IWILL P55XB2, Manual, Page: 82 / 91

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Disabled No IDE controller occupying a PCI slot.
Disabled is the default.
IDE PIO
IDE hard drive controllers can support up to two separate hard drives. These drives
have a master/slave relationship which are determined by the cabling configuration
used to attach them to the controller. Your system supports two IDE controllers--a
primary and a secondary--so you have to ability to install up to four separate hard
disks.
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. This simpler and more efficient (and faster).
Your system supports five modes, numbered from 0 (default) to 4, which primarily
differ in timing. When
Auto is selected, the BIOS will select the best available mode.
This is true for the next four setup items:
1. IDE Primary Master PIO
2. IDE Primary Slave PIO
3. IDE Secondary Master PIO
4. IDE Secondary Slave PIO
As stated above, your system includes two built-in IDE controllers, both of which
operate on the PCI bus. This setup item allows you either to enable or disable the
primary controller. You might choose to disable the controller if you were to add a
higher performance or specialized controller.
Enabled Primary HDD controller used -- Default
Disabled Primary HDD controller not used.
On-Chip Primary PCI
IDE