
Configuration options: [Disabled] [Enabled]
AHCI Port 3 Interlock Switch [Disabled]
Enables or disables the Advanced Host Controller Interface (AHCI)
Port 3 interlock switch. Configuration options: [Disabled] [Enabled]
The ALPE and ASP item appears only when the Configure SATA As item
is set to AHCI.
IDE Detect Time Out [35]
Selects the time out value for detecting ATA/ATAPI devices.
Configuration options: [0] [5] [10] [15] [20] [25] [30] [35]