Acer Altos 500 Series User Manual page 53

Advanced PIO Mode
When set to Auto, the BIOS utility automatically detects if the installed hard disk
supports the function. If supported, it allows for faster data recovery and
read/write timing that reduces hard disk activity time. This results in better hard
disk performance. To disregard the feature, change the setting to Disabled. The
default setting is
Hard Disk 32-Bit Access
Enabling this parameter improves system performance by allowing the use of 32-
bit hard disk access. This enhanced IDE feature works only under DOS,
Windows 3.x, Windows 95, and Novell NetWare. If your software or hard disk
does not support this function, set this parameter to Disabled. The default setting
is Enabled.
DMA Transfer Mode
The Ultra DMA and Multi-DMA modes enhance hard disk performance by
increasing the transfer rate. However, in addition to enabling these features in the
BIOS Setup, both the Ultra DMA and Multi-DMA modes require the DMA driver
to be loaded. By setting this parameter to Auto, BIOS automatically sets the
appropriate DMA mode for your hard disk. The default setting is Auto.
This parameter appears only when you are in the Advanced Level.
CD-ROM Drive DMA Mode
Set this parameter to Enabled to enable the DMA mode for the CD-ROM drive.
This improves system performance since it allows direct memory access to the CD-
ROM. To deactivate the function, set the parameter to Disabled . The default
setting is Disabled.
Chapter 2 - BIOS Utility 2-15