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Chapter 7: BIOS
7-15
contact your manufacturer or install an ATA/133 IDE controller card that supports
48-bit LBA mode. The options are Disabled and Auto .
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 supports transfers of up to 64 KB per interrupt. Select
Disabled to allow data to be transferred from and to the device one sector at a
time. Select Auto to allow data transfer from and to the device multiple sectors
at a time if the device 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 to allow the AMI BIOS to use PIO mode 0. It has a data transfer rate
of 3.3 MB/s.
Select 1 to allow the AMI BIOS to use PIO mode 1. It has a data transfer rate
of 5.2 MB/s.
Select 2 to allow the AMI BIOS to use PIO mode 2. It has a data transfer rate
of 8.3 MB/s.
Select 3 to allow the AMI BIOS to use PIO mode 3. It has a data transfer rate
of 11.1 MB/s.
Select 4 to allow the AMI BIOS to use PIO mode 4. It has a data transfer band-
width of 32-Bits. Select Enabled to enable 32-Bit data transfer.
Select UDMA5 to allow the BIOS to use Ultra DMA mode 5. It has a data transfer
rate of 133 MB/s.
Select UDMA6 to allow the BIOS to use Ultra DMA mode 6. It has a data transfer
rate of 133 MB/s. The options are Auto , SWDMAn, MWDMAn, and UDMAn.
DMA Mode
Select Auto to allow BIOS to automatically detect IDE DMA mode when IDE disk
drive support cannot be determined.
Select SWDMA0 to allow BIOS to use Single Word DMA mode 0. It has a data
transfer rate of 2.1 MB/s.
Select SWDMA1 to allow BIOS to use Single Word DMA mode 1. It has a data
transfer rate of 4.2 MB/s.