Hi William,
Thanks for your post. Before moving on, you can run the following Powershell command to see if there is some drives unpooled and the exact size of usage.
Get-PhysicalDisk | Format-Table FriendlyName,MediaType,Size,CanPool,CannotPoolReason
Reference: Storage Spaces and Storage Spaces Direct health and operational states | Microsoft Learn
Best Regards,
Ian Xue
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