Asus P4B - Manual (Page 76)

4-12 Chapter 4: BIOS Setup
SMART Monitoring [Disabled]
This field allows you to enable or disable the S.M.A.R.T. (Self-Monitoring,
Analysis and Reporting Technology) system that utilizes internal hard disk
drive monitoring technology. This parameter is normally disabled because
the resources used in the SMART monitoring feature may decrease
system performance. Configuration options: [Disabled] [Enabled]
PIO Mode [4]
This option lets you set a PIO (Programmed Input/Output) mode for the
IDE device. Modes 0 through 4 provide successive increase in
performance. Configuration options: [0] [1] [2] [3] [4]
Ultra DMA Mode [Disabled]
Ultra DMA capability allows improved transfer speeds and data integrity for
compatible IDE devices. Set to [Disabled] to suppress Ultra DMA
capability. To make changes to this field, set the Type field to [User Type
HDD]. Configuration options: [0] [1] [2] [3] [4] [5] [Disabled]