Asus M4A87TD EVO - Manual (Page 55)

Chapter 2: BIOS setup 2-9
Block (Multi-Sector Transfer) M [Auto]
[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] Sets 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 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.
2.4.2 Storage Configuration
The Storage Configuration menu allows you to configure your storage devices. Select an item
then press <Enter> to display the submenu.
OnChip SATA Channel [Enabled]
[Enabled] Enables the onboard channel SATA port.
[Disabled] Disables the onboard channel SATA port.
The following two items appear only when you set the OnChip SATA Channel item to
[Enabled].