Did you try going here?: Go to Start > Settings > System > Storage > Advanced storage settings > Storage spaces
Is this what you are trying to do?:
Storage Spaces helps protect your data from drive failures and extend storage over time as you add drives to your PC. You can use Storage Spaces to group two or more drives together in a storage pool and then use capacity from that pool to create virtual drives called storage spaces. These storage spaces typically store two copies of your data so if one of your drives fails, you still have an intact copy of your data. If you run low on capacity, just add more drives to the storage pool.
How to create a storage space:
I believe these are the old control panel directions:
- Add or connect the drives that you want to group together with Storage Spaces.
- Go to the taskbar, type Storage Spaces in the search box, and select Storage Spaces from the list of search results.
- Select Create a new pool and storage space.
- Select the drives you want to add to the new storage space, and then select Create pool.
- Give the drive a name and letter, and then choose a layout. Two-way mirror, Three-way mirror, and Parity can help protect the files in the storage space from drive failure.
- Enter the maximum size the storage space can reach, and then select Create storage space.
Being that I rely on Microsoft 365, I have never created this type of storage space so someone else may be able to help better.