Supermicro H8SCM-F User Manual download pdf (Page 55)

Chapter 4: BIOS

4-7

Primary/Secondary/Third/Fourth IDE Master/Slave

LBA/Large Mode

LBA (Logical Block Addressing) is a method of addressing data on a disk

drive. The options are Disabled and Auto.

Block (Multi-Sector Transfer)

Block mode boosts 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 the data to be transferred from and to the device

one sector at a time. Select "Auto" to allows the data transfer from and to the

device occur multiple sectors at a time if the device supports it. The options

are Auto and Disabled.

PIO Mode

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 BIOS to auto

detect the PIO mode. Use this value if the IDE disk drive support cannot be

determined. Select 0 to allow BIOS to use PIO mode 0, which has a data

transfer rate of 3.3 MBs. Select 1 to allow BIOS to use PIO mode 1, which

has a data transfer rate of 5.2 MBs. Select 2 to allow BIOS to use PIO mode

2, which has a data transfer rate of 8.3 MBs. Select 3 to allow BIOS to use

PIO mode 3, which has a data transfer rate of 11.1 MBs. Select 4 to allow

BIOS to use PIO mode 4, which has a data transfer rate of 16.6 MBs. This

setting generally works with all hard disk drives manufactured after 1999.

For other disk drives, such as IDE CD-ROM drives, check the speciﬁ cations

of the drive.

DMA Mode

Selects the DMA Mode. Options are Auto, SWDMA0, SWDMA1, SWDMA2,

MWDMA0. MDWDMA1, MWDMA2, UDMA0. UDMA1, UDMA2, UDMA3,

UDMA4 and UDMA5. (SWDMA=Single Word DMA, MWDMA=Multi Word

DMA, UDMA=UltraDMA.)

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Supermicro H8SCM-F User Manual Page 55