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I'm experimenting with converting an EMBR disk to GPT.

If only one partition on my EMBR disk contains a Windows 10 system, chgdtype correctly converts the disk to GPT.

If two partitions are Windows 10 systems, chgdtype displays Closing disk... Complete followed by Converting disk partitioning fron EMBR to GPT and never completes.

what's on the partitions? What is the partition layout (partinfo listing), you can send a request to support with the details and we can check.