You can use NIUBI Partition Editor Free Edition to convert Dynamic Disk to Basic without losing data on Windows 11/10. All features discussed.

i have a dynamic disk that needs to be converted back to a basic disk. i can right click it in disk manager, but revert to basic disk is greyed out. how do i convert it?

Windows 2003 server boots just fine from dynamic disks, but I think you should show us a screenshot of your Disk Managament MMC so we can be sure you're not accidentally spanning the volume.

Fix Windows cannot be installed to this hard disk space, The partition contains one or more dynamic volumes that are not supported for installation.