pauls3743 :
Congratulations, you have successfully posted in a thread that is over a year old.
Several years later, and there are still people coming here to find solutions by reading posts, even if those posts are more than a year after the original post. I have found late posts with better, newer, more updated information more helpful, even. So, here is my problem. How do I delete the volume and convert to GPT when I only have one disk 0 which contains the operating system? It does not allow me to delete the unallocated volume which shows to the right of the primary volume which has my OS on it. I cannot convert the drive to GPT because I cannot delete the unallocated volume, ot os not even offered as an option. Extend and shrink are grayed out in the menu and "convert to GPT" is not even an option on the menus on any volume on my "disk 0." I do not have any disks beyond "disk 0" and I have noticed that all these deleting ov folumes and convertings to GPT seem to always be done on the "disk 1" and higher, rather than on "disk 0" which, in all instances I have observed on these boards and uoutube videos, has the oiperating system. My problem, I think, is that I want to use my full 3T drive and I have no toher hard drive and thus, it must be allocated properly (converted as well to GPT) DURING windows installation, but I am unable to control volume creation during installation, this seems to be something not allowed even in custom installation. Any help on this for folks who only have a "disk 0" showing up in disk management?