Computer Hardware User Manual

Chapter 4: AMI BIOS

4-5

C1 Conﬁ guration Mode (*Available when supported by the CPU.)

Select Standard to enable the C1 Halt State to partially turn off the CPU internal

clocks to conserve energy and prevent system overheating when the OS is idle.

Select Enhanced to enable the Enhanced C1 Halt State to lower the CPU clock

frequency and the supply voltage before turning off the clocks.

IDE Conﬁ guration Sub-Menu

When this sub-menu is selected, the AMI BIOS automatically displays the follow-

ing items:

IDE Conﬁ guration

This feature allows the user to conﬁ gure the IDE mode. The options are

Disabled, P-ATA (Parallel ATA) only, S-ATA (Serial ATA) only and P-ATA & S-

ATA.

Combined Mode Operation

This feature allows the user to select the IDE Combined Mode. The options

are P-ATA 1st Channel and S-ATA 1st Channel.

S-ATA Ports Deﬁ nition

This feature allows the user to conﬁ gure the Serial ATA Ports. The options are

P0-Master/P1-Slave and P0-Slave/P1-Master

Primary IDE Channel Master/Slave, Secondary IDE Channel Master/

Slave

These settings allow the user to set the parameters of Primary IDE Channel

Master/Slave and Secondary IDE Channel Master/Slave slots. Hit <Enter> to

activate the following sub-menu screen for detailed options of these items. Set

the correct conﬁ gurations accordingly. The items included in the sub-menu are:

Type

Select the type of device connected to the system. The options are Not Installed,

Auto, CDROM and ARMD.

LBA/Large Mode

LBA (Logical Block Addressing) is a method of addressing data on a disk drive.

In the LBA mode, the maximum drive capacity is 137 GB. For drive capacities

over 137 GB, your system must be equipped with a 48-bit LBA mode addressing.

If not, contact your manufacturer or install an ATA/133 IDE controller card that

supports 48-bit LBA mode. The options are Disabled and Auto.

Block (Multi-Sector Transfer)

Block Mode boosts the IDE drive performance by increasing the amount of data

transferred. Only 512 bytes of data can be transferred per interrupt if Block Mode

is not used. Block Mode allows transfers of up to 64 KB per interrupt. Select

"Disabled" to allow the data to be transferred from and to the device one sec-

tor at a time. Select "Auto" to allows the data transfer from and to the device

occur multiple sectors at a time if the device supports it. The options are Auto

and Disabled.