Thread: What is ACHI
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Old June 29, 2010, 09:52 AM
upcoast604 upcoast604 is offline
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Advanced Host Controller Interface - Wikipedia, the free encyclopedia

Many SATA controllers offer selectable modes of operation: legacy Parallel ATA emulation, standard AHCI mode, or vendor-specific RAID. Intel recommends choosing RAID mode on their motherboards (which also enables AHCI) rather than the plain AHCI/SATA mode for maximum flexibility, due to the issues caused when the mode is switched once an operating system has already been installed.[2] Legacy mode is a software backward-compatibility mechanism intended to allow the SATA controller to run in legacy operating systems which are not SATA-aware or where a driver does not exist to make the operating systems SATA-aware.


I've wondered this too. I was just looking at a bios yesterday thinking what would happen if I switched it to raid or ACHI with an OS already installed.
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