Asus M4N82 User Guide - Page 70
Storage Configuration, OnChip S-ATA Controller
UPC - 610839170197
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32Bit Data Transfer [Enabled] [Enabled] Sets the IDE 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. 3.4.2 Storage Configuration The Storage Configuration menu allows you to configure your storage devices. Select an item then press to display the submenu. Main Storage Configuration Onboard PCI IDE Controller OnChip S-ATA Controller SATA Mode select BIOS SETUP UTILITY [Enabled] [Enabled] [SATA Mode] DISABLED: disables the integrated IDE Controller. ENABLED: enables both Controllers. Onboard PCI IDE Controller [Enabled] [Enabled] Enables the onboard IDE controller. [Disabled] Disables the onboard IDE controller. OnChip S-ATA Controller [Enabled] [Enabled] Enables the onboard SATA controller. [Disabled] Disables the onboard SATA controller. SATA Mode select [SATA Mode] This item appears only when you enabled the OnChip S-ATA Controller item and allows you to select the SATA mode. [SATA Mode] [RAID Mode] [AHCI Mode] Set to [SATA Mode] (or [IDE Mode], depending on the BIOS version) when you want to use the Serial ATA hard disk drives as Serial ATA physical storage devices. Set to [RAID Mode] when you want to create a RAID configuration from the SATA hard disk drives. Set to [AHCI] mode when you want the SATA hard disk drives to use the AHCI (Advanced Host Controller Interface). The AHCI allows the onboard storage driver to enable advanced Serial ATA features that increases storage performance on random workloads by allowing the drive to internally optimize the order of commands. When this item is set to [AHCI], only SATA connectors 1-4 can be detected. Ensure that you've installed the AHCI driver, so that you could use SATA connectors 1-5 and E-SATA connector in AHCI mode under OS. Chapter 3 3-10 Chapter 3: BIOS setup