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"

Thanks martin953 for posting this. Also the solution for VISTA users on the same issue could be found here:
<a href="http://support.microsoft.com/kb/922976">Vista ahci fix</a>

i am going to post this on another site for other people to use

Thank You for the guide very usefull..

Firewalk

Thank you martin953 (& bhast2 for submitting), I added the solution here --->

http://mac.kbot.de/how-to-setup-sb600-windows-xp-and-vista-ahci-driver/

What about if you cannot change the mode? - My laptop has the SB600 south bridge but i cannot boot it either and my bios has no power or hdd configuration parts [manly has turn firewire off, turn serial off sort options]

Thanks

Can you identify what mode you have now?

Have vista atm, what program? Everest? - i'll have a look

Seems to be enabled, as much as i could find out

In device manager under SCSI controller you must have AMD AHCI controller installed and your disk drives must be shown as SCSI devices AFAIK.
If this true - then you have AHCI enabled.
If you are having trouble with boot form install DVD - first thing to do is to search on this forum and on insanelymac for posts about yours laptop.
Almost surely there must be some experience already. Good luck!