Originally Posted by Notme
@mizaring
Thanks for the update for Intel ICH10 and I tested it on a new Asus M/B P5QL-E (Intel P43) with Seagate ST3500320AS for XP Pro SP3, it works!!
For those who want to know how to enable hard drive NCQ with AHCI which was the reason for me to use AHCI in the first place, according to the information on Seagate's web site, it is by default enabled, if you are using AHCI and it can not be changed by end user level as it is on the firmware level (for those HDDs support NCQ).
Thanks and hope this will help others too.
Thank you mizaring!!!

You've saved my day after trying many different things for several hours.
This works exactly as you posted.
Now I can enjoy my Ubuntu dual boot!
Respect!
MY mobo is ASUS P5Q PRO