TYAN S5393 Manual page 35

This option allows you to specify the number of sectors per block for multiple sector
transfers.
Disabled/ 2 Sectors / 4 Sectors / 8 Sectors / 16 Sectors
LBA Mode Control
Enables or disables LBA Mode.
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.
Disabled / Enabled
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.
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 /
Mode 6
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