But now it does not read it correctly. In Disk Management the drive shows up as a dynamic disk. I did some reading and it seems that the Windows 7 machine will only read it as a Basic disk.

MBR2GPT.exe will convert a Windows 11/10 computer from legacy BIOS to UEFI disk partitioning. Convert a disk from MBR to GPT partition style.

I have modified MBR from 0x42 to 0x07 in windows 7 to convert dynamic to Basic disk i.e. 0000001C0 01 00 42 to 0000001C0 01 00 07 and now my system is not booting up it is just showing only c ...

Learn how to convert MBR to GPT disk without data loss in Windows 11/10, using Diskpart, Gptgen, or AOMEI Partition Assistant. MBR disks support only 4 partition tables.