Asus P1-AH1 - Manual (Page 72)

5-12 Chapter 5: BIOS setup
UDMA Mode [Auto]
Ultra DMA capability allows improved transfer speeds and data integrity for
compatible IDE devices. Set to [Disabled] to suppress Ultra DMA
capability. Configuration options: [Disable] [Auto]
5.3.4 HDD SMART Monitoring [Disabled]
This option allows you to enable or disable the HDD SMART Monitoring
function. Configuration options: [Disabled] [Enabled]
5.3.5 Installed Memory [xxx MB]
This field automatically displays the amount of conventional memory
detected by the system during the boot process. This item is not
user-configurable.
5.3.6 Usable Memory [xxx MB]
This field automatically displays the Usable Memory detected by the
system during the boot process. This item is not user-configurable.