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Primary/Secondary IDE Master/Slave
Highlight one of the items above and press <Enter> to access the submenu for
that item.
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 of
over 137 GB, your system must be equipped with 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 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.
PIO Mode
PIO (Programmable I/O) mode programs timing cycles between the IDE drive
and the programmable IDE controller. As the PIO mode increases, the cycle time
decreases. The options are Auto, 0, 1, 2, 3, and 4. Select Auto to allow AMI
BIOS to auto detect the PIO mode. Use this value if the IDE disk drive support
cannot be determined. Select 0 to allow AMI BIOS to use PIO mode 0. It has a
data transfer rate of 3.3 MBs. Select 1 to allow AMI BIOS to use PIO mode 1.
It has a data transfer rate of 5.2 MBs. Select 2 to allow AMI BIOS to use PIO
mode 2. It has a data transfer rate of 8.3 MBs. Select 3 to allow AMI BIOS to
use PIO mode 3. It has a data transfer rate of 11.1 MBs. Select 4 to allow AMI
BIOS to use PIO mode 4. It has a data transfer rate of 16.6 MBs. This setting
generally works with all hard disk drives manufactured after 1999. For other disk
drives, such as IDE CD-ROM drives, check the specifi cations of the drive.
7-3
Chapter 7: BIOS
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