Possible values of an option:
[Enhanced AHCI], [Enhanced Non-AHCI], [Combined], [Serial ATA Only], [Parallel ATA Only]
The option description:
As a matter of fact, unites in itself two options: similar [Onboard IDE Operate Mode] and similar [Configure SATA As]. At value [Enhanced AHCI] the standard IDE/SATA-controler of a chipset will work in an enhanced mode and, besides, to support all innovations of expanded host controler SATA II (AHCI it is decrypted Advanced Host Controller Interface). Value [Non-AHCI] also translates the controler in an enhanced mode, but AHCI is not supported any more.
Three remained variants translate the standard IDE/SATA-controler of a chipset in a compatible mode. At a choice [Parallel ATA Only] the drives connected to IDE-channels, setting [Serial ATA Only] will be visible only makes accessible exceptional drives connected to channels SATA, and [Combined] allows to use as IDE – and SATA-stores.
Advantage of expanded host controler AHCI consists in usage of queue of commands, possibilities hot etc. should not be forgotten connection and about higher high-speed performance of a disk subsystem in this mode.
Windows 95, Windows 98, Windows Me, simply "do not know" that IDE – and SATA-channels in the total there can be more than two. For normal operation of these operating systems it is necessary to use a compatible mode. In it the operating system "sees" or two standard IDE-channels, or one IDE-channel and one "pseudo-IDE", made of two SATA, or, even, two "pseudo-IDE", made of four SATA. In Windows 2000, Windows XP and Windows Vista such problems are not present, they can work normally with any amount of IDE/SATA-channels. Therefore for them the enhanced mode doing accessible all channels of the IDE/SATA-controler of a chipset quite approaches, how many them was.