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When LBA is turned on, the BIOS will enable geometry translation. This
translation may be done in the same way that it is done in Extended CHS or
large mode, or it may be done using a different algorithm called LBA-assist
translation. The translated geometry is still what is presented to the operating
system for use in Int 13h calls. The difference between LBA and ECHS is that
when using ECHS the BIOS translates the parameters used by these calls from
the translated geometry to the drive's logical geometry. With LBA, it translates
from the translated geometry directly into a logical block (sector) number.
Disabled / Enabled
32 Bit I/O
Enables or disables 32 bit data transfer mode.
Enabling this option causes the PCI hard disk interface controller to bundle
together two 16-bit chunks of data from the drive into a 32-bit group, which is
then transmitted to the processor or memory. This results in a small
performance increase.
Enabled / Disabled
Transfer Mode
These modes determine the speed at which data is transferred to and from the
drive. The Auto option automatically determines the correct transfer rates.
Auto / Standard / Fast PIO 1 / Fast PIO 2 / Fast PIO 3 / Fast PIO 4 /
FPIO 3 / DMA 1 / FPIO 4 / DMA 2
Ultra DMA Mode
Enables or disables Ultra DMA Mode.
Ultra DMA (UDMA, or, more accurately, Ultra DMA/33) is a protocol for
transferring data between a hard disk drive through the computer's data paths
(or bus) to the computer's random access memory (RAM). The Ultra DMA/33
protocol transfers data in burst mode at a rate of 33.3 MBps (megabytes per
second), twice as fast as the previous Direct Memory Access (DMA) interface.
Ultra DMA support in your computer means that it will boot (start) and open new
applications more quickly. It will also help users of graphics-intensive and other
applications that require large amounts of access to data on the hard drive.
Ultra DMA uses Cyclical Redundancy Checking (CRC), offering a new level of
data protection.
Disabled / Mode 0 / Mode 1 / Mode 2 / Mode 3 / Mode 4 / Mode 5