I am using a Dell Latitude D610 with a 120GB hard drive and have successfully created a dual boot drive with XP and Vista and neither OS sees the other. I am creating this post so that others may know how I did it and be able to do it themselves. This is only for Windows as I am not familiar with other OSes. Using Disk Director Suite v.10.0.1260 BOTH XP AND VISTA SHOULD ONLY BE INSTALLED ON PRIMARY ACTIVE PARTITIONS IF YOU WANT THEM TO WORK PROPERLY. 1. If you do not have XP installed go to step 4, 2. If you have XP installed, install DDS10 including OS Selector. After DDS10 is installed create a rescue disk on CD, you will need it later. 3. Using a good partition manager program (i.e. Disk Director, Partition Magic, etc.) create a new PRIMARY partition (preferably NTFS) to install Vista on. 4. If you are starting with a clean drive create 2 PRIMARY partitions (preferably NTFS) to install XP and Vista on. Install XP first, then install DDS10 including OS Selector, and create a recue disk. 5. Reboot system and OS Selector with come up with an XP icon. 6. Insert the Vista DVD and you will get an icon that says “Windows/CD” (I will refer to this as Vista DVD). 7. Right click on the Vista DVD icon and choose Properties. 8. Under Properties choose the Partition option. 9. Under Partition choose the XP partition and choose the Hidden option. 10. Choose the partition that you want to install Vista to and choose the Active option. 11. Click Apply and OK. 12. Right click on the Vista DVD icon and choose boot (don’t forget to press a key!). 13. Go through the normal Vista install. Vista will reboot and then finish installing. Once you have completed the install and are looking at the Vista desktop put the Acronis Rescue Disk into the drive and reboot the system. 14. The Acronis Rescue Disk will boot and you will need to choose Activate OS Selector. 15. Once OS Selector says that it has successfully activated remove rescue disk and click OK. OS Selector will now start and you will have two icons (XP and Vista). 16. Right click on the XP icon and choose Properties. 17. Under Properties choose the Partition option. 18. Click on the Vista partition and choose Hidden. Click on the partition that has XP and ensure that the Active box is checked. Click Apply and OK. 19. Right click on the Vista icon and choose Properties. 20. Under Properties choose the Partition option. 21. Click on the XP partition and ensure that the Hidden box is checked. Click on the Vista partition and ensure that the Active box is checked. Click Apply and OK 22. Click on the XP icon. XP will boot. Click on My Computer and you should see only one hard drive. Reboot system. 23. Click on the Vista icon. Vista will boot and you should not see the Vista Boot Menu. Click on My Computer and you should see only one hard drive. 24. If you have followed these directions you will have dual boot drive that has XP and Vista and you will not see either OS in the other. Hope this helps everybody and saves you a lot of headaches.