Asus P7P55 WS SUPERCOMPUTER - Manual (Page 76)

3-12 Chapter 3: BIOS setup
Block (Multi-Sector Transfer) M [Auto]
Enables or disables data multi-sectors transfers.
[Auto]
When set to [Auto], the data transfer from and to the device occurs
in multiple sectors at a time if the device supports multi-sector
transfer feature.
[Disabled] When set to [Disabled], the data transfer from and to the device
occurs one sector at a time.
PIO Mode [Auto]
[Auto] Allows automatic selection of the PIO (Programmed input/output)
modes, which correspond to different data transfer rates.
[0] [1] [2] [3] [4] Set the PIO mode to Mode 0, 1, 2, 3, or 4.
DMA Mode [Auto]
DMA (Direct Memory Access) allows your computer to transfer data to and from
the hardware devices installed with much less CPU overhead.
The DMA mode consists of SDMA (single-word DMA), MDMA (multi-word DMA),
and UDMA (Ultra DMA). Setting to [Auto] allows automatic selection of the DMA
mode.
SMART Monitoring [Auto]
[Auto] Allows automatic selection of the S.M.A.R.T (Smart Monitoring,
Analysis, and Reporting Technology).
[Enabled] Enables the S.M.A.R.T feature.
[Disabled] Disables the S.M.A.R.T feature.
32Bit Data Transfer [Enabled]
[Enabled] Sets the IDE/SATA controller to combine two 16-bit reads from the
hard disk into a single 32-bit double word transfer to the processor.
This makes more efficient use of the PCI bus as fewer transactions
are needed for the transfer of a particular amount of data.
[Disabled] Disables this function.