Tyan Computer TOLEDO S5520 - Manual (Page 36)

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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.
Options: 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.
Options: 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.
Options: Disabled / Mode 0 / Mode 1 / Mode 2 / Mode 5