Asus PCH-DL - Manual (Page 66)

4-8 Chapter 4: BIOS Setup
Access Mode [Auto]
Allows selection of the sector addressing mode. The default [Auto] allows
automatic detection of an IDE drive. Set this item to [CHS] if the Primary
IDE Master item is set to [Manual] so you can manually enter the drive
values. Configuration options: [CHS] [LBA] [Large] [Auto]
PIO Mode [Auto]
Sets the PIO mode for the IDE drive. The settings Mode 0 to 4 allow
successive increase in performance. Configuration options: [Auto]
[Mode 0] [Mode 1] [Mode 2] [Mode 3] [Mode 4]
UDMA Mode [Auto]
When this item is set to [Auto], the UDMA capability allows improved
transfer speeds and data integrity for supported IDE drives. Configuration
options: [Disabled] [Auto]