Acer Power Sx Service Manual page 40

Parameter
Hard Disk Block Mode
Hard Disk 32-bit Access
Advanced PIO Mode
DMA Transfer Mode
32
Description
This function enhances disk performance depending
on the hard disk in use. If you set this parameter to
Auto, the BIOS utility automatically detects if the
installed hard disk drive supports the Block Mode
function. If supported, it allows data transfer in blocks
(multiple sectors) at a rate of 256 bytes per cycle.
Enabling this parameter improves system
performance by allowing the use of the 32-bit hard
disk access. This enhanced IDE feature works only
under DOS, Windows 3.x, Windows 95/98, Windows
NT, and Novell NetWare.
When set to Auto, the BIOS utility automatically
detects if the installed hard disk supports the function,
it allows for faster data recovery and read/ write
timing that reduces hard disk activity time. This
results in better hard disk performance.
The Ultra DMA and Multi-DMA modes enhance hard
disk performance by increasing the transfer rate.
However, besides enabling these features in the
BIOS Setup, both the Ultra DMA and Multi-DMA
modes require the DMA driver to be loaded.
Options
Auto or Disabled
Enabled or Disabled
Auto, Mode 0, 1, 2, 3 or 4
Auto
Multiword Mode 0, 1, 2
Ultra Mode 0, 1, 2, 3, 4
Disabled
Chapter 2