Abit KG7-RAID User Manual page 49

Introducing the BIOS
" Master Drive UltraDMA:
Ultra DMA is a DMA data transfer protocol that utilizes ATA commands and the ATA bus to allow
DMA commands to transfer data at a maximum burst rate of 66 MB/sec.
!Auto:
When you select Auto, the system automatically determines the optimal data transfer rate
for each IDE device. (Default)
!Disabled: If you encounter the problem of using Ultra DMA devices, you can try to Disable this
item.
" Slave Drive UltraDMA:
!Auto:
When you select Auto, the system automatically determines the optimal data transfer rate
for each IDE device. (Default)
!Disabled: If you encounter the problem of using Ultra DMA devices, you can try to Disabled this
item.
Onboard IDE-2 Controller:
The onboard IDE 2 controller can be set as Enabled or Disabled. Description is the same as the item
"Onboard IDE-1 Controller", you can refer the above description.
PIO MODE 0 ~ 4 reflects the IDE device data transfer rate. The higher the MODE value is, the better is
the IDE device data transfer rate. But it does not mean that you can select the highest MODE value just as
you like, you first have to be sure that your IDE device supports this MODE, otherwise the hard disk will
not be able to operate normally.
IDE Prefetch Mode:
Two options are available: Disabled or Enabled. The default setting is Enabled. The onboard IDE drive
interfaces supports IDE prefetching, for faster drive accesses. If you install a primary and/or secondary
add-in IDE interface, set this field to Disabled if the interface does not support prefetching.
Init Display First:
Two options are available: PCI Slot or AGP. The default setting is PCI Slot. When you install more than
one display cards, you can choose either a PCI display card (PCI Slot) or an AGP display card (AGP) to
activate the display boot-up screen. If you only installed one display card, the BIOS will detect which slot
(AGP or PCI) you installed it, in then everything will be take care of by the BIOS.
Onboard USB Controller:
Two options are available: Disabled or Enabled. The default setting is Enabled. This should be enabled if
your system has a USB installed on the system board and you wish to use it. Even when so equipped, if
you add a higher performance controller, you will need to disable this feature. If you choose disable this
item, the "USB Keyboard Support" item will disappear in Chipset Features Setup menu.
" USB Keyboard Support:
Two options are available: OS and BIOS. The default setting is OS. If your operating system supports
a USB keyboard, please set it to OS. Only in some situations, such as in a pure DOS environment that
does not support a USB keyboard, should you set it to BIOS.
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User's Manual