User`s manual

4-12
X8DTH-6/X8DTH-6F/X8DTH-i/X8DTH-iF User's Manual
Block (Multi-Sector Transfer)
Block Mode boosts the IDE drive performance by increasing the amount of data
transferred. Only 512 bytes of data can be transferred per interrupt if Block Mode
is not used. Block Mode allows transfers of up to 64 KB per interrupt. Select
Disabled to allow data to be transferred to and from devices one sector at a time.
Select Auto to allow data transfer to and from the devices occur multiple sectors
at a time if the devices supports it. The options are Auto and Disabled.
PIO Mode
The IDE PIO (Programmable I/O) Mode programs timing cycles between the
IDE drive and the programmable IDE controller. As the PIO mode increases, the
cycle time decreases. The options are Auto, 0, 1, 2, 3, and 4.
Select Auto to allow the AMI BIOS to automatically detect the PIO mode. Use
this value if the IDE disk drive support cannot be determined.
Select 0 ~ 4 to allow the AMI BIOS to use PIO mode 0 ~ 4. It has a data transfer
rate of 3.3 MB/s ~ 16.6 MB/s. See the table below.
PIO Mode Select Options
Option Selected PIO Mode Max. Transfer Rate
0 PIO Mode 0 3.3 MB/s
1 PIO Mode 1 5.2 MB/s
2 PIO Mode 2 8.3 MB/s
3 PIO Mode 3 11.1 MB/s
4 PIO Mode 4 16.6 MB/s
DMA Mode
Select Auto to allow the BIOS to automatically detect IDE DMA mode when the
IDE disk drive support cannot be determined. The options are Auto, SWDMAn,
MWDMAn, and UDMAn. See the table below for DMA Mode Select Options.
DMA Mode Select Options
Option Selected DMA Mode Max. Transfer Rate
SWDMA 0 Single-Word DMA 0 2.1 MB/s
SWDMA1 Single-Word DMA 1 4.2 MB/s
SWDMA 2 Single-Word DMA 2 8.3MB/s
MWDMA 0 Multi-Word DMA 0 4.2 MB/s
MWDMA1 Multi-Word DMA 1 13.3 MB/s
MWDMA 2 Multi-Word DMA 2 16.6 MB/s
UDMA 0 Ultra DMA 0 16.6 MB/s
UDMA 1 Ultra DMA 1 25 MB/s
UDMA 2 Ultra DMA 2 33.3 MB/s
UDMA 3 Ultra DMA 3 44.4 MB/s