Troubleshooting GPT Protective Partitio…
https://www.seagate.com/support/kb/troubleshooting-gpt-protective-partition-issues-207837en/
Look for the drive that is identified as GPT and note the Disk number (such as Disk 1). Click Start and type "diskmgmt.msc" in the Start search box. Right-click diskmgmt.msc and click Run as Administrator. In Disk Management, right-click the disk and choose “Initialize Disk”. Choose MBR or GPT in the pop-out window and click “OK”. Right-click on (My) Computer. Choose Manage. Select Disk Management (listed under Storage). Click Start, type diskmgmt.msc in the Start search box.
Click Start and type "diskmgmt.msc" in the Start search box.
Right-click diskmgmt.msc and click Run as Administrator.
In Disk Management, right-click the disk and choose “Initialize Disk”.
Choose MBR or GPT in the pop-out window and click “OK”.
Right-click on (My) Computer.
Choose Manage.
Select Disk Management (listed under Storage).
Click Start, type diskmgmt.msc in the Start search box.
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