AHCI - is the native sata mode.
- supports hot plugging (add/remove component while the computer is running) and some faster indexing
To be able to take advantage of the sata hot-plug your motherboard or sata controller must also be sata hotplug capable ( not all are ).
If it is, and it is activated from BIOS you will see the Safely Remove Hardware icon on the system tray, and your hard drive will be listed there.
RAID - is AHCI mode plus vendor specific raid configurations
Although windows vista or later has AHCI support will not load the driver at start-up if the os was installed in IDE mode, but can be installed in windows after booting in IDE mode.
AHCI support exists in Windows Vista, 7 and 8.
Windows Xp only supports IDE mode natively at boot but you can add a sata/raid driver via the F6 boot option or after the os is installed.
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