DFI G5C100-NR - Manual (Page 82)

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BIOS Setup
IDE HDD Block Mode
Enabled The IDE HDD uses the block mode. The system BIOS
will check the hard disk drive for the maximum block
size the system can transfer. The block size will depend
on the type of hard disk drive.
Disabled The IDE HDD uses the standard mode.
IDE DMA Transfer Access
This field is used to enable or disable the DMA transfer function of
an IDE hard drive.
On-Chip Primary PCI IDE and On-Chip Secondary PCI IDE
These fields allow you to enable or disable the primary and second-
ary IDE controller. The default is Enabled. Select Disabled if you want
to add a different hard drive controller.
IDE Primary Master/Slave PIO and IDE Secondary Master/Slave
PIO
PIO means Programmed Input/Output. Rather than have the BIOS
issue a series of commands to effect a transfer to or from the disk
drive, PIO allows the BIOS to tell the controller what it wants and
then let the controller and the CPU perform the complete task by
themselves. Your system supports five modes, 0 (default) to 4, which
primarily differ in timing. When Auto is selected, the BIOS will select
the best available mode after checking your drive.
Auto The BIOS will automatically set the system according
to your hard disk drive’s timing.
Mode 0-4 You can select a mode that matches your hard disk
drive’s timing. Caution: Do not use the wrong setting
or you will have drive errors.