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X6DVA-4G2/X6DVA-EG2 User's Manual
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 address-
ing. 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 sector 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
The IDE 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 AMIBIOS to automatically detect the PIO mode. Use this value if the
IDE disk drive support cannot be determined. Select 0 to allow AMIBIOS to use
PIO mode 0. It has a data transfer rate of 3.3 MBs. Select 1 to allow AMIBIOS
to use PIO mode 1. It has a data transfer rate of 5.2 MBs. Select 2 to allow
AMIBIOS to use PIO mode 2. It has a data transfer rate of 8.3 MBs. Select 3
to allow AMIBIOS to use PIO mode 3. It has a data transfer rate of 11.1 MBs.
Select 4 to allow AMIBIOS 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.
DMA Mode
Select Auto to allow the BIOS to auto detect the DMA mode. Use this value if
the IDE disk drive support cannot be determined. Select SWDMA0 to allow the
BIOS to use Single Word DMA mode 0. It has a data transfer rate of 2.1 MBs.
Select SWDMA1 to allow the BIOS to use Single Word DMA mode 1. It has a
data transfer rate of 4.2 MBs. Select SWDMA2 to allow the BIOS to use Single
Word DMA mode 2. It has a data transfer rate of 8.3 MBs. Select MWDMA0 to
allow the BIOS to use Multi Word DMA mode 0. It has a data transfer rate of
4.2 MBs. Select MWDMA1 to allow the BIOS to use Multi Word DMA mode 1.
It has a data transfer rate of 13.3 MBs. Select MWDMA2 to allow the BIOS to
use Multi-Word DMA mode 2. It has a data transfer rate of 16.6 MBs. Select
UDMA0 to allow the BIOS to use Ultra DMA mode 0. It has a data transfer
4-6
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