Asus M2N-SLI - Manual (Page 88)

4-28 Chapter 4: BIOS setup
SATA Port 1, 2[Enabled]
Allows to disable or enable OnChip SATA(Port 1, Port 2)
Configuration options: [Disabled] [Enabled]
SATA DMA transfer [Enabled]
Allows to disable or enable to switch to support SATA DMA tranfer
Configuration options: [Disabled] [Enabled]
SATA Port 3, 4[Enabled]
Allows to disable or enable OnChip SATA2(Port 3, Port 4)
Configuration options: [Disabled] [Enabled]
SATA2 DMA transfer [Enabled]
Allows to disable or enable to switch to support SATA2 DMA tranfer
Configuration options: [Disabled] [Enabled]
IDE Prefetch Mode[Enabled]
Allows to disable or enable IDE PIO read prefetch mode. When prefetch is
enabled, either 16-bit or 32-bit are allowed on IDE bus.
Configuration options: [Disabled] [Enabled]