User`s manual
4-6
H8DMU+ User’s Manual
32-Bit Data Transfer
Select "Enabled" to activate the function of 32-Bit data transfer. Select "Dis-
abled" to deactivate the function. The options are Enabled and Disabled.
Serial ATA0/1/2 Primary/Secondary Channel
Highlight one of the items above and press <Enter> to access the sub-
menu for that item. If a drive is present, information on that drive will be
displayed here.
LBA/Large Mode
LBA (Logical Block Addressing) is a method of addressing data on a disk
drive. 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 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
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 al-
low 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.
DMA Mode
Selects the DMA Mode. Options are Auto, SWDMA0, SWDMA1, SWDMA2,
MWDMA0. MDWDMA1, MWDMA2, UDMA0. UDMA1, UDMA2, UDMA3,
UDMA4 and UDMA5. (SWDMA=Single Word DMA, MWDMA=Multi Word
DMA, UDMA=UltraDMA.)