TYAN Tiger i7320 User Manual page 33

Tiger i7320 S5350
drives are no longer specified in terms of classical geometry, but rather in terms of their total
number of user data sectors and addressed using LBA.
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.
Because the Ultra DMA protocol is designed to work with legacy application PIO and DMA
protocols, it can be added to many existing computers by installing an Ultra DMA/33
Peripheral Component Interconnect adapter card. Ultra DMA uses the same 40-pin Integrated
Drive Electronics interface cable as PIO and DMA.
Disabled / Mode 0 / Mode 1 / Mode 2
3-5
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Chapter 3: BIOS Setup