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#11
Storage Spaces do not include RAID0 functionality, only JBOD-like (but it is possible to create Striped Volume - RAID0 equivalent - directly in Disk Management console). Two-way mirror over two physical disks mentioned by me is - in the sense of data redundancy - similar to common RAID1. (But more complex in other aspects, for example possibility of underprovisioning.)
To regain access to data at volumes in upgraded pool, he can:
- install higher Windows 10 version on the same computer, or
- connect physical disks to different computer with higher Windows 10 version.
But he asked if there is some possibility to downgrade pool without destroying it, not how to gain access to data; he knows how to do it.
Storage Spaces are relatively complex structure, migrated from Windows Server realm, not suitable for average users.