DFI EL330-DR - Manual (Page 72)

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BIOS Setup
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.
IDE Primary Master/Slave UDMA and IDE Secondary Master/
Slave UDMA
These fields allow you to set the Ultra DMA in use. When Auto is
selected, the BIOS will select the best available option after checking
your hard drive or CD-ROM.
Auto The BIOS will automatically detect the settings for
you.
Disabled The BIOS will not detect these categories.
On-Chip Secondary PCI IDE
This field is used to enable or disable the secondary IDE controller.
The default is Enabled. Select Disabled if you want to add a different
hard drive controller.