I googled Diskpart and I found an article that explained what to do. I was able to convert disk 1 to GPT and then create a new volume in disk management. Now I have full access to my entire 8 TB hard drive.
3 Free MBR to GPT Converter for Windows 11/10/8/7 (No Data Loss)
2. Free change MBR disk to GPT via Diskpart (Data Loss)
Similar to Disk Management, Diskpart is also a Windows built-in tool for users to manage their disk partition. It also only supports converting an empty disk to GPT, so you need to delete all volumes on disk before using this free MBR to GPT converter.
. Press Win+R
together on your keyboard, type cmd in the Run
dialogue and press Enter
to open Command Prompt window.
. In the Command Prompt windows, type diskpart
and hit on Enter
to launch the Diskpart tool. Then run the following commands in turn and press Enter after each one.
•select disk #
After that, you can type "exit" and press Enter to close this window. Then you can see it is converted to be GPT style in Disk Management.