For those of as with AMD SB600 south bridge OSx86 is easier to setup, when SATA controller is in AHCI mode (the installer sees all SATA HDD's and you can partition and choose any as install location)
But if you wanna dual boot with Windows XP (like I am) and have previously installed XP with SATA controller in IDE mode - it's like pain in the @$$ - you have to enter BIOS setup each time you want to switch OSes and change SATA controller mode from AHCI to IDE or vise versa.
So I dig and have found a nice and easy solution:

1.Boot XP in IDE mode.
2.Copy "ahci8086.sys" file from attached driver package to "C:\Windows\System32\Drivers".
3.Right-click on "AHCI-InstallXP32.reg" file and choose Merge
4.Reboot, enter BIOS setup and enable AHCI mode, save and reboot. Boot Windows and have fun.

Original information obtained from german forum: "http://62.109.81.232/cgi-bin/sbb/sbb.cgi?&a=show&forum=2&show=2290"